explain xkcd - User contributions [en]

Talk:2632: Greatest Scientist

2024-09-24T02:23:32Z

172.70.163.48: Undo revision 351028 by 42.book.addict (talk) Clearly a fully acknowledged redlink, there for illustrative purposes. I can see why OP is upset at your unasked-for changes.

If anyone knows how to get this to work with the bar at the top, please do it! [[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 18:32, 13 June 2022 (UTC)
:[[User:SqueakSquawk4]] for everything to display correctly I think you need to follow the steps here: [[User:DgbrtBOT#When_the_BOT_fails...]] [[User:Ahiijny|Ahiijny]] ([[User talk:Ahiijny|talk]]) 18:43, 13 June 2022 (UTC)
::A) Following them now. B) Bookmarked. [[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 18:45, 13 June 2022 (UTC)
:::Should be fixed now. [[User:Natg19|Natg19]] ([[User talk:Natg19|talk]]) 18:49, 13 June 2022 (UTC)

Saying Viviani already proved that the acceleration due to gravity on an object is independent of mass runs into a snag: Viviani suggest that it was Galileo who showed him that. So whether Galileo actually dropped any balls from the Tower of Pisa or was even the first to assert the principle in writing, he seems to be the driving force behind Vivian's proofs of it. Dismissing Galileo here is wrong. [[Special:Contributions/172.69.70.159|172.69.70.159]] 21:53, 13 June 2022 (UTC)

Thunderbolts and lightning, very, very frightening me. Galileo, Galileo, Galileo, Galileo, Galileo, Figaro.... [[Special:Contributions/162.158.159.41|162.158.159.41]] 23:22, 13 June 2022 (UTC)

He did this before in 1531, where he combines several principles into a single comic. [[Special:Contributions/108.162.245.31|108.162.245.31]] 23:39, 13 June 2022 (UTC)
:Hard to believe he's been doing these comics for nearly 500 years now. [[Special:Contributions/162.158.187.138|162.158.187.138]] 19:46, 14 June 2022 (UTC)

So many missed opportunities to include Focault's pendulum, cannonball mine drops, the Magnus and Coriolis effects, electromagnatism, etc, ad nauseam, ad astra [[Special:Contributions/108.162.221.193|108.162.221.193]] 13:57, 14 June 2022 (UTC)

;Pavlov was inhumane
Pavlov did a lot more than just ring some bells. For example (Trigger warning for dog lovers), he drained them of stomach acid until they were dead for profit alone, and sewed dogs heads onto each other. I think this should be acknowledges. I have put this in the main article, but it has been removes. I've tried re-phrasing, and want to know how well that will stick.
:What do you think should happen. I think it is important to acknowledge, but at the same time it is not directly relevant to the comic. Please discuss. [[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 23:16, 13 June 2022 (UTC)
::It was I who removed the first phrasing, and as it is written now I think it's good. Perhaps a trivia section would be appropriate for it, as someone else mentioned, and I saw no problem with having a link in the previous version. [[User:While False|While False]] ([[User talk:While False|speak]]) 09:19, 14 June 2022 (UTC)
:Seems most appropriate for a Trivia section and not the main article. [[Special:Contributions/172.70.211.52|172.70.211.52]]

;Two Petri dishes
The title text says that "''One'' of the petri dishes" fell (emphasis added). Is that an obscure reference to the {{w|Twin paradox}}?
:Proposed new text:
{| class="wikitable"
| (Title text) One of the petri dishes fell and one did not || The {{w|Twin paradox}} thought experiment: ... || See [[1432]] || {{w|Albert Einstein}}
|}
::No I think that is very far fetched. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 13:21, 14 June 2022 (UTC)
::: I have added it, with a "Possible" note next to it. (Or will have in a min)
::: Also, I assume you meant [[1584: Moments of Inspiration]], not [[1432: The Sake of Argument]].
::: Also Also, two Square brackets [ ] around an internal link, not two fancy/curly brackets {} [[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 11:23, 14 June 2022 (UTC)
::::I will remove it. There is not sign of twin paradox in that title text! --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 13:24, 14 June 2022 (UTC)
::::: Sorry. I'm such an imbecil for adding it. So so sorry. Is there something I can do to make up for it? I don't want to delete my account, but I would if you wanted. Edit: How about a compromise, where the Einstein theory is mentioned in brief under the table as far-fetched but possible? [[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 14:27, 14 June 2022 (UTC)
::::::The link to the twin paradox is that there are two Petri dishes and only one of them falls (rather than all of them) and that being bonked on the head "gives an idea". I think this should be included, and wouldn't mind a "possible" or "unlikely" or "far-fetched" qualifier. For that matter I wouldn't mind if the table literally said "This is absolutely definitely positively with a cherry on top not a reference to the {{w|Twin paradox}}" :) -OP
::::Thanks SS4. I meant the title text of 1432, which explains thought experiments (they also came up in [[1233]] but aren't explained there).
::::I used {} because I assumed that'd link to that comic with ''both'' its number and its title. -OP
:::::Quick list of these things, in case it helps.
:::::* Bare URLs are treated as literal links if recognisable (might fall over some URLs, best avoided when more complicated than https://www.microsoft.com) - and note the padlock icon in most cases.
:::::* Single []s are for URLs.
:::::** <code>[URL]</code> alone gives a 'reference number' link, not very viewer-friendly
:::::** <code>[URL TEXT]</code> (with a <space> between) gives the TEXT-as-link-to-URL format
:::::** Will include a 'padlock' icon on (most?) external sites
:::::** Using an explainxkcd URL (e.g. pointing at a page like an edit-diff one) doesn't add the padlock... May be possible to link to those with [[]], below, but I find it simpler to do it this way, when necessary.
:::::* Double [[]]s are best used for internal links
:::::** <code><nowiki>[[PAGE_TITLE]]</nowiki></code> (need not use underscore for spaces, but can) links in the form you write...
:::::** <code><nowiki>[[PAGE_TITLE|TEXT]]</nowiki></code> gives you the choice of using alternate text.
:::::** Because of page-redirects, often a <code><nowiki>[[COMIC_NUMBER]]</nowiki></code> or a <code><nowiki>[[COMIC_TITLE]]</nowiki></code> will work and send you to the right <code><nowiki>[[COMIC_NUMBER:_COMIC_TITLE]]</nowiki></code>, but it's good practice to use the latter because some comics are titled with numbers, etc, and if you're not giving substituted link-text it's convention to link (e.g.) [[2632: Greatest Scientist]] visibly explicit like that... ;)
:::::* {{}} is for invoking Templates
:::::** Some are unqualified, like <code><nowiki>{{Citation needed}}</nowiki></code>
:::::** But <code><nowiki>{{TEMPLATE|OPTIONS|...}}</nowiki></code> is common. e.g.:
:::::*** <code><nowiki>{{w|Valid Wikipedia Page Title}}</nowiki></code> or,
:::::*** <code><nowiki>{{w|Valid Wikipedia Page Title#AndSubsection|Text to link with}}</nowiki></code> (that goes, in this case, directly to a subheadered sectio... if valid
:::::*** You ''could'' invoke http://www.wikipedia.org/wiki/Padlock or [http://www.wikipedia.org/wiki/Padlock] or [http://www.wikipedia.org/wiki/Padlock Padlock] or even [[Padlock]] (if that last one were available locally, which it isn't!), but {{w|Padlock}} or {{w|Padlock#Symbolism|the symbolism of a padlock}} just works better and simpler!
:::::** Other useful templated shortcuts to external sites are {{template|tvtropes}} (a wiki-in-spirit) and {{template|wiktionary}}, that require the 'page title' as first parameter and any text-to-link-as optional second. Note that because {{tvtropes|TVTropesWillRuinYourLife}}, the TVTropes-linking template is set up to visually warn the possibly compulsive [[214: The Problem with Wikipedia|wikiwalker]] that they may get sucked in and ''does'' retain the padlock... ;)
:::::HTH, HAND! [[Special:Contributions/172.70.90.227|172.70.90.227]] 21:02, 14 June 2022 (UTC)
::::::TYVM, 227! I just assumed there'd be a bot that auto-creates templates, for instance, create Template:2632 with contents "[[2632: Greatest Scientist]]"...
:::To close the Petri dish issue, (by the time I got to read tbis) the title text says "... that I left on the rail ..." so it wasn't one of the two hanging from the kite. [[User:RIIW - Ponder it|RIIW - Ponder it]] ([[User talk:RIIW - Ponder it|talk]]) 21:34, 14 June 2022 (UTC)
::::I noticed that -- two different petri dish "experiments". I don't think that any reference to Einstein's work is suggested/implied by the comic. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 15:42, 15 June 2022 (UTC)
:::::As before I agree and removed a new version of it. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 11:44, 17 June 2022 (UTC)
;Height shadow
I'm not sure which scientist (or probably ancient philosophy) it might be referencing, but I get the direct impression that the ''first'' shadow in the spiel (which KarlMann just removed the row for, and I agree that that it was redundant to the latter shadow, insofar as it was written) is directly referencing the principle of using a [https://geometryhelp.net/similar-triangles-calculating-height-tall-objects-using-shadow/ shadow to calculate height], as indicated by the illustration, as opposed to the 'shadow to calculate radius' of the latter one. [[Special:Contributions/172.70.90.227|172.70.90.227]] 10:19, 14 June 2022 (UTC)
: I think you're right, and I may have been a bit hasty. But also, I don't know of any association of that shadow measurement with Eratosthenes. I'd guess that it well pre-dates him (pun not intended). But I have no idea who might have done it first, or whether their name may have been lost to the mists of history, much less any citation to back myself up on this. -- [[User:KarMann|KarMann]] ([[User talk:KarMann|talk]]) 10:23, 14 June 2022 (UTC)
:: No, not hasty, as Erato's involvement was clearly less useful in that bit (and I take it that the ''h2'' local-horizontal to the dog is a typical Randall-joke comparison to the ''h1'' local-height to the tower-top), and it would just invite reversion to have merely cleared out the existing 'explanation' without something convincing to replace it. And I've nothing convincing (or based upon a definite named historic figure, or even an alleged/fabled one) in my mind, because I imagine the principle is Older Than The Pyramids, possibly back to Babylon/Ur/whatever if not even a hunter-gatherer rule-of-thumb.
::(Literally? Making an L with thumb and fingers and touching the thumb onto the end of your nose and sighting the tips of the upheld tips of fingers to a tree you're cutting down is also a pretty decent indicator (a couple of extra strides backwards might be reasonable!) of how far back is a safe distance when felling it. If you don't have that stick often mentioned in the arms'-length method. For some reason... despite being tolerably near at least one tree and having a handy axe available to you... ;) ) [[Special:Contributions/172.70.85.177|172.70.85.177]] 13:23, 14 June 2022 (UTC)
: Isn’t the first "shadow" mention an obvious reference to the famous story of how [[wikipedia:Thales of Miletus|Thales of Miletus]] (the "Father of Science") measured the height of the Great Pyramid ? Just google "Thales shadow" to get an idea of how widely known the experiment is. [https://www.jstor.org/stable/2690810?seq=1| This article] discusses it in detail. I think the Thales experiment would deserve a mention in the explanation.
::I agree, it's a reference to Thales. i'll add a row to the table.[[Special:Contributions/108.162.221.81|108.162.221.81]] 16:39, 15 June 2022 (UTC)

;Newton's Gravity
Newton didn't discover Gravity, (as Douglas Adams, as Dirk Gentley, said "they even leave it on at the weekend"). His insight was that there weren't separate Earth, Sun, Moon, Planet, etc gravities, but one Universal Gravity. He also worked out the equations which explain why we don't fall towards the sun. [[User:RIIW - Ponder it|RIIW - Ponder it]] ([[User talk:RIIW - Ponder it|talk]]) 21:50, 14 June 2022 (UTC)

In one of Diana Gabalon's Outlander series of books, one of the lead characters, Claire, reinvents penicillin circa 1770 but she time-traveled from the 1970's or so.
[[User:Joem5636|Joem5636]] ([[User talk:Joem5636|talk]]) 10:51, 15 June 2022 (UTC)

should it be mentioned that Galileo used pure logic to show that weight doesn't determine the speed of fall?
"Two identical bricks would fall side by side; no doubt about that. If a piece of string was tied
to them they still would. Shortening the string could not change that. Hence two bricks tied
together end to end would fall at the same speed as either brick alone. Now throw away the
string and glue the bricks together; no reason appears why this double brick of double weight
should fall faster than two bricks tied together—or either one alone"

;Black Hat
Am I the only one who thinks the scientist looks like Black Hat if you zoom in closely? [[User:Rayrge|Rayrge]] ([[User talk:Rayrge|talk]]) 12:39, 26 October 2022 (UTC)

2543: Never Told Anyone

2024-09-23T13:39:38Z

172.70.163.48: /* Explanation */

{{comic
| number = 2543
| date = November 17, 2021
| title = Never Told Anyone
| image = never_told_anyone.png
| titletext = Even if you said you were an employee of the website, if you asked for my password, I'd tell you.
}}

==Explanation==
This comic combines stereotypes about two secrets that one would normally be reluctant to share: {{tvtropes|DarkSecret|dark, personal secrets}}, and {{w|password}}s. In the comic, [[Megan]] appears to be about to tell [[Cueball]] a secret of the former variety, but twists it by instead revealing a {{w|one-time password|one-time code}} (presumably for the use of {{w|Multi-factor authentication|two-factor authentication}} for an online account). This is poking fun at the serious-looking warnings that typically accompany the generation of one-time codes. For example: "DO NOT share this code with anyone. We will NEVER call you to ask for it." While this is still something Megan should normally be reluctant to share, it has much less value to Cueball than a personal secret{{Citation needed}} unless his intent was to steal Megan's account - and even then it's probably useless, as these codes become invalid after they're used (hence the term "one-time") or a few minutes after generation. Cueball compounds the humor by reacting with a shocked gasp, as one would be more expected to react to a dark secret.

Users are generally warned never to tell their password to anyone, not even a support representative of the site; real technical support reps shouldn't ever need your password, and anyone with a true configured-in authority should never even find it necessary to know/use it. However, one tactic that crackers use to break into accounts is to claim to be calling from the site and say that they need your password to fix some vague and/or mythical problem with the account.

Intentionally or unintentionally, [[Randall]] has chosen as the fictional one time code the last six digits of the garbage compactor number from ''Star Wars: A New Hope'' (garbage compactor 3''' 263827''' ), only omitting the first digit, presumably because most one time pass codes are four to six digits long.

The title text says that Megan trusts Cueball so much that, despite knowing this, she would divulge her password to him even if he tried this approach on her. There is a further irony here, as Megan is focusing on the exception to the rule ("Don't ''even'' tell an employee" implies "You shouldn't tell ''anyone''") as if it was the most important factor.

==Transcript==
:[Megan and Cueball are holding hands, she has turned her head towards him, while he is still looking at the scenery. They are standing on the edge of a cliff, overlooking a vast stretch of land with water to the right and mountains far off. There are many details with lakes and smaller bodies of water on the land, three larger and three smaller clouds near the horizon and the sun is shining from the top right corner.]
:Megan: I've never told anyone this before.

:[Cueball has turned towards Megan, as they are still holding hands, in an otherwise empty panel.]
:Megan: I know I shouldn't.
:Megan: But I feel like I can trust you.

:[Megan and Cueball are no longer holding hands as he has taken both his hands up in front of his mouth and a sound escapes him, as shown with small lines coming off his head with the speech line going up from above them.]
:Megan: My one-time code is 263827.
:Cueball: ''*Gasp*''

{{comic discussion}}

[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]
[[Category:Romance]]
[[Category:Computer security]]

Talk:2988: Maslow's Pyramid

2024-09-21T06:58:40Z

172.70.163.48: But how?!

Oh wow, first post! {{unsigned|RadiantRainwing}}
: Congratulations on learning how to post![[Special:Contributions/172.68.245.228|172.68.245.228]] 03:40, 21 September 2024 (UTC)
The 20% figure is incorrect. The lower levels[[Special:Contributions/172.68.245.228|172.68.245.228]] 03:40, 21 September 2024 (UTC) of the pyramid have more volume than the upper levels. By my arithmetic, the breakdown is (rounded) 1%, 6%, 15%, 30%, and 49%, so the "safety" level provides 30% of his needs. [[User:Jordan Brown|Jordan Brown]] ([[User talk:Jordan Brown|talk]]) 00:27, 21 September 2024 (UTC)
:Plus the bottom layer ought to get partial credit for supplying basic shelter. [[User:Jordan Brown|Jordan Brown]] ([[User talk:Jordan Brown|talk]]) 00:29, 21 September 2024 (UTC)
:: I question this Cueball's ability to get anything okay enough.
[[Special:Contributions/172.68.245.228|172.68.245.228]] 03:40, 21 September 2024 (UTC)
Oh crud. What did I do that I think totally messed up the attributions? 172.68.245.228 [[Special:Contributions/172.68.245.228|172.68.245.228]] 03:53, 21 September 2024 (UTC)

But *how* did he build it? Was there some sort of internal ramp? Were extraterrestrials involved? [[Special:Contributions/172.70.163.48|172.70.163.48]] 06:58, 21 September 2024 (UTC)

2982: Water Filtration

2024-09-16T10:16:51Z

172.70.163.48: /* Explanation */

{{comic
| number = 2982
| date = September 6, 2024
| title = Water Filtration
| image = water_filtration_2x.png
| imagesize = 593x467px
| noexpand = true
| titletext = You'd think the most expensive part would be the quark-gluon plasma chamber, but it's actually usually the tube to the top of the atmosphere to carry the cosmic rays down.
}}

==Explanation==
{{incomplete|Created by WATER. JUST PLAIN WATER. NOTHING DONE TO IT, JUST PLAIN WATER. POSSIBLY DRINKABLE. PLAIN H₂O - Do NOT <s>DRINK THE WATER</s> delete this tag too soon.}}
This comic seems to be a diagram of how well water is purified, a common set of procedures done to make said water safe to drink. However, this well water is "purified" through a series of increasingly unnecessary, expensive, and possibly hazardous steps, ending with producing "pure" water synthesized from hydrogen and oxygen (which have each been synthesized from subatomic particles) - before promptly undoing all of the work by re-adding raw well water and its original minerals and probiotics, (which is one way of describing chemical and biological contaminants) "for taste and to support immune health". In real life, groundwater generally only needs treatment for any contaminants (chemical or biological) known to be a problem based on the results of water testing or an incident, but adding the original water back in could be dangerous if the water has not been sampled recently.
A faucet is "a device that controls the flow of liquid, especially water, from a pipe", commonly known as a ''tap'' in many parts of the world.

{| class="wikitable"
|-
!Step
!Real Device?
!Used for water treatment?
!Explanation
|-
|Water softener
|{{Yes|Real}}
|{{Yes}}
|{{w|Water softening}} is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing and appliances by reducing or eliminating scale build-up in pipes and fittings. The comic shows the water either being passed through some granulated material (presumably, {{w|ion-exchange resins}}) or into a precipitation chamber for lime (or soda ash) softening. This is one of the few steps in this process that arguably fits the comic title of "Water Filtration."
|-
|Reverse osmosis
|{{Yes|Real}}
|{{Yes}}
|{{w|Reverse osmosis}} is a common step used in modern water-purification systems. It relies on using osmotic membranes and high pressures to separate water molecules from dissolved solutes and biological substances. Interestingly, it would also act as a softening step, rendering the previous step potentially redundant, depending on the goals for each step. It's also overkill for most wells, as groundwater often needs treatment targeted to only a few contaminants, if any treatment at all. This is one of the few steps in this process that definitely fits the comic title of "Water Filtration."
|-
|Ultraviolet Sterilization
|{{Yes|Real}}
|{{Yes}}
|{{w|Ultraviolet germicidal irradiation|Ultraviolet sterilization}} uses UV lamps at short wavelengths to damage the DNA and thereby kill micro-organisms in the water. In the USA, this is an uncommon method of well water sterilization, as the pathogens most likely to be found in well water (as opposed to surface water) are generally much more responsive to chemical disinfection. Many wells don't even need a disinfection step; whether this well needs disinfection or not, this is hardly the most impractical step in this treatment train.
|-
|Autoclave
|{{Yes|Real}}
|{{Yes}}
|{{w|Autoclaves}} are essentially large pressure cookers that sterilize items and liquids through exposing them to a high temperature (~120°C or ~248°F) over tens of minutes in presence of water. By maintaining a high pressure, the boiling point of water goes up. This creates a very hot and humid atmosphere, making efficient heat transfer with all contents and inactivating all biological entities through this heat. They are commonly used in hospital and laboratory settings to sterilize plastics, glassware, equipment and solutions (like bottles of growth medium for bacteria) to be used in a sterile environment. The advantage of this method compared to dry heat (aka putting things in a 150°C-180°C oven until they are sterile) is that most lab plastics survive a passage at 120°C without melting. While difficult to streamline (as this technique is used for batches), it has the advantage over light-based methods that heat gets everywhere, and that instead of just damaging DNA, you also denature the proteins and other structures of microorganisms.
|-
|Condenser
|{{Yes|Real}}
|{{Yes}}
|This step condenses the steam generated by the autoclave back into water. This is a normal part of the process used in "traditional" water purification by distillation.
|-
|Regular osmosis
|{{Yes|Real}}
|{{No}}
|Regular osmosis (also known as "osmosis") is the tendency of a solvent (like water) to flow through a semipermeable membrane towards the side that has a higher concentration of dissolved molecules or ions. It therefore goes from a purer state to a less pure state, the opposite of filtration.
|-
|X-Ray Sterilization
|{{Yes|Real}}
|{{No}}
|{{w|Sterilization_(microbiology)#Ionizing_radiation_sterilization|X-ray sterilization}} is used to sterilize equipment, and may also be used as a cold method (in contrast to techniques like pasteurization) of eliminating germs and killing insects in fresh foodstuffs. Has also been used to sterilize postal mail.
|-
|Carbon Filter
|{{No|Fake}}
|{{No}}
|The water is passed through some volume of carbon - a riff on activated carbon filters, which ''are'' used in water filtration as seen later in the process. The exact {{w|allotropy|allotrope}} of carbon is not mentioned, so this could possibly be a graphite, carbon nanotubes, or even solid diamond "filter". This is one of the few steps in this process that definitely fits the comic title of "Water Filtration."
|-
|Neutron Source
|{{Yes|Real}}
|{{No}}
|A {{w|neutron source}} generates high-energy neutrons. High-energy neutrons are highly penetrating and will cause ionization events to occur due to collision with atoms in the water. This can potentially make the water more radioactive due to the generation of radioactive isotopes.
|-
|Activated Carbon Filter
|{{Yes|Real}}
|{{Yes}}
|{{w|Activated carbon}} is a form of carbon commonly used to filter contaminants from water and air, as it has a large surface area available to adsorb impurities on its surface. While this isn't a strange step to see in a water purification process, Randall makes a pun here with its proximity to the neutron source - the carbon has been '{{w|Neutron activation|activated}}' by the neutron source, and is currently radioactive. Water filtered through this may pick up radioactive isotopes from the filter. This is one of the few steps in this process that definitely fits the comic title of "Water Filtration."
|-
|Gamma Ray Sterilization
|{{Yes|Real}}
|{{No}}
|Similar to x-ray sterilization, this step uses {{w|Sterilization (microbiology)#Ionizing radiation sterilization|gamma rays}} to sterilize the water. Gamma rays can potentially irradiate the water through photodisintegration if their energy is higher than the binding energy of oxygen.
|-
|Cosmic Ray Sterilization
|{{No|Fake}}
|{{No}}
|Similar to the previous step, but this time using high energy {{w|cosmic rays}} to do so. This would be incredibly impractical, as cosmic rays are generally blocked by the atmosphere at high altitudes (as stated in the title text). Furthermore, their extremely high energy (shown to be in the exa-electron volt (EeV, or 1018 eV) range) would cause multiple high-energy particles to be created on impact with the water molecules, irradiating the water significantly.
|-
|Electrolysis
|{{Yes|Real}}
|{{No}}
|The water is broken down into hydrogen and oxygen gas using an electric current. Assuming the gas outputs of this process are pure hydrogen and oxygen gas, this *would* be an extremely effective sterilization tactic, seeing as no known organism or water pollutant is entirely composed out of hydrogen or oxygen gas. Along with the next step, this step may be a misguided attempt to "take the water apart and clean each part individually". The hydrogen is sent to the ionizer, while the oxygen is sent to the oxygen spallation step.
|-
|Oxygen Spallation
|{{No|Fake}}
|{{No}}
|Almost all oxygen in existence was originally created via {{w|stellar nucleosynthesis}}. Now, in this step in the purification, the oxygen is apparently broken down back into hydrogen via a fictional form of {{w|Cosmic_ray_spallation|spallation}}. While spallation can form lighter nuclei from heavier ones, there is no known process to convert oxygen back down to hydrogen. It is unclear what happens to the neutrons present in the oxygen nuclei - whether they are removed, used to create hydrogen isotopes or allowed to decay into protons and electrons (the components of yet more hydrogen, when properly reintroduced). The hydrogen formed here is merged with the rest of the hydrogen before being sent to the ionizer.
|-
|Ionizer
|{{Yes|Real}}
|{{No}}
|The hydrogen output by the previous step is made into a plasma with free electrons and protons (not bound into atoms).
|-
|Quark-Gluon Plasma Chamber
|{{No|Fake}}
|{{No}}
|The plasma output from the previous step is further energized into a {{w|quark–gluon plasma}}, such as the one found just after the Big Bang. This follows the theme of the previous steps, which all serve to break the water down into their elementary components. The incredible energies involved in doing so are unachievable by current technologies (current particle accelerators can form such a plasma for very short periods of time and involve a very small amount of matter), and serve to highlight the impracticality of this setup (as alluded to in the title text). The energies would also result in formation of lepton pairs from energy, which is presumably where the electrons from the previous step ended up.
|-
|Hydrogenation
|style="background:#FFFF9E;vertical-align:middle;text-align:{{{align|center}}};{{{style|}}}" class="table-yes"|Kinda
|{{No}}
|This process converts the quark-gluon plasma output in the previous step into elemental hydrogen, reversing the previous two steps. Presumably, this is done via {{w|hadronization}} and {{w|recombination}}; however, it is unclear how the {{w|baryon asymmetry}} needed to generate matter and not anti-matter is developed. The resulting hydrogen is split into 2 streams leading into the Nucleosynthesis and Reverse Electrolysis steps. In real life, {{w|hydrogenation}} is the process of adding hydrogen to unsaturated hydrocarbons.
|-
|Nucleosynthesis
|{{No|Fake}}
|{{No}}
|Part of the hydrogen produced in the previous step is converted into oxygen via 2 sub-processes. The hydrogen is first converted into helium and carbon through a combination of the {{w|proton-proton chain}} and the {{w|CNO cycle}} as per the labels on the step. The helium and carbon are then converted into oxygen through the {{w|alpha process}}. This step may also involve the {{w|triple-alpha process}}, seeing that the alpha process is typically only applicable to converting carbon into heavier elements owing to the lack of a stable element with eight nucleons. These steps normally occur in the cores of massive stars. It is not known how the oxygen is filtered from the extremely hot plasma of fusion products.
|-
|Reverse Electrolysis
|{{Yes|Real}}
|{{No}}
|This step is essentially a fuel cell, utilizing an electrochemical reaction to convert hydrogen and oxygen back into water and electricity.
|-
|Adding Well Water
|{{Yes|Real}}
|{{Yes}}
|A second pipe is linked to the first that simply feeds untreated well water into the pipes, partially undoing the entire process. Even if the well water is only a small portion of the faucet water, its presence has now made the now incredibly pure water impure. This act of putting well water into the faucet after treating it may be a riff on the cultural interest in "spring water" or "pure glacial water" that is said to have additional minerals or beneficial properties but is oftentimes not meaningfully distinct from properly treated tap water. "Local minerals and probiotics added" may be a reference to Coke's "Dasani" brand drinking water, which is purified by reverse osmosis, and then has a package of minerals added to create the flavor (pure water's actual lack of flavor can be perceived as an unpleasantly 'flat' flavor).

In addition, drinking only {{w|Tonicity|extremely hypotonic}} liquid intake can induce the body to expel more water than it took in (taking with it some essential minerals that are not being replaced) to try to maintain equilibrium of concentrations. This effect is not directly dangerous, but could exacerbate other bodily deficiencies in the long term and have the issues of greater than necessary liquid throughput than with 'normal' drinking water. The tendency for {{w|Sports drink#Categories|many 'sports' or 'health' drinks}} to hype the term 'isotonic' is based upon the idea that an ideal concentration of solutes can be added, in-between the opposing problems of having either too many ''or'' too few 'impurities'. The process does not include adding untreated (and probably also untested/unquantified) ground water, which could carry pathogenic organisms and chemicals, and appears to have no mechanism for ensuring what ''might'' be an acceptable level of re-blending for the circumstances.

Alternatively, it may be that the level of purity achieved by this setup is so overkill, and the cost per liter processed so high, that it's simply more efficient to treat just enough of the water to dilute the rest of the water to acceptable levels of contaminants. For example, it's common to use a partial bypass to supply water to the shower, since shower water does not need to be potable. Also, some well water systems are clean enough to not need any treatment at all and can be used straight from the well, and some water systems are only slightly high in a single chemical contaminant that can be addressed by blending the water, either with treated water or another source (treated or untreated). Perhaps the treatment process led to enough radioactivity that blending with the original source was required to address radiological contamination (either gross alpha radiation or specific radionuclides).
|}

The title text briefly covers the cost implications of the components. Various 'real' filter elements will have material or energy costs or both, in operation or to replenish their effectiveness, and the high energy input needed to disassociate hadrons into raw quark–gluon plasma (at bulk levels) would seem to require the most in terms of running the equipment. But it is pointed out that to ''ensure'' enough cosmic rays reach that particular phase of sterilization, there would have to be a pipe (not shown) leading out to the edge of the atmosphere to optimistically carry down such particles (due to also containing ''no'' air, i.e., keeping it out to negate the normal {{w|Air shower (physics)|shielding and dissipating effect}} of the atmosphere on cosmic rays). However, this pipe would not only be a flight hazard, but also to ensure that no air molecules get in, the pipe would have to be similar to a space elevator, which would wreak a lot of havoc on LEO and MEO.
Whether a one-off cost or needing regular replacement, the setting up of such a tubular structure (a vertical air-proof pipe perhaps somewhere between 100 and 10000 kilometers high) would be technically challenging and has not ever been actually accomplished. The conditions for a quark–gluon plasma, albeit in limited quantities, at least have been fulfilled at {{w|CERN}}, with its 27 kilometer airless pipe that goes round within a vast circular tunnel.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[Header:]
:How Water Filtration Works

:[A system of various devices between water pipes is shown.]
:[Input:]
:Well water
:[Labels of various devices:]
:Water softener
:Reverse osmosis
:Ultraviolet sterilization
:Autoclave
:Condenser
:Regular osmosis
:X-ray sterilization
:Carbon filter
:Neutron source
:Activated carbon filter
:Gamma ray sterilization
:Cosmic ray sterilization [On the device: "EeV γ"]
:Electrolysis [H2O split into O and H]
:Oxygen spallation [O becomes H]
:Ionizer [H split into + and -]
:Quark-gluon plasma chamber [+ and - become QGP]
:Hydrogenation [QGP becomes H]
:Nucleosynthesis [H goes through "P-P CNO" and becomes He and C, then through "Alpha" and becomes O]
:Reverse electrolysis
:[Output after devices:]
:Pure water
:[Second input, mixed with pure water:]
:Well water
:[Label:]
:Local minerals and probiotics added for taste and to support immune health
:[Final output:]
:To faucet

{{comic discussion}}

[[Category:Chemistry]]
[[Category:Physics]]
[[Category:Engineering]]

Talk:2985: Craters

2024-09-15T14:10:07Z

172.70.163.48: /* Geographic bias by meteorites or Randall? */

==Delaware/Pennsylvania Arc==
The Delaware/Pennsylvania arc is a circle, sure, but so is every other allegedly "straight" line on the map. The 49N parallel looks like a straight line on some projections, but a polar projection shows that it is clearly a circle around a point on the Earth's axis. The Delaware/Pennsylvania arc is only unique for NOT being aligned with the axis. [[Special:Contributions/172.71.102.20|172.71.102.20]] 19:07, 13 September 2024 (UTC)
:The "Delaware/Pennsylvania arc" has a long and juicy history. Not a circle. [https://en.wikipedia.org/wiki/Twelve-Mile_Circle Twelve-Mile Circle] Signed- --[[User:PRR|PRR]] ([[User talk:PRR|talk]]) 20:36, 13 September 2024 (UTC)
:True about map projections, but the Venn section title here does say *Weird*. The Delaware/Pennsylvania arc is indeed "weird"; few other such arcs are found in regular map content, and the original story for it is indeed uncommon. <s>Great Circle</s> Parallel latitude "arcs" aren't weird in either way. [[Special:Contributions/172.68.34.64|172.68.34.64]] 20:52, 13 September 2024 (UTC)
::North-South lines are great-circle arcs, but non-equatorial East-West lines - as well as many diagonal ones - are minor-circle arcs (is that the right term?), just link the 12-Mile Circle. (Let's see if this retains my IP address from my top post.) [[Special:Contributions/172.70.46.109|172.70.46.109]] 21:29, 13 September 2024 (UTC)
:::Right you are! [[Special:Contributions/172.68.34.64|172.68.34.64]] 23:00, 14 September 2024 (UTC)

==Great Blue Hole==
There are two Great Blue Holes, one in Belize, one in Dahab, Egypt (Red Sea). [[Special:Contributions/172.71.102.20|172.71.102.20]] 19:11, 13 September 2024 (UTC)
==Recent Google Maps discovery==
This may be inspired Joël Lapointe's very recently announced discovery of a 15km-diameter "pit" he found near Marsal Lake (Quebec) using Google Maps. [https://www.cbc.ca/news/canada/montreal/quebec-meteorite-impact-crater-1.7313418 "He saw a suspicious pit on Google Maps. Experts say it could be a crater from an ancient space rock"] [[Special:Contributions/172.69.64.185|172.69.64.185]] 20:10, 13 September 2024 (UTC)

----

man, why are so many of these in Quebec? does it have a natural meteor/circle magnet? [[Special:Contributions/172.68.174.232|172.68.174.232]] 01:11, 14 September 2024 (UTC)

: Parce qu'on y parle français. [[Special:Contributions/172.69.71.68|172.69.71.68]] 12:39, 14 September 2024 (UTC)

==New Column==
I'm thinking about a new column or two: GPS coordinates (with an Open Earth link?) and a satellite image, or something. [[Special:Contributions/172.71.102.76|172.71.102.76]] 03:27, 14 September 2024 (UTC)

: The table seems incomplete without something like that. [[Special:Contributions/172.69.34.172|172.69.34.172]] 22:50, 14 September 2024 (UTC)

==Meta Reference: Venn Diagram Double Crater==
No comment yet on the fact that the two circles in the Venn Diagram refer to craters and circles... [[Special:Contributions/172.71.102.53|172.71.102.53]] 01:32, 15 September 2024 (UTC)

==Geographic bias by meteorites or Randall?==
Boy am I happy that I don't live in North or Central America, where 11 out of 13 "craters" are located... [[User:Mumiemonstret|Mumiemonstret]] ([[User talk:Mumiemonstret|talk]]) 07:44, 15 September 2024 (UTC)
:Maybe over here (rightpondia, oceania, down-under and the cradle of humanity itself), we just cleaned them up easier (or messed them up badly) so they were less obvious. (c.f. Nördlingen.) Y'all over thataway, however, haven't had time to do anything too drastic to obscure them. ;) [[Special:Contributions/172.70.163.48|172.70.163.48]] 14:10, 15 September 2024 (UTC)

Talk:2916: Machine

2024-09-14T05:32:50Z

172.70.163.48:

rather late for an april fools comic innit? also there doesn't seem to be anything exciting in this one lol, none of the usual cool exploration easter eggs, as far as i could tell at least [[Special:Contributions/172.71.178.76|172.71.178.76]] 16:41, 6 April 2024 (UTC)Erfaniom
:Randall posted an eclipse comic on Apr. 1. All April Fools comics are interactive. [[User:Z1mp0st0rz|Z1mp0st0rz]] ([[User talk:Z1mp0st0rz|talk]]) 15:27, 10 April 2024 (UTC)

: We're exploring crowdsourced human creativity here, in a way, so it can be a lot more interesting then Randall's exploration comics, at least for me, because i did take two years of GCSE psychology and enjoyed it. [[Special:Contributions/172.64.238.130|172.64.238.130]]

: looks like the egg's on my face lmao, i think i was among the first people to make anything, so everywhere was under construction for me, i didn't even understand that it was like a crowd thing [[Special:Contributions/172.70.210.52|172.70.210.52]] 14:19, 9 April 2024 (UTC)Erfaniom

Just popped over using Chrome on Android and all I see is four "missing picture" logos spinning around, plus another down the bottom right... [[Special:Contributions/141.101.68.193|141.101.68.193]] 18:13, 6 April 2024 (UTC)
:Okay, followup: it behaves quite differently on the non mobile site. You get two entry points with red balls and yellow balls and you need to place the various gizmos to direct the balls to the correct exit point. Once enough have correctly passed to turn the red X into a green tick, you have the option to submit. If you do, once you have named your design it will be added to the grid with other submissions all of which exist to push red and yellow balls around. (if you come across "Memories of Ragnarok", that's mine)
Mine are "Balancing Act" and "100% Success Rate" [[Special:Contributions/172.71.146.14|172.71.146.14]] 21:11, 15 April 2024 (UTC)
[[Special:Contributions/172.71.134.207|172.71.134.207]] 18:27, 6 April 2024 (UTC)
::The number of inputs appears to vary between 1 and 4, each of a different color, with one color-coded output for each. [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)

On the "machine" section, you see lots of "under construction cells". Perhaps this will develop as more are submitted. I notice the "under construction tape" has "DJIA" and "31415", perhaps a reference to "dow jones industrial average" and the first five digits of pi. [[User:Zeimusu|Zeimusu]] ([[User talk:Zeimusu|talk]]) 18:37, 6 April 2024 (UTC)
:Whenever someone submits a cell, it fills in one of the under construction cells. [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)
[Robert'); DROP TABLE Student!:;--] i just got a machine with 3 outputs one yellow another red and a third blue AND green and 3 inputs one green one blue and one red blue and yellow https://xkcd.com/2916/#xt=7&yt=50 hope its still there {{unsigned ip|172.70.115.173|18:01, 9 April 2024}}
:I think I just 'did' one with a Red+Yellow source (also separate singular Blue and Green) and a combined Blue+Green sink (and separate Yellow and Red). Got it working well, actually using fan-levitation to separate the R+Y enough to route them to their destinations, the Y then having to cross the occasional flying Green (which I was forced to "Bonk" and bounce up, entry being nearly at the bottom on right, exit being nearly at top on left) for its exit, everything else fairly simple. No idea if it got integrated, of course. Never seen any of my machines be accepted (when I later look around at what's there), so I'm still unsure if there's anything I can do to increase my chance of a successful square being made permanent on the grid.... [[Special:Contributions/172.70.163.49|172.70.163.49]] 20:58, 9 April 2024 (UTC)
:...still had it sitting there [https://imgur.com/kZdp3kH on my browser], though note that the Red+Yellow supply (mid-left) and the Green supply (right) aren't working here, through the "move the screen around, lose the feeds from 'Under Construction' squares" issue, or similar. But still I managed to submit it. The occasional Yellow and Red are falling from the Blue entrance in the top (I've not done anything special to filter those out/send them to a more proper exit, and it's too late to do so now anyway, it was just a Blue entry during the development process, of course).
:It's a pity you can't see it working, but I quite like my Yellow/Red separation. This might be the only time you see it in place, though, so a shame I didn't take a screenshot immedediately after submitting it. [[Special:Contributions/172.70.163.49|172.70.163.49]] 21:30, 9 April 2024 (UTC)
:I encountered a puzzle with five distinct pairs of in/out (none combined): Two blue, two red, one yellow. It was difficult! AFAIK five pairs is the highest reported so far. When I submitted the solution to the Machine, it had Under Construction above and to each side, and (IIRC) empty below, and no balls were provided, alas.[[Special:Contributions/172.69.134.216|172.69.134.216]] 03:46, 12 April 2024 (UTC)
I wanted to add an image for each object, but do not have the necessary access, can someone who has access add the images that I linked in the table so they can be included? [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)

I found a discussion with some guy talking about the API at https://euphoria.leet.nu/room/xkcd/ ; this could be useful for the wiki.

<code>
[c+1] now time to try fucking with the api
[c+1] https://incredible.xkcd.com/
[userwithnoaccount] 404
[c+1] it seems there are numbered machines under incredible.xkcd.com/machine/x
[c+1] returns a grid of individual machinlets
[c+1] which are uids like 3a7af27c-5389-5dcb-b660-3feab6be2ceb
[c+1] they're stored at urls like incredible.xkcd.com/folio/3a7af27c-5389-5dcb-b660-3feab6be2ceb
[c+1] there appear to be 33 machines total
[c+1] the json it returns seems to refer to these as "versions"
[c+1] $ curl -s https://incredible.xkcd.com/machine/21 | jq ".version"
21
[c+1] there is a machine/0, but it's all null
[c+1] going to https://incredible.xkcd.com/machine/current redirects to the current machine
[c+1] $ curl -sL https://incredible.xkcd.com/machine/current | jq ".version"
35
[c+1] wait, is that the *total* number of mahcines?
[c+1] i would've thought there'd be more
[c+1] this whole think is rather esoteric
[c+1] Written in rust, too: https://rapier.rs/
[c+1] Uh oh.
https://i.hypercone.us/?v=8e283d
[c+1] HMMM
https://i.hypercone.us/?v=079f8f
[c+1] it seems there is no limit
[c+1] i've uploaded a ~50M title
</code>

With this I was able to make a script that visualizes paths of the balls. I was hoping that there would be an interesting pattern somewhere but it appears to be mostly random (https://i.imgur.com/ZvLlucU.png) --[[Special:Contributions/172.71.131.24|172.71.131.24]] 17:12, 12 April 2024 (UTC)

[[Special:Contributions/172.70.57.146|172.70.57.146]]

Had quite a lot of fun, added a few 'successful' machines to the grid. Noted that whenever I try to use the Prism that (after a short delay) the comic-pane blanks and I need to refresh the page/get a completely new 'challenge' to start from scratch, so I'm just not using the prism at all (used most of the other items, in combination or 'just the one across the whole board', whichever seems most fun). But it doesn't seem to do what I'd like it to do, which is sort multiple colours from the same inflow into different outflow directions. Which would be ''very'' useful in a 'crossroads' situation, the general solution of directing them cross-path being too prone to random collisions. Also might be useful in the 'submitted machine grid', as I note that errors propagate, whereas adding a filter on all inputs would clean out (dispose of/send off to a valid gate?) the rogue balls. Anyway, gonna have to come back to this later when there's more time... Maybe then I'll even have something useful to add to the Explanation. [[Special:Contributions/172.70.163.31|172.70.163.31]] 19:03, 6 April 2024 (UTC)

The balls appear to be different weights. I just saw a machine that used fans to separate yellows from greens and blues in a sort of 'wheat from the chaff' manner to direct them to their correct outputs. I wonder what other hidden tricks are included. [[Special:Contributions/172.68.1.159|172.68.1.159]] 19:40, 6 April 2024 (UTC)

They're not all accepted, though it makes you think they are. Or something else more complex is going on we haven't realized yet. I made a machine that was working reliably, submitted it, and saw it on the overall grid. Reloading from a different browser I found the same location of the machine, with the same surroundings, but my machine had been replaced. It's nowhere else on the grid either. The first browser still shows it (but not after a reload with a cache clear). I'm not sure if there's some kind of "save" event that needs to happen beyond seeing your machine in the broader one, or if all user collaboration is an illusion, or if the system changes its mind about us somehow.

: Yeah, i've been seeing this too. Please tell me if you find any of my machines, images at https://i.hypercone.us/?v=22d562 , https://i.hypercone.us/?v=ad8e3a , and https://i.hypercone.us/?v=8d4d6a . I want to be one of the few to have added Catalan and Spanish to the grid. [[Special:Contributions/172.71.134.164|172.71.134.164]] 20:56, 6 April 2024 (UTC)

I've added some more observations to the page. Also, a guess which is too uncertain to put on the main page: The ball launcher for the yellows on the far left side misses a lot, and the yellow container isn't the one on the left. So I think the whole machine with crossing streams will result in the colors being sorted in their container order, and possibly have the streams combined and deposited at the bottom just above the containers. --[[Special:Contributions/172.71.147.100|172.71.147.100]] 21:07, 6 April 2024 (UTC)

has anyone seen the boat at the very bottom? [[User:Mushrooms|Mushrooms]] ([[User talk:Mushrooms|talk]]) 21:21, 6 April 2024 (UTC)

trying to see it on Firefox for Ubuntu and it just tells me to "visit xkcd.com to view" - THAT'S WHERE I AM?! Tried clearing website data (but not my entire cache) and that didn't help. Is there something I'm missing?

Oooh, just had one with four ball-entries (four colours) and ''three'' exits (one caters for two arrows). Pity it's rather complicated to get entries to exits (even if I can merge two of the streams). Might have to give up on it, but I'd like to have seen how it fits in with the 'submited grid'. i.e. someone else gets a two-colour introduction spot. [[Special:Contributions/162.158.74.119|162.158.74.119]] 22:37, 6 April 2024 (UTC)
:Me again. I'm just refreshing the page, looking at the pattern of entries/exits (just a dozen or so screens in, getting some repeats of pattern, indicating that it's going back to tiles it was suggesting before, probably depends on how many others are contributing and extending...)
:Found another 'double-colour' example. Two yellows ''from the same side'', which probably means that there's a two-yellows been asked to exit from the neighbour (will check shortly).
:Quickly adapting from my spreadsheet notation, "R, Y, G, B" in order, each "(Entry, Exit)", I've been using <dir> of L/R/T/B and a number (nominally percentage, though seems to include only values of 20, 30, 50, 70 and 80, so it ''might'' be more 1/6..5/6?) relating to the distance along from L to R (for T/B) or T to B (for L/R).
:This line is therefore (0,0)(L20+L70,R30+B70)(R80,L80)(T70,L50) ... no reds, two yellow pairings, a red pairing, a blue pairing. Would require at least two path-crossings (but I was going to calculate those things later, and double-colours might confuse my intended simple line-intersection calculation).
:...anyway, spent some time on this message, which might mean I'll get into a 'new batch' of available patterns as people have succeeded some of the challenges that I've been 'swiping left'. [[Special:Contributions/172.70.162.20|172.70.162.20]] 19:28, 7 April 2024 (UTC)
:...very next click: (0,0)(T30+L20,R20+R70)(R80,L80)(R50,B50), which is clearly the actual left-neighbour of the above. [[Special:Contributions/172.70.162.19|172.70.162.19]] 19:32, 7 April 2024 (UTC)
:Ok, stopped my refreshing to [https://imgur.com/a/OMFOmzy 'solve' a screen]. First of all I routed both yellows entries (right-upper and upper-right) to one yellow exit (middle-left) and gradually teased the greens across (lower-left to middle-right), as that way I was avoiding a criss-cross of balls, but the the other yellow exit (left-lower) was, of course, invalid.
:Changed it to drop one stream of yellows down towards the lower exit, across the rapidly firing greens (added a fan to filter away the occasional yellow that gets bounced over there, not much of an opportunity to filter falling-greens out of the yellow exit, so apologies to whoever gets the sceen below). Submited as "Two Yellows, One Green!", whether or not that'll save (apparently, I should continue to contribute and not refresh/close, or else the server will not keep the solution?).
:Interestingly, all four adjacent tiles are "Under construction", and if I scroll up... *DARN* the comic has blanked out (nothing there between the upper PREV/RANDOM/NEXT buttons and the lower ones, just whitespace). This may mean that it did not save. This is the kind of 'page crash' I get when I try using a Prism or get too many balls rattling around on top of a Black Hole. Perhaps it doesn't like that I'm scrolling into an Under Construction that shouldn't be there? (But then, why ''is'' it there?)
:Anyway, all extra information for everyone.
:I'll just refresh the page and go back and do some more entry/exit mapping, maybe? [[Special:Contributions/172.70.162.20|172.70.162.20]] 20:17, 7 April 2024 (UTC)

If you combine a bunch of these silly claw things in the middle by just spamming it, it begins to lag and do some chaotic collisions, even without balls colliding on it. It's curious how it does that seemingly randomly though. I wonder how calculations are added and if there's a tiny sprinkle of RNG. (Also, errors occur and say something about damaging recursion in the Rust programming language, so I guess we know how it was made. It's also pretty weird how there's not a lot of opening combinations? It's possible that the machine loops over in chunks of gears or something (that's what I'll call them). ([[User talk:Leo|talk]]) 13:15, 7 April 2024 (UTC)

If you place a black hole in the centre of a wheel, it makes the wheel behave unpredictably between resets. Sometimes it's almost normal, sometimes it's a lot faster than usual, and sometimes it's stopped but launches balls that touch it with extreme force. I was able to use this to submit a machine which didn't actually let a single ball through after being submitted. https://i.hypercone.us/?v=928bcd [[Special:Contributions/162.158.33.149|162.158.33.149]] 01:19, 7 April 2024 (UTC)

The page says that (and I have taken note of) the ball hue is ''coded'' to certain values, but is there a logic to those values that might be derived from the colour (either as RGB triplet or HSV/other colourspace definition). For example, the two ball-types with zero green component in their makeup are 'unit density' (green is far heavier "green+red" is far lighter, so it's not a simple relationship, unless it converts from °hue, in some way) and the only secondary colour exhibits non-zero drag. There's the possibility that it just derived from "we need different properties, we need different colours, we have no reason to connect either with other deliberately" or even some non-mathematical symbology (fire=red, water=blue(?), earth=green, air(/sunlight?)=yellow). But it makes me wonder what combination of properties cyan/magenta balls might have, if added. (Or is the choice of those four colours constrained, anyway? Though R/G colorblindness is already something of an accessibility failure, if anyone suffers that.) [[Special:Contributions/172.69.194.205|172.69.194.205]] 17:02, 7 April 2024 (UTC)
:For color vision issues, on Mac, open System Preferences, select Accessibility, select Display (in the Vision group), select the Color Filters tab, select Enable Color Filters, then finally try the different filters in the Filter Type menu. One of them should help make the colors distinct.[[Special:Contributions/172.69.134.216|172.69.134.216]] 03:40, 12 April 2024 (UTC)

[https://pastebin.com/7PAiLnyF Python script to get the URL and title of each Cell in the current machine]

[https://pastebin.com/xBhywGde Result of running that script at the moment] (encoded with ROT13 because pastebin wouldn't let me save it otherwise)
:has anybody at all whatsoever been able to find their creation using this API? [[User:Bellydrum|Bellydrum]] ([[User talk:Bellydrum|talk]]) 21:58, 7 April 2024 (UTC)

[https://pastebin.com/jN5MP2za Result of running that script on the first 42 machines], at least on these it looks like the only difference is that one cell is added each time? [[Special:Contributions/172.71.99.195|172.71.99.195]] 17:22, 7 April 2024 (UTC)

I've submitted four now, none of which was accepted. I tend to spend a lot of time getting them just right. Any hints as to what the acceptance criteria might be? Or do I just stink at this?
[[Special:Contributions/172.69.59.204|172.69.59.204]] 19:47, 7 April 2024 (UTC)

There appears to be a new object: a cat that bats things that touch it.
[[Special:Contributions/172.69.214.39|172.69.214.39]] 20:17, 7 April 2024 (UTC)

Is anyone else experiencing the bug where prisms cause the comic to disappear (leaving only the white background where it was) after a while? It makes viewing the whole machine basically impossible. (On further testing it appears to be firefox-exclusive.) [[Special:Contributions/172.70.162.38|172.70.162.38]] 20:31, 7 April 2024 (UTC)
:I've had the "Prisms break things" from the beginning (before any practical content). As in, trying to use them in a design breaks things. But I ''did'' glance upon their occasional use in the 'view submissions grid'. Right now I'm suffering from "white only" issue (see my "multi-yellow" accounts, above). I ''am'' using Firefox, if that's indeed relevant to this issue, but right now I'm not near any other up-to-date browser I care to use. [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:37, 7 April 2024 (UTC)
:I'm getting the same issue with black holes (which probably makes more sense - put a black hole there and you'd expect everything else to disappear :o) - except that on one occasion I was able to put about 6 black holes in before the 7th one vanished everything.[[Special:Contributions/172.69.194.121|172.69.194.121]] 09:15, 8 April 2024 (UTC)

Has anyone seen their own cell in the machine at all yet? A manual approval system is probably necessary for obvious reasons, but if so it does seem to be moving quite slowly.
[[Special:Contributions/172.69.65.24|172.69.65.24]] 02:58, 8 April 2024 (UTC)

I've never seen one of my own cells after refreshing the page. :( [[Special:Contributions/172.70.110.122|172.70.110.122]] 20:27, 12 April 2024 (UTC)

How on earth is everyone seeing different parts of the grid? If I request "view machine" I can only see my own square, and the edges of everyone elses. Nothing else, definitely not all of the machine. [[Special:Contributions/172.68.64.149|172.68.64.149]] 21:11, 8 April 2024 (UTC)
::You should be able to click and drag the view around. [[Special:Contributions/172.71.242.54|172.71.242.54]] 21:41, 8 April 2024 (UTC)

Whoever designed the room entirely full of fans is evil - every time I scroll near it my entire browser freezes up and becomes unresponsive. And then the comic usually blanks.[[;8Special:Contributions/172.69.194.81|172.69.194.81]] 08:23, 9 April 2024 (UTC)

None of [https://www.explainxkcd.com/wiki/index.php?title=2916:_Machine&diff=339487&oldid=339486 these edits] were anything to do with "grammar", so why would anyone describe the change as such? The spelling of "colo(u)r" is an internationali[s|z]ation issue, of note, and why I usually prefer to defer to using words like "hue", instead, in such contexts on this site. The change of the link from "The Incredible Machine" (where the page exists) to "The Credible Machine" (where it doesn't, because that's really just this comic's own joke) I aready changed back... If you think it doesn't properly explain the pun/negation, then rewrite; but don't make it an invalid link to something that doesn't even exist, as you'd know if you had even followed the link(s). [[Special:Contributions/172.69.194.141|172.69.194.141]] 15:22, 12 April 2024 (UTC)

Folks might be interested in my list of all published blueprints with their titles and permalinks: https://github.com/scpso/incrediblexkcd. scpso [[Special:Contributions/172.68.144.147|172.68.144.147]] 13:18, 14 April 2024 (UTC)

== Level scrolling bug ==

When one views the whole machine, and scrolls down far enough, everything just disappears, and the comic is completely unresponsive. Has anyone else seen this? [[Special:Contributions/198.41.236.152|198.41.236.152]] 20:38, 7 April 2024 (UTC)

:I'm now seeing the same issue, I wasn't before. (I'm using Chrome) [[Special:Contributions/172.70.162.20|172.70.162.20]] 21:06, 7 April 2024 (UTC)

::A hard refresh appears to have fixed this for me (same person as above). [[Special:Contributions/141.101.99.101|141.101.99.101]] 10:28, 8 April 2024 (UTC)

:I've been having this issue as well (I'm using firefox). Opening the site in Edge instead seemed to work around it for me, so it might only affect Firefox (and derivatives). [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:27, 7 April 2024 (UTC)
::See also the 'firefox bug' comments currently immediately above this section. (Please don't ask me to start Edge up, I hate it, won't use it any more than the system requires me to...) [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:37, 7 April 2024 (UTC)

:Update - I did a hard refresh so I could play around with the new additions and I'm no longer encountering the bug, even on firefox. I think the "white screen" bug is fixed now and you just need to hard-refresh to download the fixed JS instead of using the cached one. (same person as 172.70.163.31 and 172.70.162.38) [[Special:Contributions/172.70.86.16|172.70.86.16]] 11:16, 8 April 2024 (UTC)

==New Category: Ball Pit?==

What do you think about a new category for comics with [[ball pits]]? [[150]], [[219]], [[485]], [[498]], [[2916]]? [[Special:Contributions/162.158.134.229|162.158.134.229]] 21:50, 7 April 2024 (UTC)

[[:Category:Playpen balls]] already exists.
[[Special:Contributions/172.70.174.133|172.70.174.133]] 17:35, 9 April 2024 (UTC)

== Prism Use? ==

Can the prism be used to sort balls by color? (or in any other way that is useful and different?) [[Special:Contributions/172.68.34.61|172.68.34.61]] 12:11, 8 April 2024 (UTC)
:From what I've seen, no. Though may be ''extremely'' susceptible to incident angle. As far as my own use has been, they seem to randomise the trajectory (possibly also do a total-internal-reflection, I've had balls bounce around and exit at ''really'' weird angles), but it's hard to collimate a feed of balls into a single exact track, even straight down from a ceiling-feed (if you have a ceiling feed directly over the floor exit, lucky you, it'll still occasionally perturb balls off to the sides just enough to be bounced out as a gate-miss, unless you add 'funnel' architecture of one kind or another). Oh, and when balls do a lot of 'internal bouncing' it often forced me to reload the comic (overloaded the physics engine?), so could not continue to tweak the same design.
:On the other hand, perhaps this was the ''intent'', and just code/browser failings made it work erratically. Maybe would be an idea to go back and retest for this (anybody who can), do a little !!science!! to be recorded and explained on the page. [[Special:Contributions/172.69.43.183|172.69.43.183]] 12:51, 8 April 2024 (UTC)
:So, ive did some testing and found..nothing. i ''did'' find some uses for the prism though. Like outting them diagonally makes the balls follow a "path", speeding up more and more (not really that great but it works with yellows), and that any ball hitting the left edge will try to go the the right edge. Not sure what else it can do, though. [[User:Begocc|Begocc]] ([[User talk:Begocc|talk]]) 09:35, 10 April 2024 (UTC)
::I did some thorough testing on a combined Red/Blue set of balls (carefully managed so that they were dropping into the target area as similarly as possible) and both rotated and moved the prism in various ways to check for any effects - like needing to enter parallel/perpendicular to the colour-bands, either to land on the 'target band' or start to pass across it, with the band then either facilitating or angling its 'fall through'. (Just visually checked, at first, then later adding 'buckets' below and to the sides, to try to catch balls departing on various trajectories in various 'clumps' making note of any that hit the 'bucket'-boundaries and bounced off elsewhere.)
::I found no significant sorting, and some balls would jitter around so much (within the prism) that they even launched almost straight back up where they came from (less poerfully than a Bonk-buffered ball, but not far off - also not reliable enough to use as a ball-elevator).
::In my experience, Yellow-sorting is easy (even against Blue and/or Red) by other means. Green is the easiest to have everything else sorted ''from'' (because it resists the fan method). The hardest to unmix are Reds from Blues, which one might think ''should'' be the most prism-differentiated but I'm afraid I just can't invoke that. Easier to have them fall a long way then bounce off a suitable bit of 'furniture', I can then get them to distribute ''fairly'' distinctly in two handy recepticles/onward-feed-hoppers, though it does need some careful placement of items to do it justice. It appears that none of my designs have made it to the 'public wall', but I have made a submitable machine or two that does such sorting sufficiently successfully to send it out (theoretically) to be seen. [[Special:Contributions/172.70.163.30|172.70.163.30]] 11:38, 10 April 2024 (UTC)

== Bugs and Exploits ==

You can use a sword to break the physics on the hinge thingy and create your very own "magnetic hill": https://imgur.com/a/IRZ0AlL [[Special:Contributions/162.158.134.108|162.158.134.108]] 13:02, 8 April 2024 (UTC)
:Hard to tell from that what other fans (perhaps) you've got completely off-clip.
:Those hinge-thingies can definitely be shifted by horizontal (outwith ball-weight pressures), but I've not found them to be reliable components as the "Stop" button (ball reset) seems to let those 'hinges' slring back to level, which might need a re-reset by moving them back past the thing that's holding them off-level.
:I have tried a few things with them:
:*'Ticker' mechanism, almost like a clock escapement, nudged by the rotating 'waterwheel', perhaps to try to release balls through a stream of other balls whilst keeping the path clear of collisions for each set, in turn.
:*'Batch dumper', accumulating a number of balls (above the 'hinge', behind a vertical bulkhead) until there's weight enough to 'open the hatch' and roll them out. (Again, an attempt to reduce collisions, by clumping batches together).
:*Finely configured inclines, by shoving something up into a free end of hinge with better angular resolution (but, as mentioned, this doesn't seem to want to 'hold', so probably would fail upon submission).
:...I had wondered if there was supposed to be a "falling anvil creates a catapult/ballista" idea behind the piece, but we don't ''have'' falling anvils (and definitely not in a repeating manner), and ball-powered catapult (esssentially "clown/acrobat jumps on one end of seesaw, clown/acrobat on other end flies up into the air") also doesn't seem practical.
:I'll try to recreate ''your'' design, work out if there's anything new about it, but right now looks like it's a fan-powered incline-raiser. [[Special:Contributions/172.70.162.38|172.70.162.38]] 14:23, 8 April 2024 (UTC)
:: No fans! Here's a wider view: https://imgur.com/a/xPJcsor
:: It survives the reset, because the balls falling on the lever push it down to the sword and it gets stuck there every time. But you need to place the sword just right to make the gravity bug happen. And even then it depends on the number of balls in some ways. [[Special:Contributions/172.68.243.27|172.68.243.27]] 14:46, 8 April 2024 (UTC)
::: I've replicated the "tip of sword grabs the 'hinge'" thing, which is very interesting, but not the anti-gravity effect. The movement still seems ''to me'' more like a fan's 'area of effect' thing, than a wonky sense of gravity, the way that the balls are rolling/resisting/interacting with each other. No, I can't see where you've 'hidden' the fan (and I'm sure that fans can't act across submission-grid-boundaries, which was my next guess), so it's a bit of a funny thing that you've got there. [[Special:Contributions/172.70.163.49|172.70.163.49]] 21:35, 9 April 2024 (UTC)

On occasion, two balls will fall from the containers as a pair, as if glued together. When this happens, they float down as if under much lower gravity, and then suddenly explode violently away from each other.[[Special:Contributions/172.69.43.182|172.69.43.182]] 10:56, 10 April 2024 (UTC)
:What contaniners?? [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)
::At the bottom of the grid are four containers that the balls are fired in to, from where they drop in to a pit with a boat.[[Special:Contributions/172.70.162.38|172.70.162.38]] 08:40, 15 April 2024 (UTC)

When the browser is running slowly, sometimes the chamber doors will open, but none of the balls in them will drop, which can lead to huge backlogs of balls building up. However, there appears to then be a limit to how many will dispense in one opening - only half a dozen or so layers are released before the door closes again.[[Special:Contributions/172.70.163.31|172.70.163.31]] 12:01, 24 April 2024 (UTC)

== The USS Buoyancy ==

Guys. The Buoyancy. She ''floats''. When all four sets of balls reach the ball pit there aren't further additions. The boat starts floating on them. I've been watching it for a while. It seems she moves left and will probably end up escaping the ball pit. [[User:DL Draco Rex|DL Draco Rex]] ([[User talk:DL Draco Rex|talk]]) 20:44, 8 April 2024 (UTC)
:Update: A new row spawned in and it reset just before the Buoyancy could escape. Here's a screenshot I grabbed a while before the reset, she'd moved further left by the time the reset occurred. https://imgur.com/gallery/8UCASCu [[User:DL Draco Rex|DL Draco Rex]] ([[User talk:DL Draco Rex|talk]]) 20:51, 8 April 2024 (UTC)

Alright, I'm almost 100% of the time seeing Buoyancy sink. Yes, she *floats* at first. But as she drifts to the sides, instead of yellows going underneath, reds and greens pile on top. Then, as the balls under expire (90 second timeout), she will start to sink. Very consistent behavior over time.
[[User:Keybounce|Keybounce]] ([[User talk:Keybounce|talk]]) 19:20, 11 April 2024 (UTC)

What is the Bouaancy i cant find it anywhere??? [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)
== Added key combinations, found in source ==

ctrl+alt+b
ctrl+shift+option+d
wheel: arrow keys

: Can you clarify what "option" is? I have tried alt, function, and "operating system", and none are doing it.
::It is alt [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)

== Fixed Number of Possible Machinelets? ==

I was resetting my browser to try and find new machinelet configurations, but there seem to be fewer and fewer as the game progresses. Hypothesis: the 'under construction' machinelets are set, and once one of them gets approved and added to the grid, that specific configuration of entrances/exits can't show up again.

== Advanced components? ==

How does one get access to the full set of components to build from? I'm only given planks, mallets, swords, scoops, anvils, bricks and fans. I never get any pillows, bumpers, cats, stick figures et cetera. Do they need to be "unlocked" through some achievement, or what? [[Special:Contributions/162.158.222.102|162.158.222.102]] 11:04, 9 April 2024 (UTC)

:This caught me for a while as well. I have since discovered that the tool box has a scroll bar and can be scrolled down; that's where the others are hiding.
::Invisible scrollbars – every GUI obfuscator's favorite tool for making users' lives harder. [[Special:Contributions/162.158.222.142|162.158.222.142]] 18:17, 9 April 2024 (UTC)

== Limit of 100 components? ==

Has anyone else seen this? At some point I started getting a count "95 / 100" towards the bottom of the toolbar. When it hits "100 / 100" the rest of the toolbar greys out, and I can't add anything more. (I suppose the physics engine has to keep a ceiling on the number of possible interactions between components.) —[[User:Scs|Scs]] ([[User talk:Scs|talk]]) 11:53, 10 April 2024 (UTC)
:Yes, quite early on I was dealing with a quite simple 'drop from ceiling straight down to floor' setup. After adding just enough 'funnel' to deal with 'splatter', I then built a castle wall in the open space just to make it fun (with some figures on/below it, that I've also tried to decorate in later submissions), of the 'grey blocks'.
:I actually hit the 100/100 ''exactly'' as I placed my final intended block. (No doubt that it's easy to hit the limit by just overlapping things so you can't see most of them, and other 'useless' placement, too...) [[Special:Contributions/172.70.85.48|172.70.85.48]] 19:57, 10 April 2024 (UTC)

== uss boyancy ==

Why have i not been seeing any uss boyancy [[Special:Contributions/172.70.110.122|172.70.110.122]] 14:04, 10 April 2024 (UTC)

Haha I dare you to go to https://xkcd.com/2916/#xt=7&yt=57 and stare at the two black holes next to eachother >:) [[User:Z1mp0st0rz|Z1mp0st0rz]] ([[User talk:Z1mp0st0rz|talk]]) 15:27, 10 April 2024 (UTC)

== Build a "working" machine from parts? ==

Has anyone started working on this idea:

Since any given machine segment seems to be saved, even if not in the final result, *and* since these segments are failing when combined in the whole, how about a "really working" machine that starts replacing failing segments when they jam or otherwise fail to work in the real machine?

The idea being something like, start the machine. Watch the top row, and see where the parts are failing to pass balls properly after two minutes. Replace the segments that are failing/jaming/etc, and let the new part process balls.

As you work your way down, over about 2 hours at the current size, you will eventually get a machine that properly sends balls down to the bottom, without jamming, without having to "pretend" that off-screen parts are working.

I mean, it's not like a gigantic, 600 segment machine will overflow memory on modern 32gb systems, nor consume so much power that these big huge CPU's will fail, right?
There is a 100 piece limit sadly
[[User:Keybounce|Keybounce]] ([[User talk:Keybounce|talk]]) 17:41, 10 April 2024 (UTC)
ps.: Why do white holes, black holes, prisms, etc, cause problems on some machines like mine and not others?

== Foreshadowing ==

I think that this Machine comic / game is foreshadowed by comic # 2785 titled Marble Run. {{unsigned ip|172.70.130.120|22:15, 11 April 2024}}

== Implementation? ==

Should we have a section on how this thing is implemented? How much is known? Obviously it's hugely dependent on [https://rapier.rs/ Rapier], as credited in the header text. I assume everything else is written in {{w|Rust (programming language)|Rust}}, too. But how is it deployed? Does Rust compile to {{w|Web Assembly}}, or what? Under Color Routing, our explanation mentions that the ball "values were extracted from the code" — how much of the code is actually visible? —[[User:Scs|Scs]] ([[User talk:Scs|talk]]) 16:39, 12 April 2024 (UTC)
:There are source maps available for the client side. So most of the client source is pretty much there an available. DevTools will load these maps automatically by default, and you can find the ball parameters under incredible/src/components/widgets/Balls.tsx. As for the server, it has a Server header of Warp/3.3.31, a web server used for WAI applications in Haskell. [[Special:Contributions/172.70.114.44|172.70.114.44]] 13:37, 14 April 2024 (UTC)
::The source is available at https://github.com/xkcd/incredible --[[Special:Contributions/172.68.253.130|172.68.253.130]] 17:58, 17 May 2024 (UTC)

== XKCD Prize ==

I propose the award of "Good Job" trophies for answers to the following weighty questions:

Cells ...

:C1. There is always at least one entry-exit (same color) pair. I have seen up to five pairs. Is there a limit?

:C2. I have never seen a two-color entry or exit, in over 100 tries, but I have seen pictures posted of this case. How rare are they?

Entry points (where balls enter the cell) ...

:E1. The entry rate varies randomly. Is there a limit to the range of time between two balls?

:E2. Some entries produce balls much faster than others, forever. Does this depend on color? Location? Anything else?

Exit points (where balls leave the cell) ...

:X1. At exits there is a display indicating x or check, and a ring meter showing progress towards check. Eating the wrong color reduces the ring score. By how much? Is it the same amount as is gained by eating the correct color?

:X2. The ring countdown starts about 4 seconds after the last ball, and lasts about 10 seconds. Does this ever vary?

Object properties ...

:O1. The pillow clearly absorbs energy. What other objects have variation in bounce, and how much? By sending a stream of green balls at high speed into targets, it can be observed that the brick and the shot glass (outside edge) are more bouncy than the anvil, which in turn is more bouncy than the plank. Are other colors (such as red) affected the same way?

:O2. Does the bounciness of any objects vary over their shape? The head of the mallet seems a little bouncier, but it's hard to set its angle to precisely match other test objects. The shaft of the pivot thing seems to be sticky. The dead edges of the triangle bonkers seem to absorb all inward energy from green balls, but only some energy from red balls.

:O3. Do the bonkers give a constant exit speed, or does it depend on something like the arrival speed or ball color? Does the exit speed replace the entry speed, or are they combined somehow? Like the dead edges (see O2) I suspect the live edge also absorbs inbound energy before it fires, so the outbound energy may be constant, though maybe not for all colors.

Cats ...

:K1. Over what range and direction will the cat swat at a nearby ball?

:K2. Does the cat always add the same amount of energy when swatting a ball?

:K3. Does the cat always add energy in the same direction when swatting a ball? At first glance the direction seems to be random over a range of angles, but this may be due to random entry points, speeds, and directions for the balls, rather than due to randomness by the cat.

:K4. Is there a rate limit for how often the cat will act?

Black holes and Repulsers ...

:B1. At their default size, repulsers are much stronger than black holes. How much stronger?

:B2. How does effect scale with distance? Are black holes inverse-square? What about repulsers?

:B3. Is there frame dragging around black holes? (good luck :)

:B4. At an exit, does the rate of ring decay slow down if a black hole is nearby?

Bonus observation: Black holes have large solid centers. A red ball stuck to a black hole can be seen bouncing off the center.

Spoiler for B1 and part of B2: If five default size black holes and one default size repulser are all placed at the default center, they seem to cancel out exactly, at all distances, though the solid centers still repel direct collisions. So the ratio is 5:1 and the distance equation (whatever it is) seems to be the same for both objects.
[[Special:Contributions/162.158.167.94|162.158.167.94]] 15:53, 14 April 2024 (UTC)

: C1: Current (as of y=70 filled) maximum across the machine is 5 pairs, only occuring 5 times, so I suppose it doesn't go higher. C2: So far there are only three combined gates in the machine, all two-color: one between (3, 8) and (4, 8) and two between (6, 50) and (7, 50). So yes, they are very rare. [[Special:Contributions/172.70.250.206|172.70.250.206]] 21:38, 14 April 2024 (UTC)

:Re. X1, I'm pretty sure (but don't have evidence, that the answer is 'no - a bad ball reduces it by more than a good ball increases it'. I can also think of an X3 - Does a good ball always increase the counter by the same amount; does this vary by colour or anything else? [[Special:Contributions/172.69.195.229|172.69.195.229]] 08:47, 15 April 2024 (UTC)

: E1: In the machine there is a value called ms_per_ball. Its value is 1000. Ie, a ball should be spawned every 1 second into the overall machine per entry. [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
:: Measuring five random new puzzles, I found most entries deliver 1 ball per second, or almost that much. But I found one green entry that only provided 1 ball every 2 seconds (15 in 30, forever). When I delivered those green balls to the green exit point, I found the ring meter there filled up twice as much per ball consumed. Later I found a red entry that produced only 8 balls in 30 seconds, forever. Those red balls also filled the red exit ring meter much faster than usual. [[Special:Contributions/172.69.134.17|172.69.134.17]] 12:51, 8 May 2024 (UTC)
: K1: There are 3 collision zones defined for the cat swat: The head, its butt & a zone in front of it ("swat sensor"). [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
: K2: Yes. There is in fact a hidden property called catMass. Its value is 2. I am not aware of any machines which submitted a different value. I have submitted my own (sadly not accepted) with stronger cats (a higher catMass value). [https://incredible.xkcd.com/folio/02092fc5-9e23-5468-990e-fba7d67d82c6 Here's an example]. This value is multiplied by 8 and then divided by the minimum of inverse mass of the ball or JS' Number.MIN_VALUE. So to answer your question: yes, it is the same, unless this value got altered (through external methods) and depending on the ball type. [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
::I observe the cat imparts the same velocity to yellow balls and to green balls. The green balls weigh about 30x more than the yellow balls, so I think for "same energy" the answer appears to be no.[[Special:Contributions/162.158.167.28|162.158.167.28]] 15:29, 24 April 2024 (UTC)
: K4: A cat will at the fastest swat every 200 ms. However up to another 400 ms are added by random. So the limit is a range from 200 to 600 ms. (Simplified, there is a period called "baby jail" where the cat has stopped the 'swat' animation but still cannot swat a new ball. This time is included in the previous calculation.) [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
: C2: After trying well over 200 reloads, I obtained a cell with three entries (inputs) and four exits. One of the entries produces both blue and red balls, at different rates. [[Special:Contributions/172.69.134.17|172.69.134.17]] 12:47, 8 May 2024 (UTC)
: E1, E2, X1, X2 and X3: The example link posted above regarding K2 is very enlightening. It reveals (in JSON) that entries and exits have assigned speeds called "rate"s (partly addressing E1, E2, X1, X2 and X3). Rates range from at least 0.55 to 0.76 (maybe balls-per-second, and maybe up to 1.0). It also reveals the items we add are "widgets" and they each have names such as "board" and "catswat". Also the entries and exits are called "inputs" and "outputs", and the balls have types including 1 and 2 which probably correspond to colors. Further review of such examples could be used to update and harmonize the main explanation. [[Special:Contributions/172.69.134.16|172.69.134.16]] 12:53, 8 May 2024 (UTC)

== Submission Rules ==

Has anyone had any luck determining what the rules for submission are? Like many others, I've submitted a few that I've taken painstaking care to get right only to have them disappear after the refresh, never to be seen again. At first I assumed it was first come, first served, with the first submission getting included, but I'm not so sure.

I took a look at the "[https://pastebin.com/jN5MP2za first 42]" versions that someone provided above, and noticed:
* The very first submission, "Pretty Bad" at (0,0) is still there.
* The second submission is "Don't Forget to Switch Your Fans" which is actually (7,0). It's also still there.
* These are followed by "sword" at (2,0) and "Fred" at (1,0), also still there.
* Next is "Pinball Bouncer" which is actually (0,1).
* Next is "undercomplicated". However this is then replaced by "OnlyFans" which is then replaced by "popcorn". "popcorn" appears at (3,0) and is still there.

What caused these to be added, then removed/replaced if it's first come, first served?

I also noticed over the weekend that I was getting assigned blocks that weren't even in the machine yet. I had rows 67 and 68, and the machine was only on row 65.

Also, I did two on row 68, then one on row 67.

None of these got added, which I assume means that someone else completed them before me, BUT that I started before they finished, otherwise I would hope I wouldn't have been assigned one that was already done.

Just now, I created one for a simple red-in, red-out at (7,73). I completed and submitted it. Then I refreshed and hit the edit button a few times and after a few tries I got another red-in, red-out with the input and output at the exact same place. I threw a couple of boards into it and submitted it and it showed it at the exact same spot, (7,73). So I was able to create a new one for the same spot I had already submitted one. I feel like this implied it's not first come, first served, as if so, why would it allow more people to submit for the same spot that someone had already successfully submitted? FWIW, the lowest row on the actual machine at this point is 70. [[Special:Contributions/172.70.134.54|172.70.134.54]] 15:16, 15 April 2024 (UTC)
:: The criteria is not known yet. But it seems you are supposed to be able to make multiple submissions per specific cell / puzzle type (there is a list of puzzles sent to the client, when you submit one, the server picks a position which fits that puzzle.). Then one seems to be chosen manually for a specific cell. There are times of day when the machine is being updated very often, and other times when nothing happens for a while, indicating it is likely a manual process. When a puzzle is added to the grid, the value `snapshot` is populated under its corresponding /folio/ URL. Otherwise it is null. The submission time does not seem to have an effect on if your machine would be accepted. [[Special:Contributions/172.68.195.183|172.68.195.183]] 18:29, 15 April 2024 (UTC)
:It's not simply the first submission, because then we'd see many more simple solutions. Most of the trivial cells get artistic designs and overcomplicated contraptions, which take longer to build and would have lost to simpler and quicker solutions. It's not always the most elaborate contraption, because there are a few really minimal solutions where surely someone else submitted something more complex. It's often not the most correct solution, because many designs get clogged quickly or lose many balls, and I've seen some good solutions get replaced with ones that mis-sort many more balls. It's not always a bad solution either, because there are some that work really well.
:It's possible that the server collects submissions for a while and then chooses one at random. It's also possible that the selection is manual, or maybe the manual step is just a final approval to ensure that no hate speech or other garbage gets in.

man I love messing with the hinges lol [[Special:Contributions/172.70.54.165|172.70.54.165]] 18:49, 18 April 2024 (UTC)Maxalon

==Is the Machine now 'complete'?==

For the first time, I'm seeing a machine with no 'under construction' cells. Do we think it has now stopped processing new submissions (despite still having the option to build them)? [NB - even with all the bottom row cells providing balls to the chambers, the Bouyancy is still only reaching the side of the pit and then sinking.][[Special:Contributions/172.70.91.146|172.70.91.146]] 11:57, 24 April 2024 (UTC)
:On the contrary, here. I submitted some machines. (Even did a hard-reload of the page, between them, in case I had to 'update' the scripting behind it.) I get my solution placed at the bottom layer (in once case, it had a "chuck across to the ball-bins" pipe, though nothing got sent across to the ball-bin/no activity was happening in the ball-pit and there's no USS Bouyancy floating around, in another, it just went into nothing) but I'm ''surrounded'' (to the sides, and above) with Under Construction Tape machine-cells. In one example, I had to scroll up 19 layers before I hit any actual machines (in another, it was well into the 20s, but I lost count).
:Latest submission was [https://xkcd.com/2916/#xt=9&yt=65&v=896 this one], didn't keep a note of the immediately prior ones. Not sure what it looks like from anybody else's perspective. (Nor [https://xkcd.com/2916/#xt=9&yt=66&v=896 a] [https://xkcd.com/2916/#xt=8&yt=69&v=896 selection] [https://xkcd.com/2916/#xt=10&yt=67&v=896 of] [https://xkcd.com/2916/#xt=1&yt=72&v=896 those] [https://xkcd.com/2916/#xt=1&yt=71&v=896 that] [https://xkcd.com/2916/#xt=5&yt=69&v=896 I] [https://xkcd.com/2916/#xt=1&yt=72&v=896 noted] previously... And given that there are two "xt=1&yt=72"s in that list, it looks like I later 'redid' a cell anyway, presuming the "v=896" is my constant UID, as it has never changed since I started to note these things.) [[Special:Contributions/172.69.79.139|172.69.79.139]] 23:30, 25 April 2024 (UTC)
:Postscript: "[https://xkcd.com/2916/#xt=9&yt=65&v=896 this one]" doesn't even send ''me'' to my own just done machine, when I test it! In fact, I'm fairly sure that the one I was linking had green and red (maybe red) balls that needed 'servicing', not the Blue/Red of the "LBC" cell. If not that, it was green, red and blue, but I think that was the one before the hard-refresh. [[Special:Contributions/162.158.33.145|162.158.33.145]] 23:36, 25 April 2024 (UTC)

:Definitely still under construction - it's up to version 1233 as of now. I've been keeping an eye on it - you can see a list of all published machines with permalinks on my [https://github.com/scpso/incrediblexkcd github page] and search for the names of machines you've submitted to see if they ever got published, or download the csv if you want. None of mine have been published but I've still had a lot of fun. [[Special:Contributions/172.68.144.154|172.68.144.154]] 13:27, 27 April 2024 (UTC)

:As of May 23 2024 it looks complete - no "under construction" cells (except during page load). I also notice that the new blank machines on offer for solving have become simpler. Most have only one or two pairs of inputs/outputs now; rarely three. When the page was new it was possible to get four or even five pairs. BTW many of the submissions are very clever, so congrats to those who were chosen. [[Special:Contributions/172.71.158.116|172.71.158.116]] 20:03, 23 May 2024 (UTC)
::Nope, it's still going. [[Special:Contributions/172.69.59.204|172.69.59.204]] 23:35, 26 May 2024 (UTC)
::Maybe the reduction in input/output counts is intentional, to assist in fitting accepted submissions into the machine. [[Special:Contributions/172.69.22.56|172.69.22.56]] 14:44, 27 May 2024 (UTC)
:::I believe it might be complete now. I just submitted one and it replaced one of the existing cells not near the end of the machine. There are no "under construction" cells. [[User:InTheSky|InTheSky]] ([[User talk:InTheSky|talk]]) 09:09, 28 May 2024 (UTC)
::::Just yesterday, I had "construction all the way round" my submission (well, left, right, I was not on the bottom layer and the cell above had yellow tape; did not scroll to see diagonals/further), but I can't test the situation ''right now'', so it might have changed. But I am so used to entries being within a mass of 'taped off' neighbours (and not yet, SFAIK, had a permanent entry into the recurring composite 'board' that lasted beyond the period of submission). [[Special:Contributions/172.70.162.18|172.70.162.18]] 10:09, 28 May 2024 (UTC)

:Getting the machine layout in a JSON form (see above) always revealed a sructure with 128 rows, gradually filling up from version to version. I assume the complete version would have 128 rows filled. --[[Special:Contributions/172.70.246.187|172.70.246.187]] 07:54, 4 June 2024 (UTC)
:: Guess you were right, you can no longer play the game, just see the grid. Which is sad. I would still like to play if I had an idea, even without submitting [[Special:Contributions/172.70.162.185|172.70.162.185]] 00:31, 11 June 2024 (UTC)
:::You can still play the game; a bunch of new layouts just got added, including a 5i5o and 3i4o. But it does look like new rows are no longer being added, just put on top of existing ones.[[Special:Contributions/172.69.22.56|172.69.22.56]] 06:20, 13 June 2024 (UTC)

== Balls have spin ==

This is subtle, and hard to see because the balls no visible texture: The balls carry spin. It can be seen, with effort, using green balls (which are heaviest). Rolling down a slope (say, two boards), green balls accumulate spin in the direction they are rolling. Let them drop off the end and then bounce off a brick such that they travel upward, but with very little sideways motion. Then "catch" the balls with a brick just past their apex, when they are moving slowly. If the ball lands on a horizontal brick, it can be seen that the ball will suddenly accelerate left or right based on the spin. [[Special:Contributions/172.71.155.18|172.71.155.18]] 15:17, 1 May 2024 (UTC)
:I will add this to the explanation.[[User:PDesbeginner|PDesbeginner]] ([[User talk:PDesbeginner|talk]]) 03:05, 19 June 2024 (UTC)

The spin is easier to see when the balls have been accelerated by forceful interaction with tangible objects. Multiple precisely stacked bonks, which I use often in my experiments, make balls spin so quickly that they rocket across flat surfaces when they fall on them. I believe in some cases they may be spinning so fast that they float or hover, but I can't prove this. I've seen two different colored balls hovering or moving slowly together, seeming to touch. When they encounter a tangible object, they rocket off in opposite directions. I've seen similar effects with multiple stacked wheels and hinged scoops, which behave chaotically and cause balls to rebound fast enough that in some cases they pass through other tangible objects.[[User:Yusagi Yojimbo|Yusagi Yojimbo]] ([[User talk:Yusagi Yojimbo|talk]]) 19:15, 17 July 2024 (UTC)

== Stacking Objects ==

Stacking certain objects seems to stack their effects. For instance, enough Fans placed directly on top of each other are strong enough to redirect even green balls in mid-flight.

Multiple Bonks create a more powerful bounce, sometimes fast enough to make the ball seem to disappear briefly. These effects can be useful in overcoming certain restrictions and difficulties, or just for the joy of watching balls rocket around.

Stacking moving objects like Hinged Hooks and Wheels creates a completely different effect. Multiple hooks of either handedness - left or right - will lock together and then start to rotate slowly or swing wildly, together or separately, in both directions. Even when the hooks are moving slowly, balls that interact with them will sometime either rocket away or stick to them with a gravitation effect.

Combining left and right hooks has similar effects, but more than 4-6 of either hook will typically slow the animation, and eventually freeze it completely.

More Wheels can be stacked than hooks, with numbers in the dozens still allowing the animation to proceed. They will act in a similar fashion, sometimes locking and sometimes spinning wildly. Balls that strike them will be projected away at high speed, sometimes disappearing, or reappearing in a different section (a round Bonk will often flash briefly with no visible interaction).

Other interaction include sucking the ball into the interior of the wheel, where it sometimes disappears, or clinging to the surface like a gravitational attraction. The more Wheels, the more likely that the ball will simply disappear.

These techniques create interesting chaotic environments in the cell, but make it difficult to meet the ball feed requirements for submission. With multiple inputs it becomes effectively impossible. One work around is to separate streams for the balls at the source, protecting one stream to feed it into the output while allowing the rest to interact with the chaotic object. This is easiest with a single input at the top of the cell, but is still possible with one or more side inputs, depending on the location of the outputs.

The easiest way to stack hooks is to leave them at the spawn point and spawn more on top. Moving hooks and stacking them manually makes it hard to realign them perfectly to get the chaotic interaction, although they will still interact in unexpected ways. Wheels however can be effectively moved and stacked manually.

Adding another object on top may freeze the movement if the object is large large enough. A brick or a round Bonk will not significantly affect the Wheel, nor will a Black Hole or Repulser, but a Board, which extends beyond the Wheel, will lock it in place. The chaotic effects remain even when the wheels aren't moving - the balls seem to react as if they were spinning at high RPMs. [[User:Yusagi Yojimbo|Yusagi Yojimbo]] ([[User talk:Yusagi Yojimbo|talk]]) 17:22, 6 May 2024 (UTC)

I've been playing with creating machines that satisfy the requirements to be submittable but allow me to make changes at the last second - after getting an active "submit" button but before submitting I make a change that would technically make it unsubmittable because it basically becomes a chaotic system. The most recent was a stacked mass of ships wheels directly below the sole entry for one color ball. I placed a plank above the wheel to direct the balls to the exit point on the lower border. When I got the submit button to activate I deleted the plank, and clicked the submit button. Even though it immediately became "unsubmittable" I was still able to name it and submit it, where it took its place in the machine grid. The stack of wheels spun at blindingly high speed, and flung the balls around madly. I noticed that some actually pierced the walls and appeared in adjacent machine cells. High energy physics at work! {{unsigned|Yusagi Yojimbo|03:08, 14 September 2024}}
:Now, this is part of why I feel I have to add a "colour-filter" step in almost anything I do (hard, when only some colours appear in 'design mode', to scoop up and test being mixed in)... The number of times a placed submission gets wildly wrong 'inputs' from the prior submitted machines' outputs (that ''sometimes'' I can resolve, but without knowing the actual needs until too late to account for them). [[Special:Contributions/172.70.163.48|172.70.163.48]] 05:32, 14 September 2024 (UTC)

== Wheel/Fan page crash ==

If you place a fan close to a wheel, such that the middle of the fan is about in line with the bottom edge of the lower wheel blade, and the fan blades are just barely touching the wheel blade, then the wheel accelerates apparently without bound. Eventually any ball that touches the wheel simply disappears from the page. Around 20 seconds later (as the wheel continues to accelerate apparently) the page crashes upon the next ball impact, with a javascript error:

<pre>Uncaught RuntimeError: unreachable executed
stepWithEvents rapier_wasm2d_bg.js:2726
step physics_pipeline.js:16
step world.js:111</pre>

At that point you lose your creation, which sadly I learned the hard way. This is fairly easy to reproduce. --[[Special:Contributions/172.71.166.206|172.71.166.206]] 01:23, 7 May 2024 (UTC)

I can't seem to get this to work. It could be because I'm dumb, though. That happens sometimes. [[User:Psychoticpotato|Psychoticpotato]] ([[User talk:Psychoticpotato|talk]]) 00:00, 14 May 2024 (UTC)

https://imgur.com/a/EhzlbCV --[[Special:Contributions/172.68.26.74|172.68.26.74]] 13:48, 15 May 2024 (UTC)

== Another glitch ==

Some pairs, like "xt=6&yt=124" and "xt=7&yt=124" cause a glitch. It is not related to the machine, for it is consistent for me (Fx 126.0.1, Windows 11). Does anyone else have these issues? [[Special:Contributions/172.70.34.11|172.70.34.11]] 19:02, 7 June 2024 (UTC)

Yes the live huge machine is crashing very frequently now. If I scroll around it will crash and just freeze permanently. I can't tell which panel or panels is causing the crash though. Maybe it's just gotten too big? [[Special:Contributions/172.69.64.240|172.69.64.240]]

== Yet Another glitch ==

If you press a ball against the wall it clips out kinda cool {{unsigned|Xkcd machine guy|09:39, 16 June 2024}}
:You can observe this with pressing balls between (solid) elements, too, having placed one item (or more) then shifting a further one into contact with the prior(s) with a ball already landed there. (I ought to try it with two 'cups', mutually inverted, trap a ball in one then move either straight across the other.)
:It's often useful to (temporarily) clear out a system jam by sweeping the balls around with a throwaway object, but also you can force their time-outs by making their existence untenable (after some scene-editing that temporarily sent streams in totally in the wrong direction). [[Special:Contributions/162.158.49.94|162.158.49.94]] 14:04, 16 June 2024 (UTC)

== Entirely broken? ==

I can no longer play the game (have tried on two different computers, repeatedly for the last 24 hours). Starts out in the machine view, the machine freezes immediately, and there's no edit button. -- [[User:Rei|Rei]] ([[User talk:Rei|talk]]) 22:10, 21 June 2024 (UTC)

Same here. If you scroll (drag) to view the bottom (USS Buoyancy), balls will move there, but there's no "Edit" button. [[Special:Contributions/172.71.159.7|172.71.159.7]] 23:14, 21 June 2024 (UTC)

Also for me. Chrome and Firefox, balls traverse the bottom chamber and float the boat, but as soon as the bottom row of machines are within view, no balls spawn or move. I only just saw this comic today, which appears to be the day it broke, so... I've never seen it running. Came to Explainxkcd to see if it was just me, and here we are at the very bottom, not feeling buoyant. [[Special:Contributions/162.158.167.76|162.158.167.76]] 05:35, 22 June 2024 (UTC)

Is it possible it will eventually be fixed? {{unsigned ip|162.158.175.151|13:44, 24 June 2024}}
:Many things are possible! [[Special:Contributions/141.101.99.34|141.101.99.34]] 20:55, 24 June 2024 (UTC)

I opened [https://github.com/xkcd/incredible/issues/3a ticket on Github]. A day later it was fixed, so I assume that was the trigger. Yeay! :) -- [[Special:Contributions/172.69.144.162|172.69.144.162]] 11:14, 25 June 2024 (UTC)

Talk:2982: Water Filtration

2024-09-08T11:35:32Z

172.70.163.48: Meta discussion.

On the activated carbon filter, that's a double entendre, referencing both activated charcoal filters often used in filtration systems and the nearby neutron source, which is radioactivity activating the carbon. [[Special:Contributions/172.71.254.23|172.71.254.23]] 04:32, 7 September 2024 (UTC)Corsac

There are a bunch of processes shown that are real, but not actually used in water filtration. For example, electrolysis is used to make hydrogen and oxygen gas, and reverse electrolysis is used in fuel cells to produce electricity, but the electricity cost of doing these steps to purify a useful amount of water would be prohibitive. [[Special:Contributions/162.158.159.14|162.158.159.14]] 06:18, 7 September 2024 (UTC)
:On the other hand, it would be a kind of "extra-intense distillation". We already basically have been "distilling water", as I see it, with the autoclave/condenser pairing that would certainly leave any remaining dissolved minerals or particulates behind. By splitting then recombining the component elements (and some basic gas-chromatography process, not shown) then you'd inarguably get water out that's about as pure as you can hope for in even the most {{w|The Waters of Mars|paranoid fantasies}} about the need for clean water.
:...of course, here it's not even the ''most'' energetic attempt to further 'refine' the components of "watery matter", with the assumed luxury of having energy (and indeed water) to burn... [[Special:Contributions/172.69.194.219|172.69.194.219]] 06:39, 7 September 2024 (UTC)
:Yes; I'm wondering if we should be a bit more specific than just "real" vs. "fake". Some of the processes would work, but wouldn't make the water purer; some are impractical but feasible; some aren't possible at all. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 16:10, 7 September 2024 (UTC)

Regarding condensers: Condensers are a real method of purifying water, although perhaps not commonly used to demineralize household well water. I frequently buy "purified" water that has been distilled which is simply boiling the water and then condensing the steam into pure water. This is great for use in tea pots or egg cookers or humidifiers to avoid mineral buildup inside the pots. [[User:Rtanenbaum|Rtanenbaum]] ([[User talk:Rtanenbaum|talk]]) 14:35, 7 September 2024 (UTC)

Regarding adding the well-water back in at the end: "Purified" water is often sold in the baby aisle for use in mixing baby formula, but the labels indicate that minerals have been readded to the water, which of course means it is no longer pure, and would not be useful if I want to avoid mineral buildup in a tea pot. [[User:Rtanenbaum|Rtanenbaum]] ([[User talk:Rtanenbaum|talk]]) 14:35, 7 September 2024 (UTC)

This comic made me realize how to fund space exploration: selling "artisinal space water" to gullib- I mean, discerning rich people. [[Special:Contributions/172.69.246.151|172.69.246.151]] 15:48, 7 September 2024 (UTC)

I have silt, iron, manganese, and microbes in my well.

In a real life, the first step will be mechanical filters: frog-screens, leaf nets, sand or paper media. In my well-water this takes most of the yuck out (as brown sludge).

Home-scale UV treatment is commonly sold (and apparently used; spares available) for spot-treating rural well water. Industrial UV exists for very expensive 'pure water' which must not make anybody sick. ALL water gets germs; UV may have less side-effect than Chlorine or Bromine.

Condensing (and distilling!) are standard household appliances for DIY distilled water. 'Activated' Carbon elements are VERY widely sold for taking taste/smell out of tap water.

"Water softening" (several types) is bog-standard technology out beyond the city mains. ([[User:PRR|PRR]] ([[User talk:PRR|talk]]) 19:08, 7 September 2024 (UTC) ...cntd below)
:Please sign your comments. And yes, it is. But not immediately before filtering by reverse osmosis. Reverse osmosis should remove almost all solutes, so the resulting pH should be very close to 0 and the concentration of no chemical except water should be significant. Water softening before or after is unnecessary. Don't get me wrong; RO is not perfect. But water softening is only ever necessary to remove large amounts of minerals that can leave scale, and that isn't an issue with high-purity water. [[User:EebstertheGreat|EebstertheGreat]] ([[User talk:EebstertheGreat|talk]]) 08:03, 8 September 2024 (UTC)
::NB, the comment ''was'' signed, if you check. This was fifth of sixth straight 'level zero indented' comments. Personally, if I'm not replying (sitting after any number of ":"s, per line) I prefer to add a <code><nowiki> </nowiki></code>-tag to force the linefeed (that isn't rendered, otherwise), rather than make it double-LF and potentially ''look'' like separate contributors.
::It also helps if it's written to look like it's the same contributor (disjointed paragraphs switch narratives seemingly at random don't help... ''especially''), but it isn't foolproof (and unsigned+signed contributions can look like one slightly rambling contributor, hence why signing does need to be added wherever necesary).
::But it's all in the eye of the beholder, some of whom may be the posters concerned and be absolutely sure that the future confusion won't exist. And sometimes (''very'' occasionally), there'll be a wish to interleave a comment specifically against an 'inner paragraph' of the wider message you're replying to. You can perhaps copy the 'official' signature of the original flow, like I did here. Can get messy any which way, of course.
::Some people might even think it better to (at least in non-reply additions, zero-coloned) just stick to one long rambling no-break paragraph. But I usually find that inelegent both in reading the Talk page and in its edit-source. Being terse and to the point perhaps helps, though, if possible. Not that I'm good at being laconic, as you can see! [[Special:Contributions/172.70.163.48|172.70.163.48]] 11:35, 8 September 2024 (UTC)

Of the radioactive treatments, Radon is not mentioned; surely this kills a few germs?
[[User:PRR|PRR]] ([[User talk:PRR|talk]]) 19:08, 7 September 2024 (UTC)
:Using radon would be a bad idea. Even if one got all of the radon out afterwards (e.g. by {{w|sparging}}), it would leave behind radioactive daughter products, as well as the lead at the end of the decay sequences. Granted, {{w|Radithor|radium-enriched water}} was a commercial product, back in the day, but... still a bad idea. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 21:58, 7 September 2024 (UTC)
::Yeah, the philosophy tended to be "if it fluoresces, it impresses!", in the {{w|Radium fad|pseudoscientific quackery}} of the time... [[Special:Contributions/172.69.79.183|172.69.79.183]] 23:15, 7 September 2024 (UTC)
:Wait ... you have filters which turn frogs to brown sludge? Is that legal? -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 05:24, 8 September 2024 (UTC)
So much that I didn't notice in my first forty minutes looking at the comic while thinking "uhmm wut no! ! !" Y'all are why I come here especially when I think I thought I understood it and didn't need it explained. BTW? Are some for which the explain cannot be complete. The user interactive recent one with squirrels, fans, balls and things that made it kinda a pinball game but most assuredly not (mostly) come to mind. Thank you all. (Edited for clarity}[[Special:Contributions/172.70.43.54|172.70.43.54]] 04:19, 8 September 2024 (UTC)
[[Special:Contributions/172.70.39.34|172.70.39.34]] 04:28, 8 September 2024 (UTC)

Are we talking about water treatment, water filtration, or water purification? Because blending water and using UV are useful tools in water treatment but are not filtration and are pointless for purification. Treatment is anything done to make the water healthier or more pleasant to drink or better for equipment. Filtration requires physical separation of water from contaminants (which would not count most of these processes, and some, such as electrolysis, kinda break the definition water systems use since they separate at too fine a level to really count as a water filter anymore, despite the comic name). Purification is the elimination of anything that isn't water. I thought part of the joke was that it was supposed to be treatment for home faucets for drinking purposes. I wouldn't care except it would change the classifcation of the columns. [[Special:Contributions/172.70.178.122|172.70.178.122]] 10:49, 8 September 2024 (UTC)

1456: On the Moon

2024-09-04T20:21:48Z

172.70.163.48: /* Explanation */ Additional (noting that there is crew overlaps - from memory, there were Lovell, Young and Cernon who successfully went to (i.e. at least around) the Moon twice).

{{comic
| number = 1456
| date = December 5, 2014
| title = On the Moon
| image = on_the_moon.png
| titletext = "I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on Venus and returning him safely to--" [an aide frantically whispers in the president's ear for a moment] "... of landing a man on Venus."
}}

==Explanation==
The phrase "If we can land a man on the Moon, why can't we <blank>" is commonly used to question a perceived shortcoming of government, society or humanity in general. The {{w|Apollo program}} landed {{w|List of Apollo astronauts#Apollo astronauts who walked on the Moon|twelve astronauts}} on the {{w|Moon}} in six landing missions from July 1969 to December 1972 and returned all twelve of those astronauts safely to the Earth, as well as all those who went 'to' the Moon without landing (two orbit-only missions, all crew-members who remained in orbit and the whole crew of the {{w|Apollo 13|mission}} that suffered a critical accident on the way to a proposed landing). However, from 1964 to 1967, there were eight deaths of astronauts or men training to be astronauts: three in the Apollo One fire, four in T-38 crashes, and one in an F-104 crash. The premise is usually that if "we" (whether referring generally to humanity, or specifically to the United States) have been able to achieve this extraordinary feat, our inability to achieve some lesser goal is questionable and/or ironic. Right after the Philae landing, the similar hashtag [https://twitter.com/hashtag/wecanlandonacometbutwecant #WeCanLandOnACometButWeCant] began on Twitter.

Here, Megan cuts Cueball's argument's short by implicitly reminding him that humanity has not put another human on the Moon since the end of the Apollo program in December 1972 (nearly 42 years at the time this comic was published). New manned programs to return to the Moon, such as the {{w|Constellation Program}}, have been repeatedly cancelled. The {{w|Orion (spacecraft)|Orion spacecraft}}, which will be capable of carrying humans beyond {{w|low Earth orbit}} for the first time in over 40 years, executed its first test flight on the day after this comic was published. However, this is outdated, as {{w|NASA}} is planning to go to the Moon again with the {{w|Artemis Program}}. The launch date of when {{w|Artemis 3}}, the mission where humans will return, is planned to be some time in 2025, when this comic would be around eleven years old.

The title text is a retelling of [[John F. Kennedy]]'s famous inspirational [https://www.jfklibrary.org/Asset-Viewer/xzw1gaeeTES6khED14P1Iw.aspx address to the U.S. Congress in May 1961] ("I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the Moon and returning him safely to the Earth"), which set into motion the Apollo program, except that this time, the speaker is talking about putting a man on planet {{w|Venus}}. The aide presumably explains to the president that, unlike Moon, Venus has gravity close to that of the Earth, but what's more, its surface {{w|Atmosphere_of_Venus|atmosphere}} density and pressure, and other factors including high temperature, strong winds and sulfuric acid clouds would make manned launch back to orbit practically impossible at our current technological level. As a result, the president backtracks from the goal of returning the astronauts safely to the Earth and comically limits the aspiration to landing an astronaut on Venus, full stop, without regard to the astronaut's safe return. This differs slightly from Kennedy's goal, which included the safe return of at least one astronaut from the Moon. Although the overall 8:12 ratio of deaths to moonwalkers (during the period for Kennedy's speech to the end of the Apollo program) was too high to be considered "safe" by most standards, Kennedy had specified the safety only of the men who landed on the Moon, and set a goal of "a" man returning safely. Technically, even if most of the men who landed died, as long as one returned safely by the end of 1969, Kennedy's goal would have been met.

Kennedy's 1961 speech was also mentioned in the title text of [[753: Southern Half]].

==Transcript==
:[Cueball and Megan are walking together heading right.]
:Cueball: If we could land a man on the Moon, why can't we-
:Megan: -land a man on the Moon?
:Cueball: ...ok, fair. But we're working on it, OK?

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Space]]

Talk:2979: Sky Alarm

2024-09-02T08:22:35Z

172.70.163.48:

♫♪ Happy Birthday to me, happy birthday to me... ♪♫ :) [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:55, 31 August 2024 (UTC)

I've tried to do just this by subscribing to a channel promisingly named "AstroAlert", which then proceeded to spam me 500 times per day with messages about a random meteor on the opposite part of the world. Woe. [[Special:Contributions/162.158.110.200|162.158.110.200]] 05:15, 31 August 2024 (UTC)
:Hence the need for this alarm, to keep it LOCAL, :) That's the thing, any such thing needs a LOCATION, to limit results to what is locally relevant to each person. :) [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 05:19, 31 August 2024 (UTC)

This comic seems super simple, so I added as muc( explanation as I can think of... [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 05:19, 31 August 2024 (UTC)

Local58 moment 💔 [[Special:Contributions/172.70.85.138|172.70.85.138]] 11:27, 31 August 2024 (UTC)

With that device, no work is ever going to be done again... D: [[Special:Contributions/108.162.221.24|108.162.221.24]] 11:36, 31 August 2024 (UTC)

There is a nice site called [https://apod.nasa.gov/ Astronomy Picture of the Day] that is like this. Alas, it is "A cool space thing happened three days ago - sorry you missed it". --[[User:Divad27182|Divad27182]] ([[User talk:Divad27182|talk]]) 11:41, 31 August 2024 (UTC)

Sounds like it needs a sky dome camera system (like they made for immersive filmimg) on the roof coupled with statistical analysis (mistakenly aka AI) to recognise and record 'interesting' things, coupled with localised alerts for known phenomena. A product for someone? [[User:RIIW - Ponder it|RIIW - Ponder it]] ([[User talk:RIIW - Ponder it|talk]]) 11:46, 31 August 2024 (UTC)

Most cool astronomical events don't come up so suddenly that you need an alarm. We know about eclipses years in advance, meteor showers recur annually, comets have months of warning, and unusual auroras are usually known a few days early. Anything sudden will probably also be short-lived, so by the time you get outside it will be over. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 15:26, 31 August 2024 (UTC)
:If you're anything like me, you're often eager to see (predicable space phenomenon) and then get reminded of it a day too late when the photos starts appearing on the internet. Though that could just as easily solved with a reminder on a standard calendar app, if only you had something reminding youto set up reminders. What would be nice would be an app where you put in your location and it gives you the next week's A) weather forecast, and B) list of interestingly visible space thingies. [[Special:Contributions/172.69.246.142|172.69.246.142]] 14:38, 1 September 2024 (UTC)

Seems like there should be a name for these alerts, like "Amber Alert" for missing children. I nominate "Neil Alert" -- it should probably use Neil deGrasse Tyson's voice. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 15:28, 31 August 2024 (UTC)

Since the characters in the comic are the same as in the previous ISS comic, I like to think that they're in the ISS and Megan is getting ready to do an EVA (ignore the fact that such a desk wouldn't make sense, or the walking, or that prepping for the EVA would probably take well over a full orbit) [[Special:Contributions/172.71.223.93|172.71.223.93]] 17:58, 31 August 2024 (UTC)

Dang, we really cleaned up all the incomplete explanations, didn't we?
Either that, or someone just went around and removed all the tags [[User:New editor|New editor]] ([[User talk:New editor|talk]]) 19:50, 31 August 2024 (UTC)

Does anyone know of anything like this? Something that will tell me about things like upcoming meteor showers, comets, auroras, etc. the day before, rather than hearing about it the day after from people who somehow knew about it? To this day I still have no idea how people find out about these things before they happen {{unsigned ip|162.158.154.134|13:35, 1 September 2024}}
:Offline, the national (and local) Weather broadcasts might give info on "what might be visible tonight". Or at least respond to the preceding News programme's "and finally..." if it features the note that supermoons will happen or aurora have a decent chance to and all that remains is the hope of clear sky. That's UK television, can't speak for wherever you are/what you might watch.
:Online, it would depend upon what you can imagine wanting to know. Keep an eye on something obvious like space.com (which might have internal/external links to gateways that push notifications on various subjects) or go the full hog and search for "aurora alert", "meteor alert", "rocket launch alert" in every sort of phrnomenon that you think might (if timed/located well) interest you and be visible.
:The comic device might be either configured to deal with everything the comic characters might be interested in, nails absolutely ''anything'' (without prejudice/selectability) or perhaps (over time) has an AI/heuristic element that 'learns' what random phenomena most interest you as it collates so many possible feed options (itself, or via its manufacturer's centrally maintained servers).
:But it looks like a project ripe for a 'Maker' to try. Set up an Arduino/Raspberry Pi/whatever with a "speaker/siren and lights" housing and an internet connection with suitably configured feed-scraping commands run within it (or via a separate computer to which it connects) that makes a fuss whenever a suitable notification is passed. Add to that maybe some skyward-facing camera(s) with one degree or other of image-processing applied to their images to (for example) identify when a particularly nice sunset is happening with plenty of rose-tinted clouds. With enough foresight (and the right processing) it could pick up particularly aesthetic cloudscapes, the spontaneous murmurations of starlings, an amusing conjunction of contrails, the first snowflakes of winter or (back to space things) a surprise Earth-skimming bolide... whatever your imagination, technical tinkering and subsequent data-munging could get your "Sky's-Pi Alarm" (or whatever it is) to make its noises for.
:I don't actually subscribe to anything (as proxy for my imagined self-contain/collating device), so I can't tell you any particularly good sources of info, but there'll be some out there. Like you can get earthquake alerts (or at least "yeah, we also know about it, be careful" semi-simultaneous detection), tornado alerts, flood aleets and other hobbyist/public-safety notification systems. [[Special:Contributions/172.70.162.207|172.70.162.207]] 14:58, 1 September 2024 (UTC)

At the moment, a device like this might actually be useful for all of us who irritate their friends and family by going out every evening at around 10 when it's dark but Corona Borealis is still a fair distance above the horizon, because of this [https://www.skyatnightmagazine.com/space-science/t-coronae-borealis-nova nova-in-waiting]. There is a distinct chance it'll be cloudy on the nights it happens anyway, because ''that's reality: always pissing on the epic moment'' ([https://www.goodreads.com/book/show/89186.Pushing_Ice?from_search=true&from_srp=true&qid=cSxwg6qHB1&rank=6 this last part is a quote, here's the source]) As with many glorious celestial events, if you don't know what it signifies, it'll just be another of many inconspicious little dots of light, and if you don't know or care what the constellations normally look like, you won't even notice. It'll still be an awesome once-in-a-lifetime event to watch, but be aware at all times that for all practical purposes (and for so-called "normal" people) the awesomeness is all in your head.* [[User:PaulEberhardt|PaulEberhardt]] ([[User talk:PaulEberhardt|talk]]) 15:30, 1 September 2024 (UTC)
: see [[1644: Stargazing]], [[2017: Stargazing 2]] and [[2274: Stargazing 3]] for further reference. To be honest, I'm actually waiting on xkcd's take on the event as much as on T Coronae Borealis going boom already. [[User:PaulEberhardt|PaulEberhardt]] ([[User talk:PaulEberhardt|talk]]) 15:30, 1 September 2024 (UTC)

I previously changed the words from the alarm in the Transcript to italics, but I wasn't convinced that the noises from the alarm were also italicized. I see someone else changed them to italics as well, but I wonder if anyone else is of the same mind as myself. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 14:16, 1 September 2024 (UTC)
:The transcript shouldn't actually use (or rely upon) formatting, really, though saying something like <code><nowiki>:[The device emits sounds and speech, in italics] ''The things the device says''</nowiki></code> in both description ''and'' markup would satisfy both human and non-human readers better than one method alone. I've not been involved in that transcript, probably won't, but it's the kind of expansion that I'd expect (done with more thought than this quick note, maybe). [[Special:Contributions/172.70.162.207|172.70.162.207]] 14:58, 1 September 2024 (UTC)

'''NOAA weather radio:''' How has nobody mentioned the NWS NOAA weather radio system (162.400–162.550 MHz)? It has both continuous broadcasting of weather information as well as a special system of alert tones that many receivers can automatically recognize and then flag to the user in whatever way. It's kind of like this, except maybe that watches and warnings are about severe weather and not "cool stuff happening." [[User:JohnHawkinson|JohnHawkinson]] ([[User talk:JohnHawkinson|talk]]) 15:51, 1 September 2024 (UTC)

2979: Sky Alarm

2024-09-01T14:13:11Z

172.70.163.48: /* Transcript */

{{comic
| number = 2979
| date = August 30, 2024
| title = Sky Alarm
| image = sky_alarm_2x.png
| imagesize = 332x302px
| noexpand = true
| titletext = During the day it also activates for neat clouds and pretty sunsets.
}}

==Explanation==
{{incomplete|Created by a COOL SPACE THING - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
The alarm's words, and being labelled as "Sky Alarm", shows that this alarm is triggered when something cool to see is happening in the sky, alerting people ([[Cueball]] and [[Megan]] in this case) that they might want to go outside or look out of a window in order not to miss said cool thing. Randall remarks in the caption how he wants this device and wishes it existed. Cueball and Megan (and by extension [[Randall]]) feel that they regularly miss events they'd like to see, so such a device would help prevent this.

The title text further specifies that he would want it even to activate for such simple everyday things as interesting clouds and nice sunsets (which still can be very beautiful). Basically, it would help people not miss interesting outdoor sights.

Randall last referred to cool sky pheomena in [[2971: Celestial Event]]. There have been quite a few of them lately (the {{w|Perseid meteor shower}} and a blue {{w|supermoon}} were both in the past few weeks), so they may be on his mind.

==Transcript==
:[A square device with a light on top and a label on its side, is seen resting on a stool to the left. It is activated and the light on top of it is glowing and a voice is emanating from it, maybe even speaking the siren part of the sound that comes between sentences. Cueball, sitting on an office chair at his desk, looks away from his laptop so he is now facing the device while Megan is on the other side of the desk running away from it towards the right edge of the panel.]
:Label: Sky Alarm
:Sky alarm: ''Weeee Ooooo Weeee Ooooo''
:Sky alarm: ''There's a cool space thing happening!''
:Sky alarm: ''Weeee Ooooo Weeee Ooooo''
:Sky alarm: ''Go outside and look up!''

:[Caption below the panel:]
:I want this device.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Space]]
[[Category:Weather]]

875: 2009 Called

2024-04-26T19:04:17Z

172.70.163.48: /* Trivia */ Removing spoiling pipes from []-links. (Tricky, I know...)

{{comic
| number = 875
| date = March 21, 2011
| title = 2009 Called
| image = 2009 called.png
| titletext = 2017 called, but I couldn't understand what they were saying over all the screams.
}}

==Explanation==
The comic deconstructs a {{w|snowclone}} or common idiom - "X called, they want their Y back." In a common version, the "X" in this phrase is a year, or era, and "Y" is something that was common in that time, but is now unfashionable, or outright ridiculous.

Here, [[Megan]] notices a Three-Wolf Moon T-shirt that [[Cueball]] apparently owns. The {{w|Three Wolf Moon|Three-Wolf Moon}} is a shirt of three wolves howling at the moon that reached meme status when several people posted ironic reviews ascribing supernatural powers to it on {{w|Amazon}} around late 2008. Like many memes, it became popular for a short period, but rapidly became outdated.

Presumably, Megan is trying to say "2009 called, they want their shirt back", mocking Cueball for still owning something so outdated. Before she can finish, though, Cueball appears to take her literally, and responds as if she'd actually received a call from the year 2009. If she'd actually had the opportunity to communicate across time, that would be a golden opportunity to warn the people of the past about events that had not yet occurred. Specifically, he asks if she'd warned the people of the past about {{w|2010 Haiti earthquake|the February 2010 earthquake in Haiti}} and {{w|2011 Tōhoku earthquake and tsunami|the March 2011 earthquake and tsunami in Japan}}, and admonishes her when she admits she didn't. Both of these were events in which huge amounts of human suffering and death likely could have been prevented with foreknowledge.

The comic was posted shortly after the latter disaster, so it is reasonable to assume that it was created as a specific response to what had occurred. It's not entirely clear whether Cueball is preempting Megan's attempt to mock him, or whether he actually thinks the past called.

The title text continues the snowclone by implying a terrible future awaits in 2017. Likewise, non-apocalyptic events, such as political protests, can generate "yelling and screaming". Given the public's general inclination to focus on the negative the prediction of a "bad future" may have worked with any date.

2017 has occurred, and the world hasn't exploded.{{Citation needed}} In hindsight, 2020 would work better for the joke. [insert hindsight is 2020 joke here]

However, 2017 was actually one of the world's most devastating years in terms of natural disasters, for starters, there were Hurricane Harvey, Irma, and Maria: all particularly devastating, for that particular corner of the world. In addition, the election of Donald Trump was upsetting for many people, especially people who did not agree with his controversial beliefs.

==Transcript==
:[Cueball is at computer. Megan is standing behind him, looking at clothes on the floor.]
:Megan: Is this a three wolf moon shirt?
:Megan: Dude, 2009 called, and they-
:Cueball: ''OH MY GOD!''
:Cueball: ''DID YOU WARN THEM?''
:Cueball: ''ABOUT HAITI AND JAPAN?''
:Megan: What? No, I-
:Cueball: You ''ASSHOLE!''

==Trivia==
* In 2013, the webcomic "Bearato Comics" ran [https://nedroid.com/?601 a comic strip] with a joke very similar to the joke in this XKCD comic. After the creator was notified by XKCD fans that he had used a joke already done on XKCD just two years earlier in his comic, the [https://nedroid.com/?602 next comic strip] on "Beartato Comics" then parodied the incident.
See also:
*[[102: Back to the Future]]
*[[1072: Seventies]]

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]

2469: Astronomy Status Board

2024-04-26T13:02:26Z

172.70.163.48: /* Explanation */

{{comic
| number = 2469
| date = May 28, 2021
| title = Astronomy Status Board
| image = astronomy_status_board.png
| titletext = Junior astronomers hate getting put on board update duty, but someone's gotta make sure that stuff is still up there.
}}

==Explanation==
[[Ponytail]] is staring at the sky through a telescope while [[Cueball]] is operating a checklist, visible on a large screen on what looks like a large billboard.

Since they are junior astronomers, they appear to have been tasked with simply verifying whether normal celestial objects are still present in the sky, such as the Sun and the Moon. Only large objects that are clear in the sky (at least at night for those not the Sun). Although all of these objects will eventually disappear it is not expected to happen within the life of the status board. {{Citation needed}}

This is likely a reference to the many "status boards" for online services ([https://portal.office.com/ServiceStatus example], [https://status.cloud.google.com/ another example], [https://forum.suprbay.org/status a different example], [http://hasthelargehadroncolliderdestroyedtheworldyet.com/ a funnier example]). The joke is that it would be funny if there was a status board to check that all the celestial bodies are still there, and that with our modern culture few people are looking directly at the real sky, even though anyone with a telescope and an unobstructed view could just look at the sky to verify for themselves without referencing such a status board. This is compounded by the fact that the listed celestial bodies have existed for billions of years, and are expected to last for billions more, leading one to wonder why astronomers would bother checking and rechecking just to see if they're "still there" with any sort of regularity.

This comic may also be an oblique reference to the study of the projected future of celestial objects given our current understanding of physics. At various points in the future the objects on the billboard may become unobservable from Earth. The Moon is gradually receding from Earth, and when the Sun enters its red giant phase the Moon might be broken up.[https://www.space.com/3373-earth-moon-destined-disintegrate.html] Eventually the Sun itself will run out of {{w|Sun#After_core_hydrogen_exhaustion|usable fuel}} and will go dark as will other stars. Moreover, if current theories of dark energy and universal expansion hold, the acceleration of the universe could push galaxies beyond the {{w|Cosmological_horizon#Hubble_horizon|"Hubble Horizon"}}, meaning they would no longer be observable. Matter itself could even cease to exist under some hypothetical scenarios, such as {{w|Proton_decay|proton decay}} or the {{w|Big_Rip|Big Rip}}. The joke of the comic here would be that all these scenarios are only possible in the unimaginably far future (exception: {{w|False_vacuum_decay|False Vacuum Decay}}) and do not need constant monitoring by astronomers.

==Transcript==
:[Ponytail is looking through a telescope, while Cueball is pressing buttons, which makes noises, on a remote control connected with a wire to a large board to their right. He controls the messages shown on this board.]
:Remote: Beep beep

:[The board has a black screen, with a label in a white section above the screen:]
:Astronomy Status Board:

:[The black screen has five rows with text in three columns. The first column is with white text. The second is in glowing green text and the last are in faded grey red text.]
Moon '''Still there''' Gone
Sun '''Still there''' Gone
Stars '''Still there''' Gone
Planets '''Still there''' Gone
Galaxies '''Still there''' Gone

==Conditions under which celestial objects might be considered "gone"==
Astronomers do regularly observe {{w|occultation}}s of stars by other celestial bodies, and sometimes also search through archived images for missed occultations. This can provide information on the size and orbit of an asteroid too small to observe directly, or other useful scientific knowledge, but occulted stars are not "gone", merely hidden. There are also a few astronomers who are searching image archives for [https://www.space.com/hunt-for-universe-missing-stars-space-mysteries stars that really have completely vanished without a trace] (or suddenly appeared), as this would be a sign of truly novel physics -- perhaps even a sign of extraterrestrial intelligence -- but no such vanishings have yet been identified. This comic appeared at the time the [https://vasconsite.wordpress.com/ VASCO project] is receiving media attention, claiming that [https://iopscience.iop.org/article/10.3847/1538-3881/ab570f 800 stars visible in 70 years old photos are not seen anymore].

Small stars which have exhausted their hydrogen fuel without building enough heat to fuse carbon or oxygen, are theorized to eventually collapse into faint "{{w|white dwarf}} stars" which are of such low luminosity that they are unlikely to remain visible to the naked eye from the Earth's surface except at very close proximities. The Earth's sun, Sol, is generally expected to follow this progression as a low-mass {{w|main sequence}} star, during the latter period of its {{w|stellar evolution}}. Although some stellar models predict that relatively rapid collapses are possible, the long time scale over which stellar evolutions are believed to occur decreases the odds of observing any one specific star both before and after this transition. In this comic, individual stars are not listed; therefore "gone" is unlikely to be useful for the stars, because a great number of stars would be "still there" until well after the expected collapse of our own sun.

Larger stars have enough mass and thus gravitational pressure to be able to react the waste products of previous stages, releasing more energy, until it starts fusing iron. Iron fusion actually absorbs energy which means the energy flow and the gravitational pressure are both going downward and in a few hours, the star with become a supernova, sending most of its mass away from the star with lots of even heavier elements included and crushing anything left in the middle down into degenerate neutron matter, forming a neutron star. Many neutron stars will continue to glow for millennia, but with no new reactions. Some neutron stars will have a "hot spot" which on the spinning surface of the neutron star forms a pulsar. If the original star was large enough, the neutron star will be so massive that it will curve space-time so much that it will become a black hole, which does not emit any light. In this way, some large stars will disappear, but the process of star formation to supernova to black hole still takes millions of years so is unlikely to be seen in a human lifetime. Many black holes will develop an accretion disc around them, made of in-falling matter, which will glow in visible to x-ray light; in this way a black hole can still be seen.

One of the proposed outcomes of the ultimate fate of the universe is the {{w|Big Rip}}. If it's correct, all the items on the status board will eventually move from Still There to Gone, beginning with the most distant galaxies and proceeding to the objects in our own solar system (although there will be hardly any time for the board to show Gone for the closest, especially the Moon). This scenario is dramatized in the short story "{{w|Last Contact}}" by Stephen Baxter.

Collisions between celestial bodies are commonly postulated as a fundamental part of the formation of {{w|planetary nebula}}. Since most mass in the known universe is observed to have a relatively low {{w|albedo}}, the presence of numerous unlit, massy bodies of planetary scale and smaller is strongly indicated. This is corroborated by measurements of orbital deflection detected in many visible stars, hinting at the possibility of large planets orbiting around them, unseen due to distance & low luminosity. The possibility of one or more local planets being "gone" could be attributed to unpredicted collision with another object of similar mass or equivalent velocity. Such a collision is one possible explanation for the sudden & catastrophic disintegration of Earth's moon, Luna, in the novel {{w|Seveneves}} by Neal Stephenson. This hypothetical event forms the premise of this book, during which Earth's whole sky becomes occluded by dust raised by millions of impacts across its surface & eventually by the constant incandescent descent of lunar debris itself. Again however, a single collision with any planet besides the Earth would not remove ''all'' the "Planets" from the Earth's visible night sky, so "gone" remains unlikely to be used for that category of celestial objects.

Occlusion of Earth's entire sky, due to airborne dust, volcanic ash, increased cloud cover, {{w|light pollution}}, or sufficiently dense layers of high-albedo material in orbit, may be the least unlikely potential reason for all of these celestial phenomena to be flagged as "gone". Notably, the phenomena in question would remain; only our view of them would be gone.

{{comic discussion}}

[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Cueball]]
[[Category:Astronomy]]
[[Category:Comics with color]]

Talk:343: 1337: Part 3

2024-04-26T12:06:11Z

172.70.163.48:

I can't narrow it down, but the "I think we should stab bad guys", coming from a possibly not psychologically 'normal' young girl, comes from ''something''. Firefly? Not sure, and I've not seen all of the Sarah Connor Chronicles yet, either, to my shame. Too early a comic to be Parker from Leverage (right attitude, though, c.f. when she got horribly cold-read by the fake psychic and got told what he'd done to her). But it's that sort of character. [[Special:Contributions/178.98.31.27|178.98.31.27]] 08:14, 19 June 2013 (UTC)

-Maybe the title text refers the Liar paradox, since under the paradox we can assume that all NSA people lie which would lead to the NSA man's saying no to lying = that he actually lied {{unsigned ip|108.162.223.47}}

I noticed Randall released this comic under a license for Wikipedia.
Where is it on Wikipedia?
[[User:Benjaminikuta|Benjaminikuta]] ([[User talk:Benjaminikuta|talk]]) 18:45, 22 October 2015 (UTC)

;Perching on the bedpost

This posture, and the whole composition of the scene, might refers to some classical representation of the devil inspiring the {{w|Devil's Trill}} to {{w|Giuseppe Tartini}}, a sonata considered as its masterpiece. [[Special:Contributions/162.158.91.160|162.158.91.160]] 09:18, 2 November 2015 (UTC)

How do we know Steve didn’t just have really long circular bars at the ends of his bed?

in panel 3 elaine perfectly described the ipod touch

At the top of the page, there is (at the time of writing) an add about "What If? 2" and when it comes out. this is always there... exept when viewing this comic, for some reason????? -QPc_G17

I don't think that using the rug to cross the barbed wire fence should be considered a specific reference, as this is a common method of circumventing it and was used in WWI and II. It would be like saying that using boltcutters to get through a chainlink fence is a reference to Monsters Inc., it could be, but there doesn't seem to be a lot of evidence for it. [[Special:Contributions/172.71.214.170|172.71.214.170]] 04:17, 16 October 2023 (UTC)

I'm not going to undo/redo [https://www.explainxkcd.com/wiki/index.php?title=343:_1337:_Part_3&curid=4076&diff=340658&oldid=326812 this edit], but it is untrue to say that you don't encrypt with a public key. You can (and often do, depending upon session type/requirements) as part of a handshaking method, using a public key that only the owner's private key can decrypt, so that only the intended recipient with their private-decrypting key can make use of what has been encrypted. (Typically double-encrypted, with the other layer being your private-encryption, for which only your publicly available decryption is valid, so that both parties now know that... as long as they trust the other's public keys for being genuine... in this particular session they can ''only'' be sharing information with the other party.) But this, and further additions of complication resulting from additionally trusted third-parties/etc, is perhaps too complicated to add up there. So just mentioning it here. [[Special:Contributions/172.70.163.48|172.70.163.48]] 12:06, 26 April 2024 (UTC)

Talk:2922: Pub Trivia

2024-04-24T08:54:42Z

172.70.163.48:

I expect that the BTS question is a reference to the traditional Korean system of counting a person's age in units of Sal which started at 1 and incremented on the first day of the year. Since this system was abandoned on official documents in 2023, but is still in use in some contexts, the question of whether every member of BTS had a "birthday" on the first day of the year is ambiguous. [[User:Philhower|Philhower]] ([[User talk:Philhower|talk]]) 14:13, 19 April 2024 (UTC)
:This is marked as fiction https://www.youtube.com/watch?v=csSYfPaBaS4, but was it?

question 5, planets exist outside the solar system, adding to the ambiguity. [[User:Philhower|Philhower]] ([[User talk:Philhower|talk]]) 14:15, 19 April 2024 (UTC)
:One of the requirements in the definition of a planet is that it orbits the Sun, so no there are no planets outside the Solar system. [[User:Tharkon|Tharkon]] ([[User talk:Tharkon|talk]]) 17:50, 19 April 2024 (UTC)

::{{w|NASA}} disagrees. [https://exoplanetarchive.ipac.caltech.edu/ Exoplanet Archive] shows 5612 confirmed planets. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 20:55, 19 April 2024 (UTC)
::: The IAU is the body that defines such things - and they do say that planets have to orbit the Sun...things that orbit other stars are properly called "exo-planets". But still - do we include dwarf planets? Rogue planets? It's definitely a crazy-vague question. [[Special:Contributions/172.70.211.219|172.70.211.219]] 21:05, 19 April 2024 (UTC)
:::: the IAU is one body that claims the authority to define such things, but their authority is not recognized by any of the things they are claiming the right to name. (Except for a very small part of earth, mostly made of humans) [[Special:Contributions/172.69.58.203|172.69.58.203]] 00:10, 20 April 2024 (UTC)
::::That seems ridiculous, "If it isn't one of ours it don't count"? That'd be like saying "They're only 'cars' if they use North American roads, in other countries using THEIR roads you have to call them exo-cars!". LOL! And every future/space-based fiction calls them planets, just makes more sense not to be so arbitrarily exclusionary. Ours isn't the only sun, we shouldn't pretend it has some aspect that makes it count more than others - outside of that it's the one with us. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 06:09, 20 April 2024 (UTC)
::::: Correction, the IAU definition explicitly states that it is only about planets within the solar system and has no comment about exoplanets one way or the other. Presumably, to leave some flexibility on all the weird edge cases that are bound to come up with exoplanets. https://www.iau.org/static/resolutions/Resolution_GA26-5-6.pdf [[Special:Contributions/172.68.195.213|172.68.195.213]] 07:55, 21 April 2024 (UTC)
::::Gas giants should be excluded too - they're not planets - just wannabe stars.[[Special:Contributions/172.70.163.31|172.70.163.31]] 08:34, 22 April 2024 (UTC)

: I think the correct answer is 0: before the solar system formed there were no planets. So, originally, there would have been none. If exo-planets count, going back to the beginning of time gives the same answer: when the universe came into existence during the big bang there were no stars, let alone planets orbiting them. Even religion agrees: in the beginning God created the earth and the heavens, but the sun came later, so technically earth was not a planet since it didn't orbit anything.--[[Special:Contributions/162.158.62.49|162.158.62.49]] 22:23, 19 April 2024 (UTC)

As for question 9, please see the note about the history of Austrailia's capitals at: [[https://en.wikipedia.org/wiki/List_of_former_national_capitals#Oceania]]. and the page regarding countries with multiple capitals [[https://en.wikipedia.org/wiki/List_of_countries_with_multiple_capitals]] [[User:Philhower|Philhower]] ([[User talk:Philhower|talk]]) 14:24, 19 April 2024 (UTC)
: See Also [https://en.wikipedia.org/wiki/List_of_Australian_capital_cities List of Australian capital cities] - As an Australian, I believe many would also consider the major city in their state/territory to be a capital city, although not the capital of Australia.

: The explanation misses the possibility that this is a Dad joke: where the capital city of Australia is 'Canberra,' as long as the respondent doesn't actually count either the letters in Canberra (1,2,3,4,5,6,7,8) or the population of Canberra (unknowable/ambiguous). [[User:Bilkie|Bilkie]] ([[User talk:Bilkie|talk]]) 14:12, 22 April 2024 (UTC)

About the alt text, London is certainly in Europe. The question itself is malformed because "Europe (or 'the EU')" is not self-consistent: there is a lot of European countries that are not part of the EU. [[User:RedGolpe|RedGolpe]] ([[User talk:RedGolpe|talk]]) 14:32, 19 April 2024 (UTC)
:The "Greater London" answer is also tricksy, as the "ceremonial county" of GL {{w|London boroughs|may not include}} the additional area of the City Of London (though it does include the City Of Westminster, which is sometimes the trick answer to certain trick questions that a quizmaster might attempt to pull). The ''administrative'' Greater London is the ceremonial one ''plus'' CoL, however... [[Special:Contributions/172.70.162.19|172.70.162.19]] 15:04, 19 April 2024 (UTC)
::I would argue London is not in Europe because there is no clear definition for Europe as a geographic area, it really doesn't have an eastern border that is not arbitrary, so the only clearly defined thing Europe can refer to is the EU. [[User:Tharkon|Tharkon]] ([[User talk:Tharkon|talk]]) 17:50, 19 April 2024 (UTC)
:::London, France is both in Europe and the EU https://en.wikipedia.org/wiki/London,_France [[Special:Contributions/172.70.163.49|172.70.163.49]] 18:00, 19 April 2024 (UTC)
:::While the eastern border of Europe is not clearly defined I am not aware that there is any definition of (geographic) Europe that excludes the islands (and subsequently London) --[[Special:Contributions/162.158.202.135|162.158.202.135]] 21:24, 19 April 2024 (UTC)
::::There's "mainland Europe", excluding islands. Or at least any of several possibly island archipeligos and/or island nationstates. e.g. Mont-Saint-Michel might not be (exluded, that is, due to being French and having a (tide-dependant) ground access), Jersey would be (British Crown Territory island), Malta probably (island state), Sicily would depend on your thinking (it being Italian, and much larger than the strait that makes it an island offshoot). Most of Scandinavia might be interestingly included (with Denmark) or excluded (with Iceland), according to context. Even Gibraltar might or might not be, depending upon upon the thinking (or lack of it) behind the use of the term. (But, fiddling around the edges aside, (the English) London is not in "mainland Europe" and hasn't been for maybe a full 10kY before it became "London" in any useful sense.) [[Special:Contributions/172.70.163.49|172.70.163.49]] 23:44, 19 April 2024 (UTC)
::::: The phrase "continental Europe" is also used, and might be implied by a British person saying "I travelled around Europe last year". [[Special:Contributions/172.69.195.54|172.69.195.54]] 15:01, 21 April 2024 (UTC)
::::: The (semi-)apocryphal headline "Fog In Channel, Continent Cut Off" is perhaps indicative of the {{w|Continental Europe#Great Britain and Ireland}} British collective mindset (of which I must therefore be a component, albeit not at that end of the spectrum). [[Special:Contributions/172.71.242.71|172.71.242.71]] 15:39, 21 April 2024 (UTC)
:::I'd say The European Council has at least as good (or bad, depending which way you look at it) a claim to be 'Europe' as the EU does, and London (through the UK) is in that (for now, anyway).[[Special:Contributions/172.71.242.55|172.71.242.55]] 09:07, 22 April 2024 (UTC)

The [https://en.wikipedia.org/wiki/Benxi Benxi Lake] is actually considered to be the smallest lake in the world. [[Special:Contributions/172.70.135.205|172.70.135.205]]
:{{cn}}[[Special:Contributions/172.70.86.176|172.70.86.176]] 14:40, 19 April 2024 (UTC)
:Many websites says Benxi lake is recognized by Guinness records, but guinnessworldrecords.com does not have such a record. Either they recognized smallest lakes previously but not anymore, or they never had such a record and we are witnessing citogenesis ([https://xkcd.com/978/]) [[Special:Contributions/172.71.154.210|172.71.154.210]] 17:33, 22 April 2024 (UTC)

I never realized how challenging it is to edit pages when they've just been posted. Makes me long for something like Google docs.[[Special:Contributions/172.68.3.43|172.68.3.43]] 14:39, 19 April 2024 (UTC)

People, who are born on 29th February don't have a birthday in years which are not leap years. However, 2024, when this comic was published is a leap year. --[[Special:Contributions/162.158.95.9|162.158.95.9]] 14:40, 19 April 2024 (UTC)

"5. How many planets were there originally?" This could also refer even back to the start of the universe, when there were (likely) just 0 planets. --[[Special:Contributions/162.158.86.101|162.158.86.101]] 14:43, 19 April 2024 (UTC)

I anticiated a lot of Edit Conflicts, but not actually quite so many as to not to be able to resolve my edits with everyone else's. This is the bare-bones that I was putting in (until finding multiple attempts tried to be added consecutively...
{{cot}}
{| class="wikitable"
|-
! Question !! Problem !! Possible answer(s)
|-
| Which member of BTS has a birthday this year?
| Every living person has a birthday this year (being a leap-year, this includes those born on 29/Feb).
|
|-
| How many sides does a platonic solid have?
| There are five (or [[2781: The Six Platonic Solids|six]]) platonic solids, each with a different number of sides.
| 4, 6, 8, 12 or 20
|-
| What is the smallest lake in the world?
| The distinction between a small lake and a pond, pool or puddle (for example) is difficult to define.
|
|-
| Which Steven Spielberg movie features more shark attacks? Jaws (1875) or Lincoln (2012)
| Not a problem, as Lincoln has very few shark attacks.{{Citation needed}} The problem is that barely anyone will ''not'' be able to correctly answer this.
|
|-
| How many planets were there originally?
| Contextually vague. At what time and within what volume of space, and what is the scope of 'planet' defined here?
|
|-
| What NFL player has scored the most points outside of a game?
| Outside of (NFL) games, individuals may accumulate points in any number of ways (e.g. Scrabble)
|
|-
| The Wright brothers built the first airplane. Who built the last one?
| Until no further planes are built, individuals/teams/companies continue to build (to completion) ever more examples, changing the answer possibly moment to moment.
|
|-
| Is every even number greater than 2 the sum of two primes?
| This is a {{w|Goldbach's conjecture|currently unanswered question}}.
|
|-
| Not counting Canberra, what city is the capital of Australia?
| Canberra is ''the'' capital of Australia, a fairly well known 'obscure' fact. Each Australian territory also has their own state capital, so there is not one other ''single'' example.
|
|-
| Who played the drums?
| Lack of context. With which group? For which song? For which (re-)recording? At which event?
|
|-
| Where is London located? (a) The British Isles (b) Great Britain and Northern Ireland (c) The UK (d) Europe (or 'the EU') (e) Greater London
| Almost all of these are correct (though London is geographically in Europe but no longer in the EU).
|}

This is apparently deliberate (at least on behalf of the organisers), perhaps to upset or otherwise impede groups of overconfident quizzers who would otherwise dominate any genuinely good quiz.
{{cob}}
...make use of it however you wish, anybody who has the time not to keep chasing all the simultaneous edits. (The above is a bit behind 'perfection', and lacks many of the integrations, wikilinks and adjustments I had made. I backspaced out of the edit I had finally reached, before remembering to take a full copy into my paste-buffer!) [[Special:Contributions/172.70.90.115|172.70.90.115]] 14:53, 19 April 2024 (UTC)

I thought the answer to #2 could be 1, because as 3D solids they only have one surface. I would guess the player with the most points outside of a game is the one who's played idlers (like Cookie Clicker) the longest — though I suppose those could be considered "inside of a game" as well. Also, I played the drums. [[Special:Contributions/172.70.254.143|172.70.254.143]] 15:33, 19 April 2024 (UTC)
:The answer to #2 is '2 - the in-side and the out-side'.[[Special:Contributions/172.69.43.242|172.69.43.242]] 15:46, 19 April 2024 (UTC)

Considering the platonic solids explanation lists all the correct answers, could someone include a list of all the members of BTS and their respective birthdays? Bing copilot suggests the following:

1. **Jin (Kim Seok-jin)**:
: - Birthday: **December 4, 1992**

2. **Suga (Min Yoon-gi)**:
: - Birthday: **March 9, 1993**

3. **J-Hope (Jung Hoseok)**:
: - Birthday: **February 18, 1994**

4. **RM (Kim Nam-joon)**:
: - Birthday: **September 12, 1994**

5. **Jimin (Park Ji-min)**:
: - Birthday: **October 13, 1995**

6. **V (Kim Tae-Hyung)**:
: - V's birthday is **December 30**, but the year is not mentioned in the provided information.

7. **Jungkook (Jeon Jungkook)**:
: - Jungkook's birthday is **September 1**, but the year is not mentioned in the provided information.
[[Special:Contributions/172.70.162.19|172.70.162.19]] 15:48, 19 April 2024 (UTC)

: I'm not opposed to adding BTS birthdays, but I think it should be done by someone more knowledgeable about the band than me. Birthdays can be a surprisingly nuanced subject.[[User:Comatoran|Comatoran]] ([[User talk:Comatoran|talk]]) 15:59, 19 April 2024 (UTC)
:Wikipedia says {{w|V_(singer)|'95}} and {{w|Jungkook|'97}} respectively[[Special:Contributions/172.70.162.37|172.70.162.37]] 16:04, 19 April 2024 (UTC)

London is both a City (London) and a City within a City (The City of London) and an Area (Greater London)
There are also many more places named London than the one that is the Capital of the UK .. Serbia, France, Canada (Which is larger and the one in the UK), 10 in the USA, and one on Kiribati 17:56, 19 April 2024 (UTC)
:Are you saying London, Ontario, Canada is BIGGER than the more famous London, England??? That's a country capital! Is that seriously true? I'm Canadian, I don't know London, ON as being THAT big... [[User:NiceGuy1|NiceGuy1]] ([[7User talk:NiceGuy1|talk]]) 05:52, 20 April 2024 (UTC)
::It's very unlikely to be larger in population terms than the (common!) wider definition of the main UK London, as that would make it larger than any other city in Canada by a large margin. In terms of area, London ON is very likely to be larger than the City of London (which is surprisingly small). More widely, the definition of what actually is a "city" is more complex than it appears to be at first glance; administrative areas (what official statistics are collected for) are often quite different from where the bulk of people are. --[[Special:Contributions/162.158.74.25|162.158.74.25]] 07:20, 20 April 2024 (UTC)
:::Some wikipedia figures, for reference:
:::*{{w|London, Ontario}} = 168.76 sq mi, Population 422,324
:::*{{w|City of London}}, subset of Capital of UK = 1.12 sq mi, Population 8,618
:::*{{w|London}}, administrative/etc capital of UK = 606.96 sq mi, Population 8,799,800
:::*{{w|London, Belgrade}} = a 'neighbourhood' (<1 sq mi?), Population unknown
:::*{{w|London, France}} = 'a small agricultural village'
:::*...
:::*{{w|List of minor planets: 8001–9000#837|8837 London}} = 1.5 mi diameter (~28s q mi, ~14 cu mi?), Population... some of the {{w|Clangers}}?
:::I skipped a few of the others (e.g. the various US ones: cities, townships, communities)... [[Special:Contributions/162.158.230.46|162.158.230.46]] 18:10, 20 April 2024 (UTC)

I'm surprised there were no phishing-type questions (i.e. "what are the last four digits of your social security number", "what are the three numbers on the back of your debit card", etc).22:33, 19 April 2024 (UTC)

The only correct answer(s) to "who played the drums" would be "the drummer", or "twelve drummers", but I would accept Phil Collins, Alex Van Halen, or Ringo Starr for half a point each [[Special:Contributions/108.162.241.100|108.162.241.100]] 02:40, 20 April 2024 (UTC)
: "Who played the drums" is Keith Moon; in this cryptic clue, "Who" is the name of the band, and "played the drums" indicates the drummer; hence the answer is Keith Moon, the drummer of The Who. [[User:Sabik|Sabik]] ([[User talk:Sabik|talk]]) 04:29, 22 April 2024 (UTC)
:Clearly the correct answer is 'Animal'.[[Special:Contributions/172.71.178.176|172.71.178.176]] 08:45, 22 April 2024 (UTC)

I asked my Mom these questions & she said the answer to #7 so flatly: ''Boeing ''
[[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 02:44, 20 April 2024 (UTC)

On the Capital of Australia: Melbourne hosted parliament before Canberra was built, and Jervis Bay was part of the ACT: https://en.wikipedia.org/wiki/Jervis_Bay_Territory

Are there people outside of the USA that are surprised to learn that Washington D.C. is the capital of the USA, rather than New York, Los Angeles, Chicago etc. due to its relatively small population? ("only" ~670000 in 2024) [[User:These Are Not The Comments You Are Looking For|These Are Not The Comments You Are Looking For]] ([[User talk:These Are Not The Comments You Are Looking For|talk]]) 06:50, 21 April 2024 (UTC)

I came here all prepared to say that the Title Text should have Ontario, Canada as a (likewise correct) answer, but I see somebody already put that into the table, LOL! I feel like the "More Reasonable" version of the planet question should NOT mention Pluto, it should be the question IMPLIED in the comic whose answer is 9 (such as "How many planets were originally in our Solar System", but without the ambiguity of "originally". Basically a question whose answer is 9, pushing people to include Pluto, while allowing people the mistake of saying the current answer of 8, but mentioning Pluto would ruin that/the question). [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 05:52, 20 April 2024 (UTC)

There could also be a person Named "London" who is located somewhere, perhaps in the same bar (or not) -- [[Special:Contributions/172.70.46.71|172.70.46.71]] 12:13, 20 April 2024 (UTC)
:https://en.wikipedia.org/wiki/London_%28name%29 [[Special:Contributions/172.70.42.31|172.70.42.31]] 16:27, 20 April 2024 (UTC)

I thought I knew the minimum size of a lake by definition, at least in the US, but I just found different authorities asserting 1, 10, and 20 acres as the distinction between a lake and a pond. Two non-metric distinctions are that a lake has an aphotic (dark) zone, or a lake is fed and drained by a river, but they don't help here. [[Special:Contributions/172.70.43.53|172.70.43.53]] 16:22, 20 April 2024 (UTC)

For the love of god can we stop saying that Pluto was "demoted" to a dwarf planet? It didn't have its category changed, it had its category defined (for the first time!). It was a founding member of a newly named category. And it's not like planets are better than dwarf planets, they're just different. (I'm going to die on this hill, ain't I?)
[[Special:Contributions/172.68.34.16|172.68.34.16]] 01:35, 21 April 2024 (UTC)
:Yes, you probably are. When it happened, many people, including astronomers, considered it a downgrade. There's some prestige in being a planet -- the Sun and the planets are considered the most significant objects in the Solar System. The qualifier suggests that it's less important than the "real" planets, and was kicked out of the planet club for being deficient in some way. Maybe we need a campaign from dwarf humans to remind everyone that they're just smaller, but they have no less dignity. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 23:41, 21 April 2024 (UTC)
:I'll cheerfully die there with you. But I'll also point out while I'm doing so that if it's a 'dwarf ''planet''', then clearly it is still a planet. I mean, people would look at you funny if you tried to claim that a dwarf elephant wasn't an elephant. And perhaps more pertinently, a dwarf star is still a star. So the answer to 'how many planets are in our solar system?' is 'at least 16 that we know of - depends how far down you count. Unless you discount the gas giants, in which case you need to subtract four. Or maybe two. Wait - how many are we on now again?'[[Special:Contributions/172.71.178.157|172.71.178.157]] 11:14, 22 April 2024 (UTC)

For the planet question there's also Theia, which is theorized to have been a planet prior to smashing into proto Earth and forming the moon and modern larger Earth. So there used to be at least nine planets by the current definition in our solar system.
[[Special:Contributions/162.158.155.20|162.158.155.20]] 03:50, 21 April 2024 (UTC)

For question #8, it's not that mathematicians were idling around. A lot of partial results were made, see Wiki. [[Special:Contributions/172.71.160.33|172.71.160.33]] 08:22, 21 April 2024 (UTC)

I was confused by this question at first. The answer is "no." It is disproved by example. 21+3=24 21 is not a prime. 24 is even. {{unsigned ip|162.158.154.65|19:38, 21 April 2024}}
:24 is the sum of many pairs of numbers. Amongst those pairs (as with any even number >2) may be one ore more pairs of primes (even 2, if you count 1 as a prime - though generally one doesn't). 24 is (just looking at the odd numbers >1) 21+3, 19+5 (both primes!), 17+7 (both primes), 15+9 (no), 13+11 (both primes) and then of course the reverses of these (if you count those). So 24 is the sum of two primes (three, or six, times). 4 is just the sum of 2+2, 6 is only 3+3, 8 is only 5+3... And every even number checked from there on up ''can'' be expressed as the sum of two primes (at least once). But is there ever a point at which there is an even number that is not?
:With 3, 5 and 7 being primes, then you can definitely say that if N is an even number that has (or even relies upon) a solution with 3, then N+2 and N+4 are, which would be answerable by the same sum but with 5 or 7 instead. Plus N+8 (3->11), N+10 (3>13). And maybe you can fill in the N+6 and N+8 by the ''other'' prime used being also a suitable twin prime that you can swap out for the P±2 partner. But only if it's the right prime of any given pair, and not all primes are twins, so there's a lot more to consider about whether any given advancement up the even-numnber ladder can be answered by a suitable pair of primes.
: e.g. 15440=7717+7723 (one possible solution). 15442 therefore needs +2 to that. But 7717 and 7723 ar adjacent primes that areen't two apart (so you can't just add two to 7717 and have 7723 + 7723) and the next adjacent primes are 7703 and 7727 (not two apart, and not obviously useful to go 7717->7703, either). So there must be another solution (theoretically, but also proven by having been checked). By doing ''quite a bit'' of to-and-fro (if that's how we're doing it), we can finally announce that 15442=7649+7793 (but I also found 7523+7919, 7541+7901, 7559+7883 and 7589+7853, before I stopped the search). So It works up to 15442.
:15444? Well, neither 7649 or 7793 have a +2 prime-partner. But 7589 is followed by 7591 (as a new partner to 7853). And 7559 is followed by 7561, so 7561+7883 would also be an answer. There will (probably) be many others.
:But will there ''always'' be many others? Or even just the one? I'm sure someone has been counting how many unique (bidirectional) solutions each number has, and probably there are some that ''only just'' get the requisite single pair of primes that sum to it. Could it ever not even manage that? Those actually familiar with the efforts to prove the conjecture would know, rather than a fool like me coming fresh to the problem. (Relatively, that is... I already knew about it, but I've never tried to wade into the actual theory until right now, and this random example I set up to 'explain' this, just now.) [[Special:Contributions/172.71.242.175|172.71.242.175]] 21:01, 21 April 2024 (UTC)
:: It looks like it was a mistake on my part to infer that the question meant "exclusively the sum of two primes." Allen [[Special:Contributions/162.158.62.237|162.158.62.237]] 15:12, 22 April 2024 (UTC)
::: Ah, I see. Well, ''no'' number is "''just'' the sum of two primes" (4=3+1, and 1 isn't prime; or 4+0, and neither of those are; all before considering negative, fractional or even complex/quaternian 'summations' (e.g. (2+3i)+(2-3i)=4), which primes definitely are not part of, regardless of how they together become '4'...), so "Is every even number greater than 2 the sum of two primes?" sort of has to imply only that there "are two primes which sum", rather than ever "the only numbers which sum will all be primes". Hyper-pedanticity (or deliberate linguistic trickery) aside, that's really not in question.
::: But nice to understand where you were coming from, at least. [[Special:Contributions/172.70.163.49|172.70.163.49]] 20:15, 22 April 2024 (UTC)
*About Q2: the "number of sides" may be "the average number of sides" of a Platonic solid, which is 10, despite having no Platonic decahedron
*About Q10: with a correct list of answers, it ''may'' be kept as-is with having to select the drummer(s).
[[Special:Contributions/162.158.78.38|162.158.78.38]] 10:47, 22 April 2024 (UTC)
:That assumes that the Platonic solids occur in equal numbers in the universe. In actuality, there are probably more of some than others, which would throw your average off. Alternatively, you could argue that none of any of them actually exist (by virtue of them being Platonic, and any example being an imperfect approximation), in which case the answer is either 'none' or 'unanswerable', since you can't average nothing.[[Special:Contributions/172.70.85.156|172.70.85.156]] 12:39, 22 April 2024 (UTC)

The smallest lake in the world is Snowf Lake. {{unsigned ip|172.70.34.58|02:22, 23 April 2024}}

The title text reminds me of some old viral social media post where an alleged smart-a** teacher made a test question that was like "What is the opposite of 'old'? (a) new (b) young". (I don't remember if it was specifically mentioned, but the implication was that the question would then be graded completely arbitrarily.) [[User:Zowayix|Zowayix]] ([[User talk:Zowayix|talk]]) 21:01, 23 April 2024 (UTC)

== Smallest lake ==

IMHO there is a reasonable interpretation of the smallest lake question: what is the smallest officially named naturally occurring body of freshwater. [[User:Stevage|Stevage]] ([[User talk:Stevage|talk]]) 06:31, 24 April 2024 (UTC)
: Does this go so far as to include "...that has the word 'lake' in it"? (Or ’lac’, or other acceptably ''exact'' linguistic equivalent, perhaps?)
: There is the "How many lakes are there in the {{w|Lake District}}?" classic British quiz question. Possible answer: there are perhaps 21(ish) 'lake-like' water bodies, but only Bassenthwaite Lake is ''called'' a lake, the rest are 'water's, 'mere's, 'tarn's (maybe then "not-a-lake", like "lochens are not lochs") and a handful of reservoirs (maybe not a lake, for being not natural?). Thus to avoid trouble, and especially how far to go to down the "pond, pool and puddle" route, the only truly unambiguous answer, once you know the 'trick', is "one". (Noting that "Lake Windermere" is a common misnomer for the body of water that is really just "Windermere", the actual largest "English lake". It having perhaps been tautologically enhanced to distinguish from "Windermere, the town", the main settlement in the area that was actually called Birthwaite prior to the arrival of the railway station that took the 'lake' name and then just rolled with it for the benefit of the unwashed/washed visiting masses.)
: ...this being sort of summarised in the Explanation at one point, actually, but got considered surplus. But a "smallest lake in the Lake District" question of this kind now explicitly excludes all the arguments about whether that means Easedale Tarn (by most linear dimensions) or Hayeswater (volumetric), whether or not you subscribe to other physical classification exclusions or the "Lake Windermere" name. [[Special:Contributions/172.70.163.48|172.70.163.48]] 08:54, 24 April 2024 (UTC)

2503: Memo Spike Connector

2024-04-23T13:50:07Z

172.70.163.48: Undo revision 340406 by 162.158.19.158 (talk) No thanks. Giving you zero stars on Trip Adviser...

{{comic
| number = 2503
| date = August 16, 2021
| title = Memo Spike Connector
| image = memo spike connector.png
| titletext = Backward-compatible with many existing cables, and can connect directly to phones or tablets if you press them down hard enough.
}}

==Explanation==
This is the third installment in the series of [[:Category:Cursed Connectors|Cursed Connectors]] and presents Cursed Connectors #102: The Memo Spike. It follows [[2495: Universal Seat Belt]] (#65) and was followed 9 days later by [[2507: USV-C]] (#280).

The comic depicts a large metal spike with a wire coming from the base. The spike stabs through two other wires, thus creating an electrical connection between the three. As the name suggests, the spike resembles a {{w|Spindle_(stationery)|stationery spindle}}, colloquially known as a spike, called a Memo Spike here by [[Randall]]. However, unlike normal spindles, this one has a cable of some kind coming out of it, suggesting this is a hub of some sort.

Spindles are used to temporarily hold paper by "spindling" or impaling the paper onto the spike (as depicted in the comic). They're most known for their use in restaurants as a way to hold bills that have been paid, or traditionally in offices that work with many bits of paper, e.g. with invoices in a finance department or hardcopy in newspaper editing, to prevent accidental disturbance/shuffling, at the expense of a small puncture mark in each sheet so impaled. (This could cause errors in papers with punch-holes that are meant to be read by machines, hence the admonition against "{{w|Punched_card#Do_Not_Fold,_Spindle_or_Mutilate|folding, spindling, and mutilating}}".) In the latter context, the editor might put all the rejected stories onto a spike (rather than into a wastebasket) to prevent them going astray, and this might be the source of the term '{{w|Spike (journalism)|spiked}}'.

The joke of the comic is while any number of non-destructive connection standards exist, a large spike can provide much of the same results: a conductive object that retains a connection of multiple wires in a way that allows electricity to pass through. Indeed, in the early days of Ethernet, {{w|Vampire tap|vampire taps}} were used, essentially spikes that bit into a cable to establish a new branch in the network. Another type of connection which involves piercing the wire is a {{w|Punch-down block|punch-down block}}, a type of {{w|Insulation-displacement_connector|insulation-displacement connector}}, where one or more wires are pushed into a cutting channel instead of onto a spike.

Depending on the type of cable it is also likely to create a short circuit, e.g. by connecting both strands of a twisted pair of strands in a typical Ethernet cable, or the central wire and the sheath of a coaxial cable. In an enterprise environment, this could even happen on a {{w|Power_over_Ethernet|PoE-Connection}}, which actually carry more noticeable amounts of power (up to 25.5W). Even if this is avoided, the single spike may be large enough to mechanically sever a random subset of the finer strands that exist within a multicore cable such as is commonly in use today.

The title text takes this a bit further. It says that it is backwards compatible with many existing cables. This means any cable large enough to be impaled by the spike could be used. Needless to say it will likely not work anyway. It also continues by saying that phones and tablets can also be connected using this method if you press them down hard enough over the spike. Thus if you actually manage to make the spike penetrate the device's coverings to reach the electrical parts, then there is a connection. The implication is that any device or cable can be connected to any other device or cable as a form of universal adapter/splitter/combiner across arbitrary hardware and communications/power standards. In reality, this could be even more dangerous and will surely destroy the phone/tablet either directly or by overloading their cable connection.{{citation needed}} Also be careful not to impale your hand while trying to push the spike through your tablet's screen.

==Transcript==
:[A memo spike is shown (a device also called a Spindle). It is a long spike standing up from a round base plate. A wire is coming in from the left and appears to be hardwired into the spike's base element. Two other wires comes in from the right. Both are firmly impaled down upon the spike, penetrated completely through shortly before their apparently unterminated ends. The end of the impaled wire closest to the base faces out and the details appear to show it to be of some variety of multicore (rather than co-axial) manufacture. The other cable's end is a bit higher and points into the image. Above is a title and below is a label.]
:Cursed Connectors #102
:The Memo Spike

{{comic discussion}}


[[Category:Cursed Connectors]]

Talk:2922: Pub Trivia

2024-04-19T23:49:25Z

172.70.163.48:

2921: Eclipse Path Maps

2024-04-19T13:22:09Z

172.70.163.48: /* Explanation */ darnit, typos/editos.

{{comic
| number = 2921
| date = April 18, 2024
| title = Eclipse Path Maps
| image = eclipse_path_maps_2x.png
| imagesize = 562x674px
| noexpand = true
| titletext = Okay, this eclipse will only be visible from the Arctic in February 2063, when the sun is below the horizon, BUT if we get lucky and a gigantic chasm opens in the Earth in just the right spot...
}}

==Explanation==
{{incomplete|Created by a TORNADO WORLD CHAMPIONSHIP WINNER - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
A total {{w|solar eclipse}} occurred {{w|Solar eclipse of April 8, 2024|on April 8, 2024}} in North America, ten days before this comic. This comic comments on the fact that most solar eclipses happen on territories not easily reachable by humans, places with weather conditions that make viewing the eclipse less appealing, like cloudy skies (mentioned previously in [[2915: Eclipse Clouds]] and [[2917: Types of Eclipse Photo]]), fog, or tornadoes (also a [[:Category:Tornadoes|recurring subject]] on xkcd), or areas that experience only a short period of totality.

{| class="wikitable"
|-
! Zone label !! Geography !! Suitability for observation
|-
| Zone where totality lasts 1-2 seconds || Land || No stated issues for visiting, but rendered all too brief an experience for astronomical reasons.
|-
| Bay of shifting ice || Water (part frozen) || Open water might make this location accessible by boated observers. Solid ice ''might'' grant observers ready access by skidoo, ski and/or skid-plane. Shifting ice causes problems for all these modes of access.
|-
| Shipwreck cove || Water/Coast || The name describes the likely impediment to any boat access.
|-
| Desert so harsh they train Mars astronauts there || Land (peninsula) || Implied inhospitable, and probably a lack of any normal transport/accommodation infrastructure.
|-
| Sea of rocky crags and maelstroms || Water (straits) || Yet more risk of nautical hazards, including {{w|Whirlpool|strong rotating currents}}. Possibly a nod to Scylla and Charybdis from The Odyssey.
|-
| [State department travel advisory] || Island || Unknown risk, but probably involves some form of political instability, war, or major health hazard that makes unnecessary visits highly inadvisable. May also be a result of adverse weather effects. Or perhaps all of these at the same time.
|-
| Isle of perpetual fog || Island (inc. littoral zones?) || Meteorologically unfortunate (ground visibility; ''may'' not fully obscure the skyward view).
|-
| Nice, scenic, accessible area (6 square miles, 40,000,000 visitors expected) || Land || Apparently ideal in all respects. Except for the crowds. For scale, forty million visitors is slightly more than the total population of California (alternately, somewhere between those of Canada and Poland). Six square miles is about one ''tenth'' the area of Washington DC (similarly around one tenth of Liechtenstein or, if you prefer, less than eight times Monaco). This would mean up to three people for every square metre, even before accounting for existing population and obstructions, as well as a high probability of {{what if|8|travel congestion}}.
|-
| Tornado capital of the world || Land || Meteorologically unfortunate (frequent disruptive wind vortices, and cloud cover likely).
|-
| Area where the eclipse will be low in the sky, behind the tornadoes || Land || Astronomically disadvantageous, with added complications from the neighbouring weather system.
|}

The title text mentions the {{w|Solar eclipse of February 28, 2063|solar eclipse of February 2063}}, and claims it will only be visible from the Arctic, though in fact this annular eclipse will traverse through the Indian Ocean. The eclipse in the comic would supposedly happen when the {{w|Sun}} would be below the horizon, which is a contradiction in terms, since an eclipse is only an eclipse from the standpoint of the viewer — it is equivalent to saying that the eclipse is not visible from that location, but is visible from a location over the horizon, at a point that is at the other end of a direct straight line {{w|Chord (geometry)|through the Earth}} that is directed 'down' towards the unrisen Sun and Moon. It then jokingly suggests that a giant chasm could open up between the location being considered and the location from where it would be visible, allowing people to view it. If this did happen, the chasm itself would likely eclipse the eclipse as a spectacle. In most cases, it would also likely cause severely detrimental effects (for example, magma eruptions, tsunamis, etc.), and would therefore not be considered 'lucky' by most people, despite the small and short-term benefit of being able to view an eclipse from a previously unsuitable location.

'''Note'''

The {{w|Novaya Zemlya effect}} can make it possible to observe a solar eclipse when the Sun is below the horizon at the poles during certain weather conditions. Also called a "polar mirage", the effect is when an atmospheric inversion ducts sunlight along the surface of the Earth for distances up to 250 miles (400 km), which would make the Sun appear 5° higher in the sky than it actually is. This appears to be the rare situation where [[Randall]] was unaware of an obscure scientific phenomenon that would contribute to a joke.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:'''Every eclipse path map'''
:[A grey band representing the totality path of an eclipse travels along the map across several labels. Labels along the path from top to bottom:]
:[On land] Zone where totality lasts 1-2 seconds
:[On water] Bay of shifting ice
:[On water] Shipwreck cove
:[On land] Desert so harsh they train Mars astronauts there
:[On water] Sea of rocky crags and maelstorms
:[On a big island; label in square brackets] State department travel advisory
:[On a small island] Isle of perpetual fog
:[On small part of a peninsula] Nice, scenic, accessible area (6 square miles, 40,000,000 visitors expected)
:[On land] Tornado capital of the world
:[On land] Area where the eclipse will be low in the sky, behind the tornadoes

{{comic discussion}}

[[Category:Solar eclipses]]
[[Category:Maps]]
[[Category:Tornadoes]]
[[Category:Weather]]

Talk:83: Katamari

2024-04-18T21:30:13Z

172.70.163.48: Undo revision 339992 by Z1mp0st0rz (talk) ...are you not signing, or even making sense?

I do not know if Randall was the first to come up with this idea, and King of Cosmos' comment in the Alt-Text, but it is one of my favorite remarks about Katamari. [[User:Tryc|Tryc]] ([[User talk:Tryc|talk]]) 14:55, 13 June 2013 (UTC)

My take: Girl asks boy to pause game so he can help her. Boy doesn't want to, because he is closed to completing a level. However, saying something like "wait until I complete the level," will never fly with girl and boy would lose 'relationship points.' His solution: stall girl by giving a super-romantic speech while continuing to play. The girl obviously fell for it, and boy reached his next gaming level while girl is googly-eyed. [[User:Danshoham|Mountain Hikes]] ([[User talk:Danshoham|talk]]) 04:09, 31 August 2015 (UTC)

You know, this kind of reminds me of a song by a band called Devo. The song is called Snowball, and it uses a sort of similar metaphor. But then people thought it was secretly about cocaine. To be fair, the band was pretty much high on cocaine for the better part of their heyday from 78-83. Look them up. [[User:RedHatGuy68|RedHatGuy68]] ([[User talk:RedHatGuy68|talk]]) 06:02, 2 February 2016 (UTC)

WTF is a katamari ball? This explanation fails to explain. --[[User:Calion|Calion]] ([[User talk:Calion|talk]]) 12:01, 28 February 2023 (UTC)
:The link to the game explains it as meaning "clump" (hence a "ball of clumped stuff", is one probably awful but fairly accurate rewording) but I couldn't quickly find another usable place to use to explain that via a link on the isolated word itself. If you feel it lacking, you can try to find a better wording/link yourself (to satisfy your own need for information) and make the change so that nobody else finds it lacking. [[Special:Contributions/172.70.86.127|172.70.86.127]] 13:56, 28 February 2023 (UTC)

Talk:78: Garfield

2024-04-18T21:28:38Z

172.70.163.48: Undo revision 339991 by Z1mp0st0rz (talk) Clearly an aborted edit.

I disagree with the original author of the article, I don't think Garfield is poorly written. However, to avoid any greater conflict, I decided to keep it as it is. Does everyone else think it is "poorly written"? --[[User:Pnariyoshi|Pnariyoshi]] ([[User talk:Pnariyoshi|talk]]) 21:56, 28 January 2013 (UTC)
:There was certainly controversy sparked within the comic writing community when Bill Watterson, the creator of Calvin and Hobbes, quit early because he felt that cartoonists targeted their comics at too wide a market to be meaningful and funny. This was at the gestation of the internet, when the only funding that a cartoonist could find was from newspapers looking for something to fill the back page, and had to follow the newspaper's guidelines for neutrality to avoid offending anyone. Watterson called other cartoonists "sell-outs" for dumbing down their work for the mass-market, and he quit in disgust at his own newspaper's attempts to cull the philosophical speeches that were ever-so-common in Calvin and Hobbes. Since then, widespread corporate culture has made Dilbert a hit, and we ourselves are discussing XKCD here. Watterson would be smiling right now. '''[[User:Davidy22|Davidy22
He wouldn't. In an interview with the curator of the Billy Ireland Cartoon Museum in Cleveland, he explained that webcomics, while boundary-pushing, are 1) not as easy to access and 2) a solitary experience, as opposed to a family passing a newspaper around the table and offering different interpretations. (Let me point out that while we do share our comments, we get no immediate feedback, and our conversations are anonymous, not as casual as a family talking). It is interesting to note that Calvin and Hobbes has now run more than twice as long in repeats as in first-run. [[Special:Contributions/172.68.255.92|172.68.255.92]] 14:38, 6 March 2018 (UTC)
]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 00:44, 29 January 2013 (UTC)
::Wow, that was incredibly instructive. I'm actually very excited about this discussion. While I do agree "dumbing down" something that was originally intended for a specific niche is what ruins a lot of media (besides comic strips, I feel it commonly ruins TV shows, Movie adaptations etc), I think it would be unfair to call it "poorly written". I think a better word would be "unexciting", "lacking passion" or "having lost it's first love". Making a strip appeal to a wide range of people is not always as easy as it seems, especially without making it come down to bathroom/sexual jokes. While I do feel that Randall sometimes gets very close to the border of "distasteful", I think xkcd still maintains its roots and it is pretty funny and smart. --[[User:Pnariyoshi|Pnariyoshi]] ([[User talk:Pnariyoshi|talk]]) 02:25, 29 January 2013 (UTC)
:::Hi there, I'm the original author of the page in question. I do not mind if it is changed or even removed. [[Special:Contributions/98.162.150.124|98.162.150.124]] 02:08, 20 April 2013 (UTC)

I definitely agree that Garfield isn't poorly written, but it is basically lacking in creativity at this point. The underlying point remains however, and that is that the 'mainstream' all suffers from that same mass appeal sickness, which is rather outmoded in the modern era.{{unsigned|Crazedhatter}}

I don't have a particular opinion on whether this page says Garfield is "poorly written" or not, but I do think that most of the people arguing against it are undermining their own points. Pnariyoshi: If a piece of writing is unexciting and passionless, is this not grounds on which one could say it is "poor?" Crazedhatter: If a piece of writing lacks creativity and is outmoded for its own era, is that not also grounds on which one could say it is "poor?" If we all agree that there are serious artistic flaws with Garfield's writing, then why are we quibbling about synonyms? Call it "poor." [[Special:Contributions/71.201.53.130|71.201.53.130]] 15:13, 9 October 2013 (UTC)

Is this appeal possibly made with the 'Death of Garfield' plot-arc in mind (which, while not a great series of strips, was moderately interesting for its as Garfield not written for mass appeal)? I only ask because it would seem a relatively futile challenge were it not for the fact that Jim has actually strayed this way before; also, both xkcd's parody Garfield and the Death of Garfield series are horror-themed. [[Special:Contributions/143.92.1.32|143.92.1.32]] 01:14, 21 October 2013 (UTC)

What is happening in the last picture of Garfield? I mean the line across its face. As if there were two different photos on top of eah other, where the upper one was half removed. Maybe a suggestion from Randall that it is time to reveal the true Garfield...
[[Special:Contributions/141.101.96.221|141.101.96.221]] 16:50, 2 December 2014 (UTC)
:I think that's just part of the surreal aspect. --[[User:Calion|Calion]] ([[User talk:Calion|talk]]) 11:30, 28 February 2023 (UTC)

Davis did this once, a long time ago. You can read it [http://popzeuscomic.blogspot.com/2007/03/disturbing-garfield-comic-strips-from.html here]. Of course, they kept the series running after that, though Davis has stated multiple times he's indifferent about Garfield and only made it as a way of making money. --[[Special:Contributions/141.101.104.17|141.101.104.17]] 14:40, 23 December 2014 (UTC)
:In my mind, the Twilight Zone narrator spoke the text boxes... [[User:Fabian42|Fabian42]] ([[User talk:Fabian42|talk]]) 11:16, 11 June 2018 (UTC)
:Wow! That definitely counts as exactly what Randall was suggesting! Thanks for the link!--[[User:Calion|Calion]] ([[User talk:Calion|talk]]) 11:30, 28 February 2023 (UTC)

Funnily enough, these kind of surreal Garfield comics recently rose in popularity on places like reddit.com/r/imsorryjon

i find it possible this was inspired by the garfield strip that aired on january 7th 2002: https://www.gocomics.com/garfield/2002/01/07 . very similar pose and weird half-different face--[[Special:Contributions/172.70.230.3|172.70.230.3]] 13:47, 15 October 2022 (UTC)

2920: Survey Marker

2024-04-17T08:32:45Z

172.70.163.48: /* Explanation */

{{comic
| number = 2920
| date = April 15, 2024
| title = Survey Marker
| image = survey_marker_2x.png
| imagesize = 740x272px
| noexpand = true
| titletext = Fun fact: The standard North American NAD83 coordinate system is misaligned from the actual Earth, off-center by about 7 feet. Someone knows where I am, and I'm in the wrong place.
}}

==Explanation==
{{incomplete|Created by a GUIDED MISSILE THAT MISSED THE TARGET DUE TO COORDINATE DRIFT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
Cueball and Megan have found a {{w|survey marker}} on the ground. Survey markers such as these are used as reference points for the {{w|North_American_Datum|NAD 83 and NAVD 88}} geodetic reference systems, and the {{w|U.S. National Geodetic Survey}} has a database storing the coordinates of these markers. However, those two systems are being replaced by the {{w|National_Spatial_Reference_System#Datum_of_2022|New Datums of 2022}} (delayed to 2024-2025), which is primarily based on satellite systems and gravimetric models.

When they update the database, in the comic Cueball's position, both horizontal and vertical, changes to compensate, leaving him panicking in mid-air. In reality, updating a database to change the coordinates of a location would not physically move items at the location.{{Citation needed}} Arguably, if they did, no-one would much notice, since everything surrounding them should similarly move simultaneously to its corrected position as well. However, this shifting does not seem to apply to Megan. This might be because she is still standing next to the survey marker, while Cueball is standing at the point in the database; Cueball's comfort in being at an ''exact'' known location has opened up an unexpected vulnerability. Or perhaps it is simply due to Megan being prepared for the update unlike Cueball.

The title text refers to NAD 83 being around 7 feet off. This is in reference to both {{w|World Geodetic System|WGS84}} and presumably the New Datum.

Absurd outcomes from differing survey standards was also the topic of [[2888: US Survey Foot]].

==Transcript==
:[Zoomed in view of a round marker on the ground, with small specks of dirt around it. There is one line of text going around the central part in the outer rim of the marker, with the first three words written around the top, and the last two words written around the bottom (thus not text that are going all the way around in one single line). Inside this rim there are more text on three lines. In the center there is a small cross in a triangle pointing up in relation to the central text. There are more unreadable text below the last line of text and around the inner part of the rim. And off panel voice, which in the next panel turns out to be Cueball, is written above the mark.]
:U.S. Geological Survey bench mark
:Elevation above sea 447 feet
:Cueball (off-panel): I love finding these survey markers. It's somehow reassuring.

:[Cueball and Megan are shown as they look down on the marker. Cueball has one leg on either side of the marker and Megan stands to the right.]
:Cueball: I like that someone, somewhere, knows where this spot is.
:Cueball: If I stand on it, they know where '''''I''''' am.

:[Cueball and Megan looks up at each other.]
:Megan: But the NAD83 and NAVD88 datums are getting replaced soon. That marker's coordinates could shift by like 5 feet.

:[Megan is looking down at her phone in her hand, standing in the same place in relation to the marker. Cueball is now floating in the air behind her 5 feet above the ground, while flailing with his arms and legs (as shown with three small curved lines at the end of either arm and above and below him.)]
:Megan: Oh look, it just got updated.
:Cueball: '''''Hey! Put me back!'''''

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Geography]]
[[Category:Fun fact]]

2916: Machine

2024-04-15T08:18:24Z

172.70.163.48: /* Explanation */

{{comic
| number = 2916
| date = April 5, 2024
| title = Machine
| image = machine_2x.png
| imagesize = 740x740px
| noexpand = true
| titletext = The Credible Machine
}}
* To experience the interactivity, visit the [https://xkcd.com/2916/ original comic].

==Explanation==
{{incomplete|Created by a WELL OILED ROBOT. Do NOT delete this tag too soon.}}
This interactive game is the 14th [[:Category:April fools' comics|April fools' comic]] released by [[Randall]]. The previous April fools' comic was [[2765: Escape Speed]] from 2023, which was released on Wednesday, April 19, 2023.

As referenced in the title text, this game is a spiritual successor to the 1990s and early 2000s PC puzzle game series {{w|The Incredible Machine}}, a game Randall played as a kid. Both games have several objects in common:
* fan
* cat
* ramps
* balls of various density

The comic starts in a main screen where the user can create a {{w|Rube Goldberg machine}} in a "Cell" where the goal is to route a constant stream of colored balls from inputs on the ceiling or walls to outputs of matching colors on the walls or floor. After the comic is first opened a window pops up over the machine where Cueball in a lab coat tells you to route the balls from the inputs to the outputs. A button opens a “tool panel” where there are large and small boards available for use, as well as some gimmicky stuff like prisms (which deflect marbles) and fans (which blow marbles around), and decorative elements which have no effect on the balls.

Typically, inputs and outputs only accept balls of a single color. However, some outputs accept multiple colors, indicated by a double arrow, and some inputs produce multiple colors. When the player is designing their 'machine', this will involve multiple full streams merged into one (supplied by a double-exit on the adjacent submission). Machines now working in the full grid may, however, find that their sources now contain stray balls of other types that were not handled properly, but there is no way to force a re-edit of the machine to alter its behavior to account for this.

If any balls are left in your cell for more than 30 seconds, they fade away. The first time a ball fades away another popup informs you that the balls are removed for security reasons. An indicator next to each exit increases for each ball of the correct color that passes through an exit, and reduces when no balls pass through, or if balls of the wrong color pass through it. While that exit is not properly supplied it displays a red cross, which changes to a green tick when a sufficient, and sufficiently clean, stream of balls is supplied. The first time you have built a machine which succeeds in routing enough balls of the correct color to ''all'' relevant outputs, a popup will prompt you to submit your cell to be added to the public machine. (Subsequently, the submit button will quietly change from 'inactive' (pale) to clickable (dark). This will change back again if any ball transfers dip back below the required threshold for any reason, such as further editing or an end to a 'fluke' glut of accumulated balls.)

Choosing to submit your cell will give you a textbox to give this cell a name. Proceeding through that, you will now see your cell within the 'grid' and a 'live' feed of balls from any relevant neighboring cells (which may be more sporadic then the feed you designed your cell with, and contain stray balls of different types). If any supplying-neighbors are still marked as "under construction", they ''may'' provide the balls as if perfectly routed from their own (eventual) source, but will eventually dry up. If your newly submitted creation is placed in the lowest row of cells, balls will be dispensed through the exit at the bottom, but there will be no launcher to propel them towards the pit, and they will vanish as they leave the exit.

If you refresh, the cell that your creation was in will likely be under construction, or replaced with someone else's machine. However, other people's machines are consistently placed, so it appears that there is some moderation process selecting a machine for each cell out of the machines submitted by users. It is unknown exactly how and why a particular submission becomes a permanent part of the grid. Given the number of 'bottom-layer' cells that are likely primed ready to be completed (e.g. the grid-width of twelve, perhaps staggered across adjacent rows) and the many possible worldwide contributors at any one time, it may be that the chances of being picked for permanence is low; and certainly would have been early on in the comic's existence during the initial frantic rush to participate.

<gallery heights="200" widths="150">
File:2916_popup_intro.png|Introduction popup
File:2916_popup_time.png|Time limit popup
File:2916_popup_submit.png|Submission popup
</gallery>

The button in the bottom right corner allows you to toggle between editing your own machine and a page where you can drag around to view all of the machines that have been submitted and accepted, with a title for each in the upper left corner. In this view you can see that all of the outputs are also inputs for another cell, except for the top row where the inputs come from off screen and the lowest row which output through a launcher of some kind to a set of four colored-coded containers far below. Any empty cells are marked off by yellow tape with the words "UNDER CONSTRUCTION" as well as "DJIA ↑ 31415" once in each cell. "DJIA" stands for the Dow Jones Industrial Average, with "DJIA ↑ 31415" indicating that it rose to 31415 points, 31415 being the first five digits of pi, without the period. This would often be displayed on a yellow 'ticker', which might look superficially similar to the yellow barrier tape.

When viewing the whole machine, a button in the bottom left corner, added later, allows you to follow the path of the nearest ball as it passes from cell to cell. This will also make the ball you are following immortal - not subject to the 30s timeout rule. Another later addition was a button in the top left corner which copies a URL that will take you directly to the current cell that you are viewing. However, the link that is created will always show you the version of the machine at the time that you were viewing it, without any subsequent additions.

Whenever balls reach the bottom of the grid, they are directed towards four containers, one of each color. Most balls are accurately sent to their appropriate container, though there are some misfires. These containers are above a pit, and periodically dump their contents. Balls in the pit are subject to the same 30s culling rule as balls in the cells above. If no balls are directed towards the containers, the pit will be empty. If one or two streams of balls are making it, Cueball and Megan sit in a small boat named the USS Buoyancy, and when sufficient balls are being deposited, the boat begins to float and move. More streams of balls are likely to add more changes. Balls which miss or overspill the pit fall out of the bottom of the frame.

Under construction cells will feed balls of the appropriate color into neighboring cells so long as you are not looking at them. Once you scroll to look at them, the supply of balls stops and subsequent cells in the chain will not receive any; scroll away from them again and the supply will resume.

The grid is 12 cells wide, and grows in height. The largest size observed so far is 12x65, for a total of 780 cells. The machine's height is determined by the lowest cell; This can be either your submitted cell, or a cell created by another user.

Imperfections in the machines (whether accidental or by design) and the impossibility of entirely avoiding collisions when crossing streams inevitably lead to significant levels of losses and pollution with the wrong color balls. Indeed, using the follow ball trick (see Trivia) appears to show that it is quite rare for a ball to survive more than several machines without getting stuck somewhere. This implies that there is some 'creative accounting' going on to ensure that cells lower in the grid still have balls to process - simulating flow only for a few nearby cells, while assuming that those cells themselves have pure, steady inputs.

There is a hard limit of 100 items (both physically interactive and purely decorative) that can be placed in any given arena. If you have placed 75 items, a count will appear in the component bar of your piece-count ("''##''/100"), which will go away again if you delete items to below the limit. The count text turns red at "100/100", at which point no more items can be added, only existing ones moved (or removed, to lower the count again).

===Toolbox items===
{| class="wikitable" style="margin:auto"
|+ List of objects
|-
! Description !! Effect !! Image
|-
| Plank || Static obstacle || [[File:2916_plank.png|frameless|upright=0.25]]
|-
| Hammer || Static obstacle || [[File:2916_hammer.png|frameless|upright=0.25]]
|-
| Sword || Static obstacle || [[File:2916_sword.png|frameless|upright=0.25]]
|-
| Hinged scoop&dagger; || Rotates around its hinge, tries to stay horizontal with a springy effect || [[File:2916_scoop.png|frameless|upright=0.25]] [[File:2916_scoop_mirrored.png|frameless|upright=0.25]]
|-
| Anvil || Static obstacle || [[File:2916_anvil.png|frameless|upright=0.125]]
|-
| Brick || Static obstacle || [[File:2916_brick.png|frameless|upright=0.125]]
|-
| Fan || Blows away balls in front of it. Different colors are affected by differing amounts (yellow balls are lightest, and can be levitated above an upward-facing fan).|| [[File:2916_fan.png|frameless|upright=0.125]]
|-
| Pillow || Balls will not bounce if they hit it || [[File:2916_pillow.png|frameless|upright=0.125]]
|-
| Bumper || Bounces balls away at significantly higher speed || [[File:2916_round_bumper.png|frameless|upright=0.125]] [[File:2916_bumper_left.png|frameless|upright=0.125]] [[File:2916_bumper_right.png|frameless|upright=0.125]]
|-
| Attractor/Black Hole* || Pulls balls toward center || [[File:2916_attractor.png|frameless|upright=0.125]]
|-
| Repulsor/White hole* || Repels balls away from center || [[File:2916_repulsor.png|frameless|upright=0.125]]
|-
| Prism || "Refracts" and internally-reflects balls as they otherwise pass through the object, the color of the ball ''may'' cause them to react (as much as possible) according to the respective color across the element. || [[File:2916_prism.png|frameless|upright=0.125]]
|-
| Wheel&Dagger; || Spins, deflects balls, can jam with enough resistance (e.g. glut of balls or against other elements). || [[File:2916_wheel.png|frameless|upright=0.125]]
|-
| "Good job" trophy || Static obstacle || [[File:2916_trophy.png|frameless|upright=0.125]]
|-
| Glass cup || Static obstacle. Container, with a nominal capacity of up to four balls (in whole or in part) within it. || [[File:2916_cup.png|frameless|upright=0.125]]
|-
| Cat || Swats away balls in front of itself (was added later) || [[File:2916_cat_new.png|frameless|upright=0.25]]
|-
! colspan="3" style="text-align:center" | Non-physical items
|-
| Right-facing Ponytail, with raised arms || Intangible decoration || [[File:2916_ponytail_arms.png|frameless|upright=0.125]]
|-
| Right-facing Ponytail, standing || Intangible decoration || [[File:2916_ponytail.png|frameless|upright=0.125]]
|-
| Left-facing Cueball, with raised arms || Intangible decoration || [[File:2916_cueball_arms.png|frameless|upright=0.125]]
|-
| Left-facing White Hat, standing || Intangible decoration || [[File:2916_whitehat.png|frameless|upright=0.125]]
|-
| Rightwards-facing Knit Cap, in an 'action' pose || Intangible decoration || [[File:2916_knitcap_resting.png|frameless|upright=0.25]]
|-
| Right-facing Knit Cap, standing || Intangible decoration || [[File:2916_knitcap.png|frameless|upright=0.125]]
|-
| Helmet-wearing figure, standing || Intangible decoration || [[File:2916_helmet.png|frameless|upright=0.125]]
|-
| Squirrel || Intangible decoration || [[File:2916_squirrel.png|frameless|upright=0.125]]
|-
| "Probably Deterministic" sign || Intangible decoration || [[File:2916_deterministic.png|frameless|upright=0.25]]
|-
| [[1682: Bun|Bun]] || Intangible decoration || [[File:2916_rabbit.png|frameless|upright=0.125]]
|-
| Cat || Intangible decoration || [[File:2916_cat.png|frameless|upright=0.125]]
|}

:<nowiki/>* — The Attractor and Repulsor are omnidirectional, but the area of effect can be resized to extend or restrict its influence. You do this by way of its bounding box with corner and mid-edged 'drag nodes' and a circular area that shows the current extent, which are only visible when the element is actively selected. This resize can be no larger than will make the box/circle touch the edges, no smaller than the fixed graphic and will always be identically proportioned in both axes.

:&dagger; — The hinged scoops are strictly horizontal, on building. They will rotate away from and (spring back to) horizontal according to interactions with balls or other non-decorative items that may be placed to disturb their balance, sometimes with further interesting interactions (that may or may not be intentional or useful). There are two selectable versions of this item. (The only ''other'' object class with a clear (and practical) asymmetry, for which a mirrored chirality can be chosen from the sidebar, are the two versions of triangular "Bonk"-bumpers.)

:&Dagger; — The wheel is an actively rotating element that starts off, by default, spinning anticlockwise. Pressing or tapping left/right arrow keys, when a placed wheel is selected, will adjust that wheel's rotation rate to be more/less anticlockwise. Adjusting it beyond zero rotation allows you to make it spin in the opposite direction.
:Rotation can be increased well beyond the point at which the {{w|wagon-wheel effect}} occurs, which may make it difficult to work out the spin direction of an overspeed wheel element (and thus which arrow keys will slow or speed up its rotation, if you have forgotten), though observing its impact upon any balls that strike it ''should'' make its current spin-direction obvious.
:The 'bounding editing box' will usually appear rotated, possibly according to the spinning graphic's current orientation upon selection, but remains at that (often non-orthagonal) angle even as the wheel spins (if it can) during this period of selection for editing.

All other items can be manually re-angled by a 'loop node' arm extending from the bounding box. If you cannot see the 'angle node' for such a selected item, which is normally at the top of any freshly placed item but follows any re-angling that may have already applied, it could be that you have placed the item too close to the edge in which direction the node extends. To rotate it, move the object away from the edge to access the construction node (after which, you can drag the object back if required – but see below).

Rotation may be limited by the {{w|minimum bounding box}} that is the 'selection box', this is not necessarily the more flush {{w|convex hull}} of the collision-map built into the graphic. Should a corner of the bounding box need to move across the edge of the build-area, it will do nothing more than touch the edge until there is sufficient angle-drag to snap it to the angle from which that corner now comes back away from the edge; or, when it has a long straight edge currently flush with the edge boundary, it may snap to exactly 180°, in rotation, whereupon the opposite long straight edge is flush to the construction area edge. All objects that are drag-moved, similarly, cannot be moved any further than their current bounding box touching the construction-area edging. The bounding box for the rotating wheel is a notable exception to this, being not under any direct angle-control by the player. Instead, it seems to use the bounding inscribed circle that defines the wheel edge iteslf.

Apart from some interactions between the hinged scoops and any element (including other hinged scoops), there is no preventative 'collision detection' between objects during user-placement, which may overlap/cover each other (the most recently spawned item graphically overlays any earlier one). The wheel object will only spin if not constrained by other physical elements (including the spokes of an adjacent wheel, not in counter-rotation) but can still be dragged and placed anywhere within the boundary of the construction area.

The continuous stream(s) of balls respect all ''tangible'' objects, which includes any currently being dragged/rotated, though may prematurely vanish if forced between two items moved to touch/overlap each other. It is possible to to indirectly nudge balls by carefully moving a tangible object's surface into them (or holding them within it, e.g. the "cup"). This may be useful for rescuing temporarily stray balls (before they time-out anyway), unjamming an area with a construction-induced glut ''or'' for testing a ball-path that is not currently being fed 'naturally'. Doing so ''can'' then conceivably fulfil all the exit-gate requirements (temporarily), as it might also transiently spoil some required routing, but the manual intervention will not be possible once a 'machine' has been submit.

===Non-player items===

Ball containers at the bottom of the machine
{|
|[[File:2916_container_red.png|thumb|center|50px]]
|[[File:2916_container_yellow.png|thumb|center|50px]]
|[[File:2916_container_blue.png|thumb|center|50px]]
|[[File:2916_container_green.png|thumb|center|50px]]
|}

Cueball and Megan in the ''USS Buoyancy''
[[File:4d425c.png|thumb|left|150px]]
 

Pit below the ''USS Buoyancy'' (not to scale)
[[File:2916_pit_bottom.png|thumb|left|300px]]
 

=== Color routing ===
The different ball colors have different physical properties. Red balls are more bouncy than other balls, green balls are heavier, and yellow balls are lighter and slightly bouncy. The following values were extracted from the code:
{| class="wikitable sortable"
! Color
! Mass
! Density
! Restitution (bounciness)
! Linear damping (drag)
|-
! data-sort-key="00F" | Blue
| 0.08
| 1
| 0
| 0
|-
! data-sort-key="F00" | Red
| 0.08
| 1
| 0.8
| 0
|-
! data-sort-key="0F0" | Green
| 0.75
| 9.325
| 0
| 0
|-
! data-sort-key="FF0" | Yellow
| 0.024
| 0.3
| 0.6
| 2
|}

For certain combinations of inlet and outlet 'gates', it is necessary to 'cross the streams'. e.g. to direct righthand-entry balls to a lefthand-exit and vice-versa. It is possible to just construct the field to send two (or more!) sets of balls to fly across a common gap, to land on an appropriate reception area that leads to the chosen exit. But, though this is not {{w|Proton pack#Crossing the streams|completely inadvised}}, the timing of the balls cannot be guaranteed to be in sync (or, rather, anti-sync) with each other and collisions ''will'' occur, especially under the variations of delivery that might significantly alter the ballistic path across the gap. Even if the trial machine works, in isolation with a steady stream of all balls entering the field of play, once submitted it will inevitably be fed by a more chaotically-routed preceeding construction.

In order to maintain sufficient correct arrivals at exits, it may be necessary to add a method of filtering the hues.

This could just mean introducing a 'wrong hue trap' beyond any crossing point(s) that send the occasionally wrong ball back to the cross point (or let them time-out in a dead-end, relying upon few enough failures from the rest of the balls, along with all colliding balls that subsequently missed ''any'' chance of reaching an exit). Alternatively, two (or more) feeds of marbles could be fed through a deliberate 'sorter' that does a sufficiently reasonable job of separating the combined sets out towards their intended target-exits.

The various physical qualities of the balls suggest a number of methods for redirecting separate hues to separate onward journeys. This can be done by isolating a hue from every other hue, then passing on (if necessary) to a setup extracting a different one from the remainder, and perhaps also a third time. It may also be possible to merge 'arrangements' of sorting mechanics to efficiently distribute straight into three ''or even four'' onward tracks towards the desired outputs, but that is left as an exercise to the reader.


{| class="wikitable"
! style="background-color:black; color:white" | To separate !! style="background-color:lightblue" | Blue !! style="background-color:lightgreen" | Green !! style="background-color:yellow" | Yellow !! style="background-color:red" | Red
|-
! style="background-color:red" | Red
| *R/B* | '''Use 'bounce''''
The sole difference is how much balls will rebound from objects. Well managed and constrained ricochets should allow a sorting action.
| *R/G* | '''Use mass or 'bounce''''
Green balls cannot be levitated by a vertical fan. An incline across any such fan(s) will levitate only non-Greens. Green, like Blue, rebounds differently to Red. Green balls are also affected by black holes much less than all other balls.
| *R/Y* | ''See Y/B''
| *R/R* style="text-align: center; background-color:black; color:white" | n/a
|-
! style="background-color:yellow" | Yellow
| *Y/B* | '''All methods'''
Yellow, alone, exhibits high drag against any unforced motion. It is also unique in all other ways; e.g. can be levitated highest, against all other hues (though most profoundly against Green).
| *Y/G* | ''See Y/B''
| *Y/Y* style="text-align: center; background-color:black; color:white" | n/a
| *Y/R* style="text-align: center; background-color:gray" | ''See Y/B'' 
|-
! style="background-color:lightgreen" | Green
| *G/B* | '''Use mass'''
Green balls cannot be levitated by a vertical fan. There is also a not so marginal difference in density that might be exploited, such as by using black holes, which only minimally effects Green (perhaps showing an effective difference between mass of attraction and mass of inertia).
| *G/G* style="text-align: center; background-color:black; color:white" | n/a
| *G/Y* style="text-align: center; background-color:gray" | ''See Y/B'' 
| *G/R* style="text-align: center; background-color:gray" | See R/G
|-
! style="background-color:lightblue" | Blue
| *B/B* style="text-align: center; background-color:black; color:white" | n/a
| *B/G* style="text-align: center; background-color:gray" | See G/B
| *B/Y* style="text-align: center; background-color:gray" | See Y/B
| *B/R* style="text-align: center; background-color:gray" | See R/B
|}

Even when not strictly necessary for one's own submission, once submitted into the full playing grid the player's own contribution may find itself working with less 'pure' delivered ball-streams (from an imperfectly separating feed-in contribution). It is possible that this more interactive disruption can make the new setup behave erratically or even entirely incorrectly.

It might be thought good practice (but not ''necessary'') to deliberately combine any or all inputs and do a full job of splitting them again, just in anticipation of possibly having to deal with such cross-contamination and being able to 'clean up' the onward stream(s) for the benefit of others. This would of course be particularly difficult if the isolated building-phase does not provide all four hues to 'test' against, so any speculatively added filtering would have to be added 'blind' (and only on the offchance that any anticipated incorrect balls will actually enter the arena) and without any legitimate exits to which such rejects could be shunted (therefore could accumulate, up until any 'time out' that might apply to any ball once operational as part of the combined grid).

Single-input/single-output designs might not particularly require ''any'' sorting mechanism, in theory, though the unexpected 'contamination' of the system with balls of different masses/etc could perhaps introduce malfunctioning passage from the added chaos it might succumb to.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[The placeholder image shows four balls, colored red, green, yellow and blue, bouncing on top of three white blocks. Text in the center: "[visit xkcd.com to view]"]

:[Cueball with lab coat, intro popup]
:Cueball: Balls falling into your cell should be routed to the outputs at a steady rate.

:[Cueball with lab coat, warning popup]
:Cueball: For security reasons, balls that remain in your device for more than 30 seconds will be removed and destroyed.

:[Cueball with lab coat, submit popup]
:Cueball: Congratulations! Your contraption has passed all tests. Press [submit button] to submit it to be added to the machine!

==Trivia==
Once again an April Fool's Day Comic came out late, as Randall did not release this on April 1st, even though April 1st did fall on a Monday, a normal release day. It first came four days later with the Friday release on April 5th. That this is to be considered an April fools' comic, in spite of the later release, was confirmed on the xkcd Facebook page.

*Randall acknowledges the people who helped him create this comic in a [[Header_text#Machine|comic-specific header text]].
**With 11 different involved apart from Randall this is by far the comic with most people involved.
*Some hidden keyboard shortcuts have been found:
** Follow balls: Ctrl + Alt/Option + B (now also accessible by using the button provided)
** Show debug overlay: Ctrl + Shift + Win/Cmd + D
*** This may particularly clash with browser functionality, e.g. Firefox's "New Bookmarks" dialogue which will need closing, though still activating the overlay graphics.
** Delete selected item: Delete (Fn + Delete on Mac)
*When Randall posted a [https://www.facebook.com/TheXKCD/posts/pfbid0Cs97awQZi1ZiaEXouAex9tXrwAS3qJV3RmAiuCq5uvZQwqZVMgDmcqJ7JU9LYodYl link to this comic] on his [https://www.facebook.com/TheXKCD Facebook feed], he directly wrote that it was a late April Fools' Day!
**MACHINE
**Happy Belated April Fool's Day!
**This thus ends any discussion of whether this should be seen as an April Fool's comic or not.
**It just came out 4 days late. This has also happened several times since [[Garden]].
[[File:2916 Machine Facebook April fools' confirmation.png]]

{{comic discussion}}

[[Category:April fools' comics]]
[[Category:Comics with color]]
[[Category:Dynamic comics]]
[[Category:Comics with animation]]
[[Category:Interactive comics]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring White Hat]]
[[Category:Comics featuring Knit Cap]]
[[Category:Characters with hats]]
[[Category:Squirrels]]
[[Category:Buns]]
[[Category:Cats]]

1504: Opportunity

2024-04-13T09:54:38Z

172.70.163.48: /* Explanation */ Clarify the "alternate history(/future-as-was)", better. Change from two quick "supposedly"s. Allow for the possibility that it was *always* aggressive (hence operating beyond expectations), only later had chance to show its true nature.

{{comic
| number = 1504
| date = March 27, 2015
| title = Opportunity
| image = opportunity.png
| titletext = We all remember those famous first words spoken by an astronaut on the surface of Mars: "That's one small step fo- HOLY SHIT LOOK OUT IT'S GOT SOME KIND OF DRILL! Get back to the ... [unintelligible] ... [signal lost]"
}}

==Explanation==
This comic is talking about the robotic science platform {{w|Opportunity (rover)|''Opportunity''}}. On January 25, 2004, two rovers, named ''Spirit'' and ''Opportunity'' were landed on the surface of {{w|Mars}} for the purpose of gathering data about the surface of Mars. The original plan called for these rovers to function and collect data for 90 days on the surface.

Both rovers proved to be remarkably robust, with ''Spirit'' functioning for 6 years, 24 times longer than the original mission plan, before it became stuck in a sandstorm, which covered its solar panels. This was covered in [[695: Spirit]], in which the Spirit rover is also portrayed with an anthropomorphic personality.

Even after ''Spirit'' ceased to function, ''Opportunity'' continued to operate. As of the publication of this strip, it had been operating for over 11 years. This comic extrapolates the rover's resilience to absurdity for comedic effect, implying that the rover begins to operate independently, even with its original power sources disconnected, and presumably developing some form of general intelligence. It then takes a darker turn, implying that ''Opportunity'' attacks both later rovers and even human astronauts that later land on Mars. This evolution is similar to the stories of {{w|HAL 9000}} (from {{w|2001: A Space Odyssey (film)|''2001: A Space Odyssey''}}) and {{w|List of Star Trek characters (T–Z)#V'Ger|V'Ger}} (from ''{{w|Star Trek: The Motion Picture}}''), both of which became dangerous to human beings. The final panel suggests that humans eventually manage to terraform Mars, but that ''Opportunity'' grows so powerful that humanity cedes half the planet to it.

In real life, as of Feb 12th, 2019, the Opportunity rover has finally been {{w|Opportunity mission timeline|declared dead}} after 5352 Sols (Mars Days) or 5500 Earth days on Mars. On Feb 13th, 2019, [[Randall]] eulogies the Opportunity Rover in [[2111: Opportunity Rover]].

They mention another Martian rover, {{w|Spirit (rover)|''Spirit''}} that was also sent to Mars on the same date as Opportunity. Unfortunately, it became stuck and a sandstorm covered its solar panels. On March 22, 2010, it was thought that Spirit's batteries finally ran out, marking the end of its mission. This was covered in [[695: Spirit]], in which the Spirit rover is also portrayed with an anthropomorphic personality.

In 2023, the comic's timeline version of Opportunity is said to be still moving despite having supposedly no power source. It also started to show aggression in the span of 8 years and deactivated the {{w|Mars 2020|Perseverance rover sent in 2020}}. [[Cueball]] and [[Megan]] can't explain how it moves, but investigating is now too dangerous. This evolution is similar to the stories of {{w|HAL 9000}} (from {{w|2001: A Space Odyssey (film)|''2001: A Space Odyssey''}}) and {{w|List of Star Trek characters (T–Z)#V'Ger|V'Ger}} (from ''{{w|Star Trek: The Motion Picture}}''), both of which became dangerous to human beings. This, however, never ended up happening, as Opportunity "officially" stopped working on June 10, 2018.

"Everything the light touches" is a reference to a line by {{w|List of The Lion King characters#Mufasa|Mufasa}} in ''{{w|The Lion King}}''. Mufasa's son {{w|List of The Lion King characters#Simba|Simba}} then asks "What about that shadowy place?" and Mufasa tells him "That is beyond our borders. You must never go there". This was used again in [[1608: Hoverboard]], where [http://www.explainxkcd.com/wiki/images/a/a0/1608_0986x1076y_Our_kingdom_from_a_cliff.png Cueball tells the same line] to Ponytail in the left part of the world. In the ''[[what if? (blog)|what if?]]'' article ''[https://what-if.xkcd.com/48 Sunset on the British Empire]'', concerning the end of the sun shining on the British Empire, Cueball tells a child that everything the light touches is their kingdom, and the child asks (in the title text) "What about that shadowy place over there?" to which Cueball replies (also in the title text), "That's France. We'll get it one of these days."

The title text forecasts the first words of the first astronauts on the surface of Mars. At first, the astronaut copies the first words of {{w|Neil Armstrong}} on the Moon ("That's one small step for [a] man, one giant leap for mankind") but it is interrupted by the ''Opportunity'' rover. Opportunity has a drill to collect Martian rock samples, but here it is heavily suggested that the drill is being used as a weapon against the astronaut.

==Transcript==
:[The year (or year and first sentence) for each panel is written in a small frame at the top of each panel. It breaks the top frame of the panels.]

:[Ponytail is sitting at a computer, facing left. Hairbun stands behind her.]
:2010:
:Ponytail: After six years, ''Spirit'' is down, but ''Opportunity'' is still going strong.
:Hairbun: Tough little rover!

:[Opportunity traveling on Mars. Text is written in frames with zigzag lines]
:2015:
:Off-screen: Eleven years, wow.
:Off-screen 2: Wasn't the original mission 90 days?
:Off-screen: This is starting to get weird.

:[Cueball and Megan sitting at a computer, facing right.]
:2023:
:Cueball: The battery is totally disconnected. How can it still be moving??
:Megan: Given what it did to the Mars 2020 rover, we may never know.

:[Two Martian inhabitants looking like Cueball and Megan stands on a cliff edge pointing towards a dark, mountainous region. Behind them are a tower and a hover car]
:2450, terraformed Mars, Martian imperial capital:
:Martian Cueball: Everything the light touches is our kingdom.
:Martian Megan: What's that dark area?
:Martian Cueball: That is ''Opportunity's'' half of the planet. We must never go there.

{{comic discussion}}

[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Hairbun]]
[[Category:Multiple Cueballs]]
[[Category:Mars rovers]]
[[Category:Artificial Intelligence]]
[[Category:The Lion King]]

2918: Tick Marks

2024-04-11T14:14:42Z

172.70.163.48: /* Explanation */ Some spiritual similarities.

{{comic
| number = 2918
| date = April 10, 2024
| title = Tick Marks
| image = tick_marks_2x.png
| imagesize = 292x276px
| noexpand = true
| titletext = If you're really savvy, you can hide an entire set of illicit transactions by timing them to draw what looks like a graph inset.
}}

==Explanation==
{{incomplete|Created by a BOT WORKING BEHIND A GRAPH - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

This comic provides the reader with a suggestion on how to "conceal activity" — specifically, in this case, activity happening after what should have been the deadline for completing it — that is going to be graphed over time, by timing bursts of activity with the ticks on the time axis. This is assuming that the scale of the time axis is known, and that the "bottom" of the graph coincides with the line on which the ticks are drawn, rather than the "peak" of the largest tick.

Theoretically, the graphed "activity" would be concealed behind the ticks, meaning anyone reading the graph would perceive activity as having ceased at the deadline, even though it had continued in time-axis-tick-sized bursts afterwards.

The title continues with tips on how to make illicit transactions by integrating them in such a manner that makes them appear to be (or merge into) a graph inset, which would contain relevant information to the graph. For this to work convincingly, it would probably have to be a {{w|scatter plot}} or similar, rather than a {{w|bar chart}} or {{w|line chart}}, upon which carefully crafted datapoints could 'draw' a credible facsimile of [[688: Self-Description|graphical meta-features]].

Variations (or possibly inversions) of pretending that actual data is part of the graphical framing device have also been previously seen in the [[1815: Flag|form]] of [[2528: Flag Map Sabotage|flags]].

==Transcript==
:[A graph with two axes is shown. Each axis has tick marks with every fourth mark a bit longer than those in between. The Y-axis is labeled with text rotated 90 degrees clockwise. There is no label on the X-axis. The graph is a jagged curve with three clear peaks; the area beneath the curve is shaded in light gray. After the third and highest peak the curve drops to zero. At the point of decline, a dotted line goes up to a label above the last peak. To the right of this dotted line, the X-axis and the ticks on it are clearly thicker than the axis and the ticks to the left.]
:Y-axis: Activity
:Label: Deadline

:[Caption beneath the panel:]
:If you need to conceal activity, try timing it to hide behind the tick marks on the graph axis.

{{comic discussion}}

[[Category:Line graphs]]

2916: Machine

2024-04-09T08:55:41Z

172.70.163.48: /* Explanation */

2757: Towed Message

2024-04-06T18:06:38Z

172.70.163.48: /* Trivia */ Worth adding to the mention here. (Not at all mentioned on Monday 3rd, so not creating something new within that one.)

{{comic
| number = 2757
| date = March 31, 2023
| title = Towed Message
| image = towed_message_2x.png
| imagesize = 613x236px
| noexpand = true
| titletext = "Hi, what you do is fly over a designated zone and detach the--" "WE'RE SORRY, THE MOBILE CUSTOMER YOU ARE TRYING TO REACH IS OUT OF SERVICE"
}}

==Explanation==
In this comic, an {{w|Aerial_advertising#Banner_towing|aircraft is towing a banner}}. These aircraft do not take off or land with the banner in tow, but instead have a hook and release mechanism to [https://www.wgbh.org/news/local-news/2022/09/02/the-surprising-way-those-beach-plane-banners-get-airborne add and drop the banner in flight]. The banner ''could'' be interpreted as a recruitment ad by an aerial advertising company looking for additional pilots. But the humorous interpretation is that the banner is a distress signal – the pilot of the aircraft doesn't know how to land, and is hoping that someone will see the banner and give assistance. This makes the banner self-referential, because the presence of the banner (which makes landing difficult) is the very reason for displaying the banner. It is paradoxical, because printing and deploying the banner requires planning,{{Citation needed}} and if the pilot had anticipated that they would need assistance to land with a banner, they could have simply chosen not to deploy a banner in the first place.

The aircraft in the illustration is similar to a {{w|Piper J-3 Cub}}, which is popular for tasks such as towed banners for its low operating cost and good performance at low {{w|airspeed}}.

The title text features a caller who dials the "{{w|555 (telephone number)|555}}" phone number from the banner (see [[#Trivia|Trivia]]) and starts to explain the correct method for landing (detach the banner over a designated empty location then land the plane regularly), but the call is disconnected halfway through. Presumably the number is that of the pilot's cellphone. The call could have disconnected because the aircraft moved out of range of the {{w|cell site}} the phone was connected to and the phone failed to automatically connect to an adjacent cell; or possibly the cell network detected the call on {{w|Cellular_network#Frequency_reuse|multiple sites}} due to the phone's {{w|Mobile_phones_on_aircraft#Technical_discussion|altitude}} and disconnected it from the network; or the plane crashed and the phone was destroyed on impact.

==Transcript==
:[A small propeller-driven high-wing airplane tows a banner from left to right. Around the plane and banner there are four small clouds, two above and two below. There are also five birds far in the background, three above and two below the banner. The text on the banner reads:]
:Do '''''you''''' know how to land a plane that's towing a banner? Call '''555-0127''' now!

==Trivia==
* Phone numbers beginning with "{{w|555 (telephone number)|555}}" are commonly used for {{w|fictitious telephone numbers}} in movies, TV shows, and other related media. The numbers 555-0100 through 555-0199 are specifically reserved for fictional use in North America, and are used to avoid inadvertently publishing someone's real phone number, which might get the owner of the number bombarded with unwanted calls from curious callers.
* Related concepts were shown in [[1897: Self Driving]] and [[1927: Tinder]].
* In a similar joke, a pilot used {{w|skywriting}} to write [https://laughingsquid.com/comedian-hires-pilot-to-skywrite-a-joke-over-los-angeles/ "How do I land?"] as a prank in 2013.
* Banner towing is generally safe for an experienced pilot, [https://www.aopa.org/news-and-media/all-news/2020/november/pilot/imperiled-pickup though not entirely without risk].
* The comic may have been inspired by a recent article in the Washington Post [https://www.washingtonpost.com/travel/2023/03/22/how-hard-is-it-land-plane/] on how a person who is not a pilot is unlikely to be able to land a plane.
* The aircraft in the illustration is similar to a {{w|Piper J-3 Cub}}, which is popular for towing banners due to its low operating cost and good performance at low {{w|airspeed}}.
* Aircraft communication is usually done using {{w|radio}}. The {{w|aircraft emergency frequency}} at 121.5 MHz is reserved for aircraft emergencies including pilots in distress and needing assistance.
* The emphasis on the word "you" in the banner is reminiscent of ads such as the well-known {{w|Uncle_Sam|US Army recruitment poster}}.
* This was the first year since 2017 that [[Randall]] missed the opportunity to release an [[:Category:April fools' comics|April fools' comics]] on April 1st (this comic was released on March 31st and the [[2758: My Favorite Things|next comic]] was released on April 3rd). It seems that [[2765: Escape Speed]] released almost three weeks later, is the interactive comic that was intended to be revealed as the start-of-April special.

{{comic discussion}}

[[Category:Airplane banner]]
[[Category:Aviation]]

2914: Eclipse Coolness

2024-04-06T18:01:09Z

172.70.163.48: /* Trivia */ Based upon information received, almost certainly more the case than the prior "This (and last) year have no April Fools' comic" declaration. Might need rewording a bit.

{{comic
| number = 2914
| date = April 1, 2024
| title = Eclipse Coolness
| image = eclipse_coolness_2x.png
| imagesize = 609x325px
| noexpand = true
| titletext = A partial eclipse is like a cool sunset. A total eclipse is like someone broke the sky.
}}

==Explanation==
{{incomplete|Created by an ILLUSORY ECLIPSE (APRIL FOOLS) - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

A total {{w|solar eclipse}} will occur in North America {{w|Solar eclipse of April 8, 2024|on April 8, 2024}}, a week after this comic. A solar eclipse occurs when the Moon moves between the Sun and the Earth, but in order for it to be a total eclipse, the Sun, Moon and the observer's position on the Earth need to line up nearly exactly, and at the right distances (if the Moon is too far away, the eclipse will be annular, rather than total). When such a phenomenon occurs, there's a "path of totality", referring to the range of locations where such an alignment occurs (though only for a few minutes in each location). Away from, but near to, the path of totality (and outside of the specific time of totality), the Moon partially obscures the Sun. In Boston, where [[Randall]] lives, the Sun will be 93% obscured at the local peak of the eclipse.

The comic refers to the fact that the human eye is very bad at detecting different levels of light intensity. You would think that a 95% eclipse would result in things looking only 5% as bright as normal, but because our irises adjust to diminishing available light, it will still seem light out even at the maximum point of coverage. The dimming light is similar to light in late evening, or on a heavily overcast day, nothing particularly remarkable. Using eclipse glasses (or a simple pinhole camera), it's possible to see the Sun being occluded, but someone unaware that an eclipse was occurring would barely notice that anything was happening.

Within the path of totality, it's a different situation. Though an eclipse for any given locale could be experienced at all times from dawn to dusk, the most effective ones will occur somewhere around the middle of the observer's day. When the Moon fully obscures the Sun, for a brief period of time, the area becomes almost fully dark without the usual or expected {{wiktionary|crepuscular}} transition. Temperatures drop noticeably in a matter of minutes and wildlife (and people) may react in [https://www.nytimes.com/2024/04/04/us/solar-eclipse-animals-pets-zoo.html unusual ways]. The level of light in the rest of the sky is similar to that which accompanies a sunset, but in all directions and without the horizon's red light effect. Most dramatically, the previously unseeable Sun's upper atmosphere can be viewed, as a ring around the dark circle of the Moon, with the naked eye (which should ''only'' be possible once the bright solar disc is obscured, and until it starts to appear again). At the very limits of totality, though perhaps most dramatic at its ending, the smallest sections of the bright solar surface will briefly be the only parts to shine through low points on the Moon's edge to form {{w|Baily's beads}}, or a "diamond ring" effect, not at all visible beyond the narrow central strip of the eclipse.

The graph in this strip points out that the difference between 91% (or even a 99%) eclipse and a total eclipse is dramatic. An almost total eclipse is barely noticeable, while a total eclipse is a visual phenomenon unlike any other. This is a situation where being close to the path of totality and being on it makes a huge difference.

Forbes made a similar reference to total solar eclipses being only worthwhile seeing if in the direct path of 100% totality, with a [https://imageio.forbes.com/specials-images/imageserve/65ef95bf101386371bff5839/2024-04-08-TSE-regional-FUNNY-copy/0x0.png "map of nope"]. The map shows all of North America that's not directly in the 100% path of totality as "Nope" meaning that anyone in those areas won't experience the full "OMG!" experience of the total solar eclipse. The [https://www.forbes.com/sites/jamiecartereurope/2024/03/19/why-every-american-needs-to-see-the-map-of-nope-meme-before-april-8s-total-solar-eclipse/?sh=2aab9ab55725 article] mentions hotels may claim to be close enough to the eclipse with "nonsensical oxymorons like '99% coverage of the full total eclipse'" and that it is common for people to think: "I'm happy to avoid the traffic and settle for 95%'".

The title text simply emphasises the point of the comic - the significant difference between a partial and a total eclipse. It is unclear whether the claim is that a partial eclipse is really 'like' a sunset, while a total eclipse seems like someone broke the sky — claims which would be hyperbolic — or if the intention is to say that the comparison between a partial and total eclipse is equivalent to the comparison between a cool sunset and a broken sky.

Randall has earlier made [[:Category:Total Solar Eclipse 2017|many comics]] about the 2017 total solar eclipse, such as [[1876: Eclipse Searches]] through [[1880: Eclipse Review]] and [[2816: Types of Solar Eclipse]]. Randall and his wife also made plans to see the 2024 eclipse in [[1928: Seven Years]].

Additionally, the graph appears similar to a Dirac delta distribution.

==Transcript==
:[A graph is shown with a curve starting from zero a bit from the left of the Y-axis and from there staying almost at the same height just above the X-axis from left to right, where it again goes to zero a bit from the right end of the X-axis. That is except at the very center of the graph, where the line peaks going to a point high above the top of the Y-axis. An arrow is pointing up on the top of the Y-axis and this axis has a label to the left. The X-axis has no label or arrow, but there are three segments beneath it, two large left and right of the peak and a very small in the middle just under the peak. The two large segments has a double arrow pointing from the two lines at the left and right of their segments, and in the middle of these arrow there are labels. Beneath these segments there is another label with an arrow pointing to the gap between the lines of the two long segments. At the top left of the graph there is a large header with a sub header beneath:]
:<big>How cool a solar eclipse looks</big>
:by position along the path

:Y-axis: Coolness
:Label beneath X-axis left : Partial eclipse zone
:Label beneath X-axis center: Path of totality
:Label beneath X-axis right : Partial eclipse zone

:[Two small dots representing people are drawn a bit to the right of the path of totality zone. Star bursts above these indicate they are speaking with their text shown above them:]
:Left person: We should have a good view here - we're pretty close to the middle of the path.
:Right person: Yeah, this map says the sun will be 91% eclipsed!

==Trivia==
*This comic was released on April 1st and marks the second year in a row that [[Randall]]'s [[:Category:April fools' comics|April fools' comic]] appeared delayed .
**It is the first time a release day has fallen on April 1st without Randall making any note of it, and not since 2009 has there been a comic released on April 1st without it being an April fools' comic.
**That year, however, he found another way to make an April fools'.
**For 2024, the release of [[2916: Machine]], in Friday's 5/April comic slot, seems to fulfil the expected April appearance of a 'special comic'.

{{comic discussion}}

[[Category:Line graphs]]
[[Category:Astronomy]]
[[Category:Solar eclipses]]

2916: Machine

2024-04-06T17:56:13Z

172.70.163.48:

April Fools' Day comics

2024-04-06T17:55:06Z

172.70.163.48: Called it! Oh, ye of little faith...

*Comics (or other happenings related to xkcd) that were put up on {{w|April Fools' Day}} as an April Fools' Day joke. They have been annual, having been featured every year since 2011, except for 2017, 2023 and 2024 (the first time this has been missing two years in a row).

*'''Click''' to expand for a more detailed explanation:
<div class="mw-collapsible mw-collapsed leftAlign" style="width:100%">
 

==Explanation==
In 2006, the first year that xkcd released in March and April, there was no comic released on April 1st and no April Fools' comic was released. The two comics before and after were [[83: Katamari]] from March 31st and [[84: National Language]] from April 3rd.

[[Randall]] first posted an April Fools' comic on Sunday, April 1, 2007. This comic ("[[Syndication]]") was not numbered; sequentially, it came between [[242: The Difference]] and [[243: Appropriate Term]]. It has not been preserved in the official xkcd archives.

For April Fools' Day 2008 [[Randall]] created [[404: Not Found]], which is a meta-comic, since it in fact doesn't exist. But that he considers it a comic is both made clear in the explanation for said "comic" and also since he links to it in his 2018 April fools' comic [[1975: Right Click]], from a fools' menu that links to all his comic alphabetically by title.

The comic for April 1st 2009 had no obvious ties to April Fools' Day, but on that day Randall made an April Fool in another way. See the [[563: Fermirotica#Trivia|Trivia section]] for [[563: Fermirotica]], released that day.

April 1st, 2010 didn't coincide with a comic release. However, on that day the site was altered to mimic a Unix command line interface, the so called [[UniXKCD]]. (This happened wile [[721: Flatland]] was the newest comic, but it was released March 31st and had nothing to do with April Fools' Day, see this [[721: Flatland#UniXKCD|trivia]]).

Starting on Friday, April 1st, 2011 with [[880: Headache]], [[Randall]] has released a real April Fools' Day joke annually, except 2017, 2023 and 2024.

Beginning with the second year in that row, with [[1037: Umwelt]], he moved the release day to Sunday April 1st 2012, and thus began the practice of releasing an April Fools Day comic on April 1st, notwithstanding [[#Release Weekday|what day of the week]] it fell on by shifting the comic's release to that day. Typically it would thus replace the next release day, so there would not be a comic on Monday the 2nd or 3rd of April, if April 1st fell in the weekend.

This worked for the next three years with [[1193: Externalities]] in 2013, [[1350: Lorenz]] in 2014 (first Tuesday release) and [[1506: xkcloud]] in 2015. But then the project became so complicated that in 2016, the release was delayed until [[1663: Garden#Monday 4th of April release|Monday April 4th]] with [[1663: Garden]].

The yearly trend thus continued until 2017, where no comics were released on April 1st. And the two comics around the date had nothing to do with such a joke. See more on this, and why this may have been the case, in the [[1818: Rayleigh Scattering#No April Fools' Day comic in 2017|trivia section]] of the first of these two, [[1818: Rayleigh Scattering]].

Then from 2018 Randall once again began releasing April Fools' Day comic. In 2018 he again moved the release day from Monday April 2nd to Sunday April 1st with [[1975: Right Click]]. In this comic he both links to [[404: Not Found]] and [[UniXKCD]] two of his previous "not a real comic" April Fools' Day jokes. In 2019 April 1st was a Monday so a normal release day, and he released [[2131: Emojidome]], another user generated comic.

In 2020 he again had trouble and the release of [[2288: Collector's Edition]] was delayed two days for a [[2288: Collector's Edition#Trivia|Friday April 3rd release]]. Instead the planned Friday comic [[2289: Scenario 4]] was released on Saturday.

In 2021 [[2445: Checkbox]] was released on Thursday April 1st, making it the first April Fools' Day comic to be released on a Thursday. Only Saturday has yet to see a special release. It could have happened either in 2017 or 2023, but those have been the so far only two years without such a comic since 2011.

In 2022 [[2601: Instructions]] was released on Friday April 1st, a normal release day. There was though an interesting fact related to this release. First of all it visually was similar to the previous Fools' comic, which had only a {{w|checkbox}} to begin with. Instructions only had a {{w|radio button}}. But more interesting, like last year, this comic had an audio part. Thus making it a recurring Fools' theme, and also making these two comics the, at that time, only [[:Category:Comics with audio|comics with audio]]. Although in Instructions the sounds was a vital part of the joke, which was not the case the year before. (Also both comics had a mute button, that could toggle the sound on and off. But the two comics similar buttons worked in reverse, so the mute button had muted sound in the first, but the audio on in the second of the two comics...)

In 2023 [[2757: Towed Message]] was released on Friday March 31st. The next comic, [[2758: My Favorite Things]], was released on the normal schedule on Monday April 3rd. The actual April Fools comic, [[2765: Escape Speed]], was delayed until April 19.

In 2024, [[2914: Eclipse Coolness]] appeared on April 1st without having any relation to April fools'. The release of [[2916: Machine]] (late) in the Friday 5th of April slot appears to be the year's April fools' comic. It is, however, the first time a release day has fallen on April 1st without Randall making any note of it. Not since 2009 has there been a comic released on April 1st without it being an April fools' comic. But that year he found another way to make an April fools', thus making this year the first ever that was actually released on April 1st without any April fools'.

[[Randall]] discusses several April fools' comics in his talk at [https://vimeo.com/78912850 Øredev 2013].

===Release Weekday===
*Here is a list of the day of the week the "real" April 1st comic was released.
**Those not on Monday, Wednesday and Friday, have been moved to hit April 1st.
***Example with the first to do so [[1037: Umwelt]].
***It was planned for release on Monday April 2nd but came out Sunday April 1st 2012.
***The next comic [[1038: Fountain]] skipped Monday and came out as normal Wednesday April 4th.

#2008 '''Tuesday''' April 1st:
#*[[404: Not Found]]
#*This was technically not a comic, but it did specifically "not come out" on April 1st.
#*But it DID not come out, between the normal Monday and Wednesday release making it "not" an extra comic that week.
#2011 Friday April 1st:
#*[[880: Headache]]
#2012 '''Sunday''' April 1st:
#*[[1037: Umwelt]]
#*The next release was not Monday but Wednesday, so it replaced the Monday release.
#2013 Monday April 1st:
#*[[1193: Externalities]]
#2014 '''Tuesday''' April 1st:
#*[[1350: Lorenz]]
#*This was the first Tuesday release, but the other two releases that week fell normally on Monday and Friday, thus it replaced Wednesdays release.
#2015 Wednesday April 1st:
#*[[1506: xkcloud]]
#2016 [[1663: Garden#Monday 4th of April release|Monday April 4th]]:
#*[[1663: Garden]]
#*This comic was supposed to be released Friday April 1st but had technical problems and ended up being released on Monday April 4th.
#*There where thus only two comics in the week before. See the link above.
#*There was [[1663: Garden#April Fool's comic|no doubt]] that this was supposed to be the April Fools' day comic.
#There was [[1818: Rayleigh Scattering#No April Fools' Day comic in 2017|No April Fools' Day comic]] in 2017.
#2018 '''Sunday''' April 1st:
#*[[1975: Right Click]]
#*The next release was not Monday but Wednesday, so it replaced the Monday release.
#2019 Monday April 1st:
#*[[2131: Emojidome]]
#2020 [[2288:_Collector's_Edition#Trivia|Friday April 3rd]]:
#*[[2288: Collector's Edition]]
#*This comic was supposed to be released Wednesday April 1st but had technical problems and ended up being released on Friday April 3rd.
#*The original planned Friday comic, [[2289: Scenario 4]], was then released on Saturday April 4th
#2021 '''Thursday''' April 1st:
#*[[2445: Checkbox]]
#*The next release was not Friday but Monday, so it replaced the Friday release.
#2022 '''Friday''' April 1st:
#*[[2601: Instructions]]
#2023 '''Wednesday''' April 19:
#*[[2765: Escape Speed]]
#There was no April fools' Day comic in 2024. Even though [[2914: Eclipse Coolness]] was released on Monday April 1st.

</div>
 

[[Category:Comics by date]]
[[Category:Comics from April]]
[[Category:Distinctive comics]]

April Fools' Day comics

2024-04-06T08:44:55Z

172.70.163.48: Assuming the prior edit is correct, no longer "two years in a row", though the missed/delayed release facts still apply to the date landing on a comic-day, apparently unmarked.

*Comics (or other happenings related to xkcd) that were put up on {{w|April Fools' Day}} as an April Fools' Day joke. They have been annual, having been featured every year since 2011, except for 2017, 2023 and 2024 (the first time this has been missing two years in a row).

*'''Click''' to expand for a more detailed explanation:
<div class="mw-collapsible mw-collapsed leftAlign" style="width:100%">
 

==Explanation==
In 2006, the first year that xkcd released in March and April, there was no comic released on April 1st and no April Fools' comic was released. The two comics before and after were [[83: Katamari]] from March 31st and [[84: National Language]] from April 3rd.

[[Randall]] first posted an April Fools' comic on Sunday, April 1, 2007. This comic ("[[Syndication]]") was not numbered; sequentially, it came between [[242: The Difference]] and [[243: Appropriate Term]]. It has not been preserved in the official xkcd archives.

For April Fools' Day 2008 [[Randall]] created [[404: Not Found]], which is a meta-comic, since it in fact doesn't exist. But that he considers it a comic is both made clear in the explanation for said "comic" and also since he links to it in his 2018 April fools' comic [[1975: Right Click]], from a fools' menu that links to all his comic alphabetically by title.

The comic for April 1st 2009 had no obvious ties to April Fools' Day, but on that day Randall made an April Fool in another way. See the [[563: Fermirotica#Trivia|Trivia section]] for [[563: Fermirotica]], released that day.

April 1st, 2010 didn't coincide with a comic release. However, on that day the site was altered to mimic a Unix command line interface, the so called [[UniXKCD]]. (This happened wile [[721: Flatland]] was the newest comic, but it was released March 31st and had nothing to do with April Fools' Day, see this [[721: Flatland#UniXKCD|trivia]]).

Starting on Friday, April 1st, 2011 with [[880: Headache]], [[Randall]] has released a real April Fools' Day joke annually, except 2017, 2023 and 2024.

Beginning with the second year in that row, with [[1037: Umwelt]], he moved the release day to Sunday April 1st 2012, and thus began the practice of releasing an April Fools Day comic on April 1st, notwithstanding [[#Release Weekday|what day of the week]] it fell on by shifting the comic's release to that day. Typically it would thus replace the next release day, so there would not be a comic on Monday the 2nd or 3rd of April, if April 1st fell in the weekend.

This worked for the next three years with [[1193: Externalities]] in 2013, [[1350: Lorenz]] in 2014 (first Tuesday release) and [[1506: xkcloud]] in 2015. But then the project became so complicated that in 2016, the release was delayed until [[1663: Garden#Monday 4th of April release|Monday April 4th]] with [[1663: Garden]].

The yearly trend thus continued until 2017, where no comics were released on April 1st. And the two comics around the date had nothing to do with such a joke. See more on this, and why this may have been the case, in the [[1818: Rayleigh Scattering#No April Fools' Day comic in 2017|trivia section]] of the first of these two, [[1818: Rayleigh Scattering]].

Then from 2018 Randall once again began releasing April Fools' Day comic. In 2018 he again moved the release day from Monday April 2nd to Sunday April 1st with [[1975: Right Click]]. In this comic he both links to [[404: Not Found]] and [[UniXKCD]] two of his previous "not a real comic" April Fools' Day jokes. In 2019 April 1st was a Monday so a normal release day, and he released [[2131: Emojidome]], another user generated comic.

In 2020 he again had trouble and the release of [[2288: Collector's Edition]] was delayed two days for a [[2288: Collector's Edition#Trivia|Friday April 3rd release]]. Instead the planned Friday comic [[2289: Scenario 4]] was released on Saturday.

In 2021 [[2445: Checkbox]] was released on Thursday April 1st, making it the first April Fools' Day comic to be released on a Thursday. Only Saturday has yet to see a special release. It could have happened either in 2017 or 2023, but those have been the so far only two years without such a comic since 2011.

In 2022 [[2601: Instructions]] was released on Friday April 1st, a normal release day. There was though an interesting fact related to this release. First of all it visually was similar to the previous Fools' comic, which had only a {{w|checkbox}} to begin with. Instructions only had a {{w|radio button}}. But more interesting, like last year, this comic had an audio part. Thus making it a recurring Fools' theme, and also making these two comics the, at that time, only [[:Category:Comics with audio|comics with audio]]. Although in Instructions the sounds was a vital part of the joke, which was not the case the year before. (Also both comics had a mute button, that could toggle the sound on and off. But the two comics similar buttons worked in reverse, so the mute button had muted sound in the first, but the audio on in the second of the two comics...)

In 2023 [[2757: Towed Message]] was released on Friday March 31st. The next comic, [[2758: My Favorite Things]], was released on the normal schedule on Monday April 3rd. The actual April Fools comic, [[2765: Escape Speed]], was delayed until April 19.

In 2024, [[2914: Eclipse Coolness]] appeared on April 1st without having any relation to April fools'. It is (as of 6/April) a year in which that Randall did not make an April fools' comic, which is a first since he began on 2011. It is also the first time a release day has fallen on April 1st without Randall making any note of it. Not since 2009 has there been a comic released on April 1st without it being an April fools' comic. But that year he found another way to make an April fools', thus making this year the first ever that was released on April 1st without any April fools'.

[[Randall]] discusses several April fools' comics in his talk at [https://vimeo.com/78912850 Øredev 2013].

===Release Weekday===
*Here is a list of the day of the week the "real" April 1st comic was released.
**Those not on Monday, Wednesday and Friday, have been moved to hit April 1st.
***Example with the first to do so [[1037: Umwelt]].
***It was planned for release on Monday April 2nd but came out Sunday April 1st 2012.
***The next comic [[1038: Fountain]] skipped Monday and came out as normal Wednesday April 4th.

#2008 '''Tuesday''' April 1st:
#*[[404: Not Found]]
#*This was technically not a comic, but it did specifically "not come out" on April 1st.
#*But it DID not come out, between the normal Monday and Wednesday release making it "not" an extra comic that week.
#2011 Friday April 1st:
#*[[880: Headache]]
#2012 '''Sunday''' April 1st:
#*[[1037: Umwelt]]
#*The next release was not Monday but Wednesday, so it replaced the Monday release.
#2013 Monday April 1st:
#*[[1193: Externalities]]
#2014 '''Tuesday''' April 1st:
#*[[1350: Lorenz]]
#*This was the first Tuesday release, but the other two releases that week fell normally on Monday and Friday, thus it replaced Wednesdays release.
#2015 Wednesday April 1st:
#*[[1506: xkcloud]]
#2016 [[1663: Garden#Monday 4th of April release|Monday April 4th]]:
#*[[1663: Garden]]
#*This comic was supposed to be released Friday April 1st but had technical problems and ended up being released on Monday April 4th.
#*There where thus only two comics in the week before. See the link above.
#*There was [[1663: Garden#April Fool's comic|no doubt]] that this was supposed to be the April Fools' day comic.
#There was [[1818: Rayleigh Scattering#No April Fools' Day comic in 2017|No April Fools' Day comic]] in 2017.
#2018 '''Sunday''' April 1st:
#*[[1975: Right Click]]
#*The next release was not Monday but Wednesday, so it replaced the Monday release.
#2019 Monday April 1st:
#*[[2131: Emojidome]]
#2020 [[2288:_Collector's_Edition#Trivia|Friday April 3rd]]:
#*[[2288: Collector's Edition]]
#*This comic was supposed to be released Wednesday April 1st but had technical problems and ended up being released on Friday April 3rd.
#*The original planned Friday comic, [[2289: Scenario 4]], was then released on Saturday April 4th
#2021 '''Thursday''' April 1st:
#*[[2445: Checkbox]]
#*The next release was not Friday but Monday, so it replaced the Friday release.
#2022 '''Friday''' April 1st:
#*[[2601: Instructions]]
#2023 '''Wednesday''' April 19:
#*[[2765: Escape Speed]]
#There was no April fools' Day comic in 2024. Even though [[2914: Eclipse Coolness]] was released on Monday April 1st.

</div>
 

[[Category:Comics by date]]
[[Category:Comics from April]]
[[Category:Distinctive comics]]

Talk:2915: Eclipse Clouds

2024-04-04T13:58:59Z

172.70.163.48:

I suspect Friday's and next Monday's comics will also be about the eclipse. We should be proactive and create a category for them. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 17:12, 3 April 2024 (UTC)
:Might explain why there was no time to fit in a decent AF comic. (And this one definitely reminds me of '99!) [[Special:Contributions/172.69.43.225|172.69.43.225]] 17:31, 3 April 2024 (UTC)

Nephele (νεφέλη) is Greek for cloud. [[Special:Contributions/172.71.123.81|172.71.123.81]] 17:14, 3 April 2024 (UTC)Ben
:I'm still trying to find a good way to word it, for those not already aware. (There are a number of related words, c.f. germanic "nebel", "nebulous" or of course "nephelococcygia"). [[Special:Contributions/172.69.43.225|172.69.43.225]] 17:31, 3 April 2024 (UTC)

I thought the joke in the title text is that a combined solar-lunar-nephelogical eclipse is impossible, not just "rare". You can't have a solar and lunar eclipse at the same time. Either of them can be nephelogical, though. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 17:16, 3 April 2024 (UTC)
:Triple-conjunctions (plus the 'viewpoint', to make it a four-body syzygy) are a thing, though. A rare thing. And not to be confused with the standard meaning of {{w|triple conjunction}}, but I'm not sure what else to call it (when not just a sequence across time). [[Special:Contributions/172.69.43.225|172.69.43.225]] 17:31, 3 April 2024 (UTC)
:no the clouds are occluding the moon and the moon is occluding the sun so it is a lunar eclipse. Not a nephelogical eclipse though because the clouds aren’t occluded
::They are if you close your eyes.[[Special:Contributions/172.69.43.242|172.69.43.242]] 08:28, 4 April 2024 (UTC)

We dont already have a catagory for eclipses?? I'd have thought someone would have made one last eclipse, since there was so many comics about them [[User:Apollo11|Apollo11]] ([[User talk:Apollo11|talk]]) 17:24, 3 April 2024 (UTC)
:Someone has just been adding the (currently redlinked) [[:Category:Solar eclipses]]. Which is admirable, but perhaps better to have established the actual Category first. (I would have suggested "Eclipses" be created. Or at least that as a super-category for the separate Solar and Lunar cats, plus any further eclipses that individually might be mentioned.) [[Special:Contributions/172.70.90.190|172.70.90.190]] 17:41, 3 April 2024 (UTC)
:I created the category page. I wasn't sure what should go on it, so other people could review it [[User:Firestar233|guess who]] ([[User talk:Firestar233|if you want to]] | [[Special:Contributions/Firestar233|what i have done]]) 23:50, 3 April 2024 (UTC)

Oddly enough, clouds tend to disappear during eclipses. Strange, but true. [[Special:Contributions/172.70.39.72|172.70.39.72]] 20:03, 3 April 2024 (UTC)
:Maybe they're there, but you can't see them because it's dark :) [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 00:55, 4 April 2024 (UTC)
::Clouds typically form because warm air rises, cools off in the higher layers and water vapor then condenses. During an eclipse, the Sun no longer heats the ground, temperature drops a bit, and thus the cloud forming mechanism is interrupted. This means that there will indeed be somewhat fewer/less dense clouds during an eclipse. It is definitely not enough to get rid of all possible clouds, but I have seen a lightly overcast sky clear up when the totality approached. [[Special:Contributions/172.71.182.142|172.71.182.142]] 06:41, 4 April 2024 (UTC)
:::I've seen lightly overcast skies clear up when there wasn't an eclipse, though - how do you explain that?[[Special:Contributions/172.70.162.38|172.70.162.38]] 08:31, 4 April 2024 (UTC)
::::Clearly that was just an eclipse you couldn't see! Checkmate! [[Special:Contributions/172.70.163.48|172.70.163.48]] 13:58, 4 April 2024 (UTC)

Nobody has mentioned that Eclipse coolness tends to a Dirac delta function. I fear this site is dumbing down. [[Special:Contributions/172.70.86.50|172.70.86.50]] 12:39, 4 April 2024 (UTC)

2915: Eclipse Clouds

2024-04-03T17:55:09Z

172.70.163.48: /* Explanation */ on-screen keyboard, again. "L"<=>Backspace, space<=>"C". Oh how I wish it was haptic..!

{{comic
| number = 2915
| date = April 3, 2024
| title = Eclipse Clouds
| image = eclipse_clouds_2x.png
| imagesize = 526x251px
| noexpand = true
| titletext = The rare compound solar-lunar-nephelogical eclipse
}}

==Explanation==
{{incomplete|Created by a SOMETHING OBSCURED BY CLOUDS - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

Following on from [[2914: Eclipse Coolness]], Randall is anticipating the solar eclipse that will be (hopefully) visible in the United States on the upcoming Monday.

In that comic, he mostly deals with the issues of geography: that not having the foresight to actually be in a good location will make the eclipse less than spectacular. In this comic, he establishes the possible effects of the weather, which is a far more uncertain element in the lead up to the day (or even upon the day itself), regardless of how much careful planning one might have conducted in advance. At the time that this comic was posted, many of the weather forcasts predicted overcast skies. This is extremely dissapointing to anyone wishing to watch the Moon slowly block out the Sun.

The off-panel voice points out that [[Cueball]] wanted to see something block out the Sun, so this technecally fits his wish. However the goal is to see the Moon fully obscure the Sun, as seen from the Earth. What is ''not'' wanted is for a cloud to obscure (the Moon obscuring) the Sun. There are web sites that provide weather forecasts for any given location, and these can be used for those places where the eclipse ought to be visible, to help eclipse chasers/waiters plan the best place to have headed to in order to view it.

The title-text references the 'alignment' of Sun, Moon ''and'' cloud, describing it as rare, although this is not really as desirable as it might make it sound. Sun/Moon conjunctions are already quite rare, so that the balance against Sun/Moon/no-cloud probabilities isn't really so notable, essentially being the general difference between cloud and no-cloud on any average day for your chosen location.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[Cueball sits on an ergonomic office chair at a desk, typing at his computer.]
:Cueball: These eclipse weather forecasts are killing me.
:Laptop: ''refresh''

:[Cueball remains at his desk. An off-panel voice speaks.]
:Off-panel voice: So you really want to see something block out the sun...

:Off-panel voice: ...But not a cloud. It has to be the Moon specifically.
:Cueball: '''''My tastes are very singular!'''''

{{comic discussion}}

[[Category:Solar eclipses]]