explain xkcd - User contributions [en]

User:ColorfulGalaxy

2023-02-28T08:09:12Z

172.70.214.253:

<table class="infobox vcard">
<tr><th colspan=2 class="fn" style="text-align:center; font-size:125%; font-weight:bold; background-color:#BCD4E6;">ColorfulGalaxy</th></tr>
<tr><td colspan="2" class="{{{class|}}}" style="text-align:center; {{{headerstyle|}}}">[[File:ColorfulGalaxy.png|150px|alt=text]]
<div><center>ColorfulGalaxy</center></div></td></tr>
<tr class="{{{rowclass|}}}">
<th scope="row" style="text-align:left; line-height: 1.3em;">Born</th>
<td class="{{{class|}}}" style="line-height: 1.3em;">Unknown</td></tr>
<tr class="{{{rowclass|}}}">
<th scope="row" style="text-align:left; line-height: 1.3em;">Residence</th>
<td class="{{{class|}}}" style="line-height: 1.3em;">Unknown</td></tr>
<tr class="{{{rowclass|}}}">
<th scope="row" style="text-align:left; line-height: 1.3em;">Nationality</th>
<td class="{{{class|}}}" style="line-height: 1.3em;">Unknown</td></tr>
<tr class="{{{rowclass|}}}">
<th scope="row" style="text-align:left; line-height: 1.3em;">Language</th>
<td class="{{{class|}}}" style="line-height: 1.3em;">English and some other languages[[[285|citation needed]]]</td></tr>
<tr class="{{{rowclass|}}}">
<th scope="row" style="text-align:left; line-height: 1.3em;">Institutions</th>
<td class="{{{class|}}}" style="line-height: 1.3em;">Unknown</td></tr>
<tr class="{{{rowclass|}}}">
<th scope="row" style="text-align:left; line-height: 1.3em;">Alma mater</th>
<td class="{{{class|}}}" style="line-height: 1.3em;">Unknown</td></tr></table>

'''ColorfulGalaxy''' is a user on the wiki.

{{notice|'''This explanation may be incomplete or incorrect:''' ''The infobox is broken'' If you can address this issue, please '''[{{fullurl:{{{target|{{FULLPAGENAME}}}}}|action=edit}} edit the page]!''' Thanks.
}}

==Contact him==
If you have suggestions on his articles or spot a mistake, you may [http://www.conwaylife.com/forums/ucp.php?i=pm&mode=compose&u=2640 contact him] at the LifeWiki forums or comment at [[User_talk:ColorfulGalaxy|his talk]] page.

==See also==

; List of Gallifreyan Alternative Alphabets

* [[User:ColorfulGalaxy/Gallifreyan/SCG|Sherman's]]
* [[User:ColorfulGalaxy/Gallifreyan/DCG|Doctor's Cot]]
* [[User:ColorfulGalaxy/Gallifreyan/RSG|Rasilonian]]
* [[User:ColorfulGalaxy/Gallifreyan/TCG|TARDIS Console]]
* [[User:ColorfulGalaxy/Gallifreyan/Flux|Flux]]
* [[User:ColorfulGalaxy/Gallifreyan/CWG|Clockwork]]
* [[User:ColorfulGalaxy/Gallifreyan/GCG|GC Gallifreyan]]
* [[User:ColorfulGalaxy/Gallifreyan/CBG|cBettenbender's]]
* [[User:ColorfulGalaxy/Gallifreyan/CCG|CC Gallifreyan]]
* [[User:ColorfulGalaxy/Gallifreyan/TKG|Timekeepers]]

; Neography pages

* [[User:ConscriptGuide/Baal|Baal]]
* [[User:ConscriptGuide/Block_Script|Block Script]]
* [[User:ConscriptGuide/Brittish|Brittish]]
* [[User:ConscriptGuide/Chartograph|Chartograph]]
* [[User:ConscriptGuide/Exprish|Exprish]]
* [[User:ConscriptGuide/Gernreich|Gernreich]]
* [[User:ConscriptGuide/Graph_Script|Graph Script]]
* [[User:ConscriptGuide/Knot|Knot Alphabet]]
* [[User:ConscriptGuide/MSA|Minimal Stacking]]
* [[User:ConscriptGuide/Nail_Script|Nail Script]]
* [[User:ConscriptGuide/Ogham_for_English|Ogham]]
* [[User:ConscriptGuide/Pattern_Script|Pattern Script]]
* [[User:ConscriptGuide/Timescript|Timescript]]
* [[User:ConscriptGuide/Uriovakiro|Uriovakiro]]
* [[User:ConscriptGuide/Xelbet|Xelbet]]

; Symbolic Ciphers

* [[User:CipherGuide/Bokscript|Boksript]]
* [[User:CipherGuide/Code_Script|Code Script]]
* [[User:CipherGuide/Tano|Tano]]

; Neography Showcasing pages

* [[User:ConscriptGallery/tagline|XKCD Logo and Tagline in various neography scripts]]
* [[User:ConscriptGallery/Google|Google logo in various scripts]]
* [[User:ConscriptGallery/Usernames|Usernames]]

; Miscellaneous pages

* [[User:ColorfulGalaxy/Cryptic|Cryptic]]

==External Links==
* [http://conwaylife.com/wiki/User:ColorfulGalaxy ColorfulGalaxy] at the LifeWiki
* [http://www.conwaylife.com/forums/ucp.php?i=pm&mode=compose&u=2640 Contact this user] at the LifeWiki forums

2733: Size Comparisons

2023-02-04T03:38:17Z

172.70.214.253: /* Explanation */ largest in contiguous us

{{comic
| number = 2733
| date = February 3, 2023
| title = Size Comparisons
| image = size_comparisons_2x.png
| imagesize = 238x373px
| noexpand = true
| titletext = If you shrank the Solar System to the size of Texas, the Houston metro area would be smaller than a grasshopper in Dallas.
}}

==Explanation==
{{incomplete|Created by a TEXAS-SIZED CRICKET - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

Cueball attempts to emphasize Texas' size (as the largest state in the contiguous US) to Ponytail by making a size comparison. He states that if Texas was expanded to the size of the solar system, the ants in Texas will be as large as Rhode Island. However, Cueball on purpose (According to the caption) proves how small Texas actually is compared to the Solar system (which is a lot larger).

There are a lot of definitions for how large the Solar System is, but the most common of which is Neptune's Aphelion (Farthest point from Sun). Using the circle area equation, we find the "area" of the solar system to be 6.49E19 (a lot) kilometers squared. Texas's area is 696,241, if we then divide, we get 9.32E13(still a lot though). Ants, unfortunately for the calculations, vary vastly in their size. Rhode island's area is 3,144 kilometers squared. we can therefore get that Randall's average "ant" is 33.73 square millimeters large. Unscientifically measured, an ant has an "aspect ratio" of 1:2, which will result in a length of 8.21mm, which falls into the range of 2mm~25mm. Therefore, Randall's calculations are correct.

The title text refers to the opposite, where the entire Solar system is being scaled down to the size of Texas, the Houston (a city in Texas) metro area (a bit larger than Houston's area) would be smaller than a grasshopper in Dallas (another city in Texas). We can reuse the 9.32E13 multiplier, this time with the Houston metro area's area (26,061 kilometers squared), and receive 279.6 millimeters squared, a grasshopper is thinner than an ant, so we use the aspect ratio of 1:3 instead, getting an answer of 28.96 mm, or almost 3 centimeters, this falls on the slightly shorter side of the 1~7 cm range and is definitely smaller than a lot of grasshoppers.

A common trope in explaining the sizes of unfamiliar things is to compare the thing to something people are likely to know. For instance, a human-sized flea could jump over the Eiffel tower, if jumping distance scaled with animal size (It doesn't). In this case, Randall is comparing objects that are extremely different in scale (the state of Texas and a small insect), but then blowing Texas up to yet another size that's many orders of magnitude larger, with the result that the comparison is of no value in understanding how big Texas is (which was supposed to be the point). The only message you get in the end is, "Texas is much bigger than an ant." Most people knew that.

This is another in the series of [[My Hobby|Randall's Hobbies]].

==Transcript==

:[Cueball speaking to Ponytail.]
:Cueball: Texas is so big that if you expanded it to the size of the Solar System, the ants there would be as big as Rhode Island.
:Ponytail: Wow!
:Ponytail: ...Wait.

:[Caption below panel]
:My hobby: Unhelpful size comparisons

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Ponytail]]
[[Category:My Hobby]]

2659: Unreliable Connection

2023-01-21T07:34:35Z

172.70.214.253: Replaced content with "Are you into YouTube ? Believe me or Not, Video Marketing is the NEXT Biggest Thing on 2023. If Yes, you might save your previous Time & 2X 3X your Productivity with the..."

Are you into YouTube ?

Believe me or Not, Video Marketing is the NEXT Biggest Thing on 2023.

If Yes, you might save your previous Time & 2X 3X your Productivity with these Tools.

Text to Audio Convertor: https://www.xoxourl.com/speechelo
Rank Videos in 60 Seconds: https://www.xoxourl.com/vidly
Eye CATCHING Thumbnail in minutes: https://www.xoxourl.com/thumbnail
Video Onpage Optimization for #1 Ranking : https://www.xoxourl.com/vmblaster

Cheers.

2718: New Year's Eve Party

2023-01-02T12:27:45Z

172.70.214.253: /* Explanation */ ophthalmologist

{{comic
| number = 2718
| date = December 30, 2022
| title = New Year's Eve 2023
| image = new_years_eve_2023_2x.png
| imagesize = 306x274px
| noexpand = true
| titletext = [Earlier, at the eye doctor] 'No, for the last time, the numerals on the paper aren't my prescription, it's the shape I want you to make with the laser.'
}}

==Explanation==
{{incomplete|Created by a "2023" LASER EYE SURGEON. Do NOT delete this tag too soon.}}

{{w|New Year's glasses}} are novelty eyeglasses typically worn at New Year's Eve parties, shaped like the digits of the upcoming year. They were popularized in the late 1990s and early 2000s since the middle digits (9 and 0) had holes large enough to look through or mount lenses into.

[[Ponytail]], [[White Hat]], [[Megan]] and [[Cueball]] are at a party. The first three are wearing such glasses in the shape of the numerals "2023", representing the upcoming New Year. Cueball has chosen to obtain cosmetic {{w|laser eye surgery}} instead. Usually, such procedures are intended to adjust a patient's corneas to correct vision problems, as an alternative to glasses and contact lenses. Cueball has apparently had the digits 2023 etched into his eyes as an alternative to wearing novelty glasses. While {{w|scleral tattooing}} is performed for cosmetic reasons, and {{w|corneal tattooing}} for both cosmetic and vision benefits, the efficacy and safety of either process is not universally accepted. The procedure has damaged Cueball's vision so much that he mistakes a newcomer to the party resembling [[Hairy]] as [[Rob]]. Realizing he made a mistake, his second guess is that the new arrival is named Mike.

In the title text, an earlier conversation with his {{w|ophthalmologist}} has established Cueball's problems are due to the laser burning the digits straight onto his eyeballs, without regard to his eye safety. Most previous depictions of Cueball have not shown him wearing glasses. Laser eye surgery was referenced along with other laser equipment in [[1681: Laser Products]].

{{notice2|The Mountain View, California Public Library is hosting an online chat with [[Randall Munroe]] Tuesday, January 31 at 11am Pacific. [https://libraryc.org/mountainviewlibrary/22032 Register here to send your question(s) to the moderators.]|image=Crystal Project Agt announcements.png}} 

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Ponytail, White Hat, Megan, Cueball, and Hairy are standing around. Ponytail, White Hat, and Megan are wearing glasses in the shape of the number 2023 and holding party-related items. Hairy is on the other side of Cueball from them and is only carrying some item of clothing, probably a recently removed coat. Cueball carries nothing, and his attention is on the new arrival, possibly having to squint at him, as depicted by a set of short radial lines projecting away from where Cueball's eyes would be if they were ever drawn.]
:Cueball: Hey Rob! Or, uh...
:Cueball: Sorry, is that Mike?

:[Caption below the panel]:
:I'm regretting my New Year's Eve novelty "2023" laser eye surgery.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring White Hat]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Hairy]]
[[Category:Medicine]]
[[Category:New Year]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring White Hat]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]

Talk:2716: Game Night Ordering

2022-12-27T02:28:13Z

172.70.214.253: Reply

Should we create a category for comics about game night? It can contain at least this and https://xkcd.com/2486/. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 22:32, 26 December 2022 (UTC)
:I'm not going to oppose it, but keep in mind that it would overlap with [[:Category:Board games]]. --[[Special:Contributions/172.70.178.48|172.70.178.48]] 22:50, 26 December 2022 (UTC)
::We absolutely need a general [[:Category:Games]] because we have e.g. roleplaying games under Board games. Does anyone know how to edit in a superclass category? The last time I ever did anything sophisticated with Mediawiki categories was like 2008. [[Special:Contributions/172.71.154.38|172.71.154.38]] 23:39, 26 December 2022 (UTC)

The rules would seem to be similar to the card game Cheat (or, at least, the version we used to play). Using an ordinary wholly-dealt pack of cards (for any number of players), it was a "blind bid and discard" game whereby each player has to state "<one to four> <card value>s" (or more than four, with merged packs, each of which might be whole or partial) was going on the discard pile, such that the card value was within one (-1, =, +1, with standard wrapping ...>10>J>Q>K>A>2>...) of the prior stated discard. And ''something'' had to be discarded, whether or not the player could technically do so. The forfeit for not continuing play ''or'' challenging, within a generally acceptable thinking time, was the same for either being successfully challenged (you stated you put down two threes, but on checking the dump pile you discarded two sevens) or for the person who wrongly challenged... to pick up the discard pile and be so much further from the ultimate goal of ending up with zero cards (the first the winner, optionally the second, third, etc to do so to earn further ranks just for the sake of continuing/last-ranking the one who ended up as the only one still with cards). - I presume this game just applies the same penalty (buying the food) to anyone who dithers over whether to challenge anything or 'play their own hand'. There doesn't need to be anything more complicated to it. Unless there's also an 'empty hand' winning state, that I can't discern from the brief discourse given in the comic. But it seems more geared to finding the eventual 'loser' (the one who pays up) than any single beneficiary. [[Special:Contributions/162.158.34.230|162.158.34.230]] 23:17, 26 December 2022 (UTC)
:If there is a link for Cheat you should add it. [[Special:Contributions/172.70.206.150|172.70.206.150]] 23:20, 26 December 2022 (UTC)
::Well, I think there's far too many variations... Though, surprisingly, it does look like {{w|Cheat (game)}} actually describes ''my'' learnt version quite well. But I don't think I see any 'time out' penalties mentioned there, and that was the key part of the "play or challenge, don't dither, or you lose" bit to my (sorry, rather long) description above... [[Special:Contributions/162.158.34.230|162.158.34.230]] 23:27, 26 December 2022 (UTC)
::: Never apologize for verbosity on talk; devote that energy to brevity on main. [[Special:Contributions/172.71.154.156|172.71.154.156]] 23:41, 26 December 2022 (UTC)
::::We need a quotes page. [[Special:Contributions/172.70.206.150|172.70.206.150]] 02:13, 27 December 2022 (UTC)
::(Plus there's the inverted "loser finder" rather than "winner finder" primary nature of the gameplay. It makes the methodology of play a bit too different.) [[Special:Contributions/162.158.34.231|162.158.34.231]] 23:30, 26 December 2022 (UTC)

We should make a payment service for providing crowdfunded rewards to the best contributors to explanations. [[Special:Contributions/172.69.134.16|172.69.134.16]] 01:16, 27 December 2022 (UTC)
:I love this idea but it would conflict with the ethos of completely anonymized contributions here. Unless someone can propose how it might not? I mean, if there was some way to include an SHA-256 identity-confirming hash in edit summaries? Would keeping track of them in terms of surviving text after, say, a month be a decent leaderboard scoring? [[Special:Contributions/172.69.33.84|172.69.33.84]] 01:42, 27 December 2022 (UTC)
::My meager anonymous IP contributions to explanations have been completely dwarfed by my attempts to revert vandalism on the official main page leaderboard, but is that a good or a bad thing? The idea needs to be carefully considered. I would absolutely kick in $25 to support other explainers, but I would need some assurance that the system couldn't be gamed by, e.g. paraphrasers, which I'm not sure is even possible. [[User:Liv2splain|Liv2splain]] ([[User talk:Liv2splain|talk]]) 01:54, 27 December 2022 (UTC)
::: It's easy to hijack someone else's contributions with paraphrasing and refactoring. It's a dead end. [[Special:Contributions/162.158.166.230|162.158.166.230]] 02:05, 27 December 2022 (UTC)
:::: True, but is there a way to avoid the cheating? [[Special:Contributions/172.70.214.253|172.70.214.253]] 02:28, 27 December 2022 (UTC)

2716: Game Night Ordering

2022-12-26T23:15:49Z

172.70.214.253: /* Explanation */ nit picked

{{comic
| number = 2716
| date = December 26, 2022
| title = Game Night Ordering
| image = game_night_ordering_2x.png
| imagesize = 293x471px
| noexpand = true
| titletext = One good trick, if you get called on a fake service, is to build a working version of it and mention it again the next week.
}}

==Explanation==
{{incomplete|Created by a BORED FOOD.NET DRIVER BETWEEN DELIVERIES. Do NOT delete this tag too soon.}}

This comic is poking fun at the proliferation of apps and internet services such as for [https://builtin.com/consumer-tech/food-delivery-companies food delivery] and [https://www.nerdwallet.com/article/banking/best-ways-to-send-money money transfer]. The characters are discussing which to use during an evening of tabletop gaming. The group has a running competition to see who can mention the most fake apps and services without being called out.

[[Cueball]] mentions three food delivery services, {{w|Grubhub}}, {{w|DoorDash}}, and Food.net, and [[Ponytail]] asks him to reimburse her using {{w|Venmo}}, {{w|PayPal}}, or Yahoo Cash. Cueball expresses skepticism about Yahoo Cash, after which Ponytail admits it's a fake service and is thus obligated to pay for Cueball's meal. Food.net, which Cueball mentioned, is not a real service; https://food.net exists but is "not available for use," and is not related to food. Thus he was able to get a fake service past the other players. Based on Ponytail's offer, if someone is correctly called out then they apparently must pay for the player who caught them, but what happens when a player isn't caught (e.g. when Cueball mentioned Food.net) remains unknown.

The title text offers a tip for winning the competition after being called out for mentioning a fake service: building a working version of it and then mentioning it again the next week.

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

:[Cueball, Megan, and Ponytail are sitting at a table to order food. Cueball is on his phone, and Ponytail, sitting opposite, on her laptop.]
:Cueball: What should we use to order? Grubhub? DoorDash? Food.net?
:Ponytail: I'll do Grubhub; you can send me money. Do you do Venmo? Paypal? Yahoo Cash?
:Cueball: Yahoo Cash HAS to be fake.
:Ponytail: Yes. Dang. I'll get your share.
:[Caption below the panel:]
:Our game night has an ongoing competition to see who can mention the most fake apps and services without getting called on it.

{{comic discussion}}

2708: Mystery Asterisk Destination

2022-12-07T20:38:51Z

172.70.214.253: /* Explanation */ .

{{comic
| number = 2708
| date = December 7, 2022
| title = Mystery Asterisk Destination
| image = mystery_asterisk_destination_2x.png
| imagesize = 288x248px
| noexpand = true
| titletext = If you ever see the † dagger symbol with no unmatched footnote, it means the writer is saying the phrase while threatening you with a dagger.
}}

==Explanation==
{{incomplete|Created by a BOT.* Do NOT delete this tag too soon.}}

This comic is a reference to the use of asterisks and other symbols for footnotes or endnotes. It is a humorous way of indicating that when an asterisk appears in a piece of text without a corresponding footnote, it is pointing to this comic. This offers closure for missing footnotes (similarly to [[391: Anti-Mindvirus]]), perhaps to make up for the unmatched parenthesis [[Randall]] willingly set loose onto the world eleven years ago in [[859: (]].

The title text reveals that unmatched instances of † (a dagger; a symbol for a secondary footnote) are threats being made by the author to the reader with a physical dagger.

The title text, as of this writing, says "If you ever see the † dagger symbol with no '''''un'''''matched footnote[...]", forming a double negative. This is probably a typo.

==Transcript==
:[A blank panel with some text at the bottom.]
:'''*'''Whenever you see a mystery asterisk that doesn't have a matching footnote, it points here.

{{comic discussion}}

Talk:2707: Astronomy Numbers

2022-12-06T04:03:18Z

172.70.214.253: permalink

First time I've ever seen a completely blank page. [[User:IJustWantToEditStuff|IJustWantToEditStuff]] ([[User talk:IJustWantToEditStuff|talk]]) 20:27, 5 December 2022 (UTC)
:Everyone's enthralled by ChatGPT. [[Special:Contributions/172.69.22.35|172.69.22.35]] 04:01, 6 December 2022 (UTC)

It's also notable that something weighting 12 solar masses will collapse into black hole on it's own, unless it resist collapse through thermal pressure like stars. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 21:26, 5 December 2022 (UTC)

The Earth moves relative to the sun at 66,000 MPH. In what frame of reference is it 65 MPH? It isn't like Randall to get a number wrong. Maybe the magnitude of the distance from Earth to Sun changes at a closer rate, but even this is nearly 180 MPH if I'm calculating correctly. [[User:Mannerisky|Mannerisky]] ([[User talk:Mannerisky|talk]]) 21:37, 5 December 2022 (UTC)
: You're thinking orbital speed, she's talking orbital oscillation. That is, the speed at which the distance between earth and sun changes. [[Special:Contributions/198.41.242.240|198.41.242.240]] 21:51, 5 December 2022 (UTC) ADDITION: Orbital oscillation has both a mean/average factor and a current factor (which is at it slowest while at the apsides, and given the context the one being calculated) [[Special:Contributions/198.41.242.85|198.41.242.85]] 22:46, 5 December 2022 (UTC)

I get the sense that the thing that they're planning for January 1st is a precisely-timed new year's party and nothing to do with space exploration. {{unsigned|172.71.242.156}}

; Obligatory ChatGPT explanation

:'''Me:''' The following is a transcript from the latest xkcd comic. Please write an explanation of the comic: ''[transcript copied verbatim from [https://www.explainxkcd.com/wiki/index.php?title=2707:_Astronomy_Numbers&oldid=300614#Transcript its current state] omitted]''

:'''ChatGPT:''' In the xkcd comic, Ponytail and Cueball are discussing Earth's orbit around the sun. Ponytail notes that Earth will be approaching the sun at a rate of 65 miles per hour on January 1st. Cueball responds, "Weird?" Ponytail explains that they usually see only complex and incomprehensible numbers in astronomy, and seeing a "normal" number like 65 miles per hour feels wrong to them. This reflects the common perception that numbers in the sciences, especially astronomy, are often complex and difficult to understand. Earlier in the comic, Ponytail also expresses skepticism at a "normal" number when Megan in coat tells them that their cat weighs 12 lbs. Ponytail suggests that it must actually weigh either 10-20 or 1040 instead. Megan responds by saying that the cat's weight is actually 3x10-30 solar masses, which Ponytail finds more acceptable.

Meh. I wish superscipts would survive copy-paste. [[Special:Contributions/172.71.154.39|172.71.154.39]] 03:55, 6 December 2022 (UTC)

Talk:2701: Change in Slope

2022-11-26T02:02:28Z

172.70.214.253: /* Raw Data */ reword

I am an occasional data scientist, and I can confirm this is why we have monitor stands that tilt. [[Special:Contributions/172.71.94.50|172.71.94.50]] 16:33, 21 November 2022 (UTC)

The third e in "neeed" in the title text seems to be a typo
[[User:Victor|Victor]] ([[User talk:Victor|talk]]) 16:41, 21 November 2022 (UTC)
:I think Randall may have added it to represent that the speaker prolongs the "e" sound for emphasis, although that's usually done with 4-5 e's. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:53, 21 November 2022 (UTC)
::I had to double-check this, myself (presumed the 'Bot created the lage faithfully, but went straight to source to see if I needed to find a vandalism post to revert). May need a comment (to prevent hypercorrection, if not to note the implied emphisis) and certainly will if it turns out to be a typo and gets corrected (for which I'm sure a future checker will discover Randall's revisiting, but then worth a note to that effect). [[Special:Contributions/172.70.90.2|172.70.90.2]] 17:42, 21 November 2022 (UTC)
:::I guess Randall fixed it, because I'm only seeing 2 'e's in the title text. Just updated it on the wiki. [[User:Zman350x|Zman350x]] ([[User talk:Zman350x|talk]]) 01:26, 22 November 2022 (UTC)
Bender Bot was one of the main characters in Futurama. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:54, 21 November 2022 (UTC)
:Just donning my unnecessary pedantry hat for a moment: his name is Bender Bending Rodriguez --[[User:192·168·0·1|192·168·0·1]] ([[User talk:192·168·0·1|talk]]) 23:02, 21 November 2022 (UTC)

A couple(?) of authors used the word(s) "(point of) inflection", which is {{w|Inflection point|not really suitable}} for a join between two straight segments. Was tempted to talk about "discontinuity", but that really only applies to the meta-slope (derivatives, to one degree or other) where it suddenly jumps (at a point), or the derivative's derivative has jumps (as it enters and leaves the smoothly linking curve). Hope it works well enough how I left it, though. [[Special:Contributions/162.158.142.176|162.158.142.176]] 21:28, 21 November 2022 (UTC)

For anyone curious, I used an image editor to turn the entire comic sideways and [https://cdn.discordapp.com/attachments/525939879805190154/1044395695525875712/xkcd_sideways.png it actually does seem to work,] to some degree anyway. [[User:SuperSupermario24|SSM24]] 23:37, 21 November 2022 (UTC)
:Added; thanks! [[Special:Contributions/172.71.158.230|172.71.158.230]] 00:14, 22 November 2022 (UTC)

: If you don't mind sharing: which program did you use? Did you tweak things like relative distance / camera FOV, to effectively select a specific point in the continuum that makes up the {{w|Dolly Zoom}} effect, and at the limit on one end results in {{w|orthographic projection}}? (Edit 10 minutes later: a better article to look at is {{w|Perspective distortion (photography)}}) Or did you just leave it at whatever the default is? Can you recreate the image with the two extremes, and share them? And lastly - can you upload the image (and potentially the new images) to the wiki directly, so they can be embedded in the page? Thanks! --[[User:NeatNit|NeatNit]] ([[User talk:NeatNit|talk]]) 17:21, 22 November 2022 (UTC)

This one shows the beauty of Explainxkcd: people reading the explanation are likely to learn accessible methods of substantial practical utility. [[Special:Contributions/162.158.166.173|162.158.166.173]] 00:38, 22 November 2022 (UTC)

Hey, if it works for picking out lumber at Lowe’s, why not for graphs, too? - MadMarie
:There was an old bit of explanation that related it to examining physical objects (for dent/bend-removal in metalwork, I think it was) that got wiped out by a later edit. Though I'm considering my own version, now generalised to cover your experience, as it seems quite relevant/analogous to me. [[Special:Contributions/172.70.90.2|172.70.90.2]] 14:37, 22 November 2022 (UTC)

Whoever wrote the 1st explanation needs to go touch grass and learn how real people talk, pissed me off so much I just effectively rewrote the whole thing from scratch [[Special:Contributions/172.71.202.46|172.71.202.46]] 06:34, 22 November 2022 (UTC)
:Intrigued, looking at the first explanation (give or take that person's initial small errors/omissions) I personally find it more to the point than what it has become. Not to say the complete rewrite was wrong, but it got it not that much closer to the mythical perfection. IMO. [[Special:Contributions/141.101.76.169|141.101.76.169]] 20:29, 22 November 2022 (UTC)

Going in a different direction than "this is silly" - if we ignore the "viewing point/parallax" issue, doing a change of basis like this is similar to linear methods like [SVD https://hadrienj.github.io/assets/images/ch12_svd/ch11_SVD_geometry.png] & [https://jakevdp.github.io/PythonDataScienceHandbook/figures/05.09-PCA-rotation.png PCA], and considering the graph as a mappingg in a "higher dimension" is similar to the "kernel trick" popularized by [https://i.ytimg.com/vi/wqSTBCguVyU/maxresdefault.jpg Support] [https://miro.medium.com/max/4800/1*gtF6KeL7b9zNHd7pXtC1Nw.png Vector] [https://dinhanhthi.com/img/post/ML/support-vector-machine/svm-3.jpg Machines] 11:31, 22 November 2022 (UTC)

== Raw Data ==

I love this cartoon. This is definitely something that was relevant in my work!

At my old job I had some commercial or public-domain software for extracting the raw data behind a scatter plot. If anyone has something like that handy, I would love to see someone extract the data behind the graph on the left, so that we can:
1. Apply the affine transformation which generates the image on the right with the tilted paper.
2. Apply the statistical tests which Randall Munroe is alluding to.

:Knock yourself out:
{{cot|Digitized data courtesy https://apps.automeris.io/wpd/}}
<pre>
0.000000, 0.015366
0.001887, 0.000000
0.002830, 0.041488
0.024528, 0.060695
0.033019, 0.014597
0.038679, 0.009988
0.044340, 0.072220
0.047170, 0.055317
0.050000, 0.072220
0.064858, 0.092964
0.070215, 0.117001
0.088207, 0.088354
0.091037, 0.122928
0.091037, 0.109099
0.100943, 0.140215
0.103773, 0.165338
0.106603, 0.178246
0.128891, 0.171331
0.147641, 0.196685
0.146226, 0.187465
0.162264, 0.215124
0.180188, 0.264910
0.182452, 0.218812
0.202830, 0.275052
0.204245, 0.261222
0.208490, 0.272747
0.217923, 0.293491
0.227358, 0.267369
0.230322, 0.234880
0.241744, 0.311930
0.256603, 0.344199
0.262263, 0.338930
0.299056, 0.376467
0.308254, 0.420261
0.313206, 0.417956
0.336791, 0.456371
0.344338, 0.433322
0.355659, 0.456371
0.367923, 0.496323
0.374055, 0.503237
0.388206, 0.503237
0.389621, 0.514762
0.409433, 0.533201
0.412263, 0.525518
0.415093, 0.540884
0.432074, 0.555328
0.446225, 0.599275
0.443395, 0.588519
0.449526, 0.537811
0.449055, 0.588519
0.468866, 0.609263
0.487263, 0.627702
0.490093, 0.636922
0.516979, 0.670727
0.523448, 0.697179
0.519809, 0.662276
0.548111, 0.697618
0.551413, 0.740642
0.550941, 0.689935
0.565092, 0.726813
0.572168, 0.724508
0.576413, 0.772911
0.582073, 0.772911
0.582073, 0.763691
0.601177, 0.785588
0.604714, 0.791350
0.625335, 0.775545
0.643394, 0.817473
0.664620, 0.855119
0.688812, 0.871693
0.688003, 0.821643
0.710374, 0.925035
0.707544, 0.806716
0.715091, 0.888156
0.717921, 0.880473
0.724148, 0.976665
0.749054, 0.927010
0.757544, 0.961913
0.763204, 0.959608
0.783016, 0.983426
0.781601, 0.971133
0.797166, 1.028756
0.802827, 1.031060
0.805657, 0.999560
0.821223, 0.966523
0.822638, 0.957304
0.842449, 1.038744
0.843864, 1.028756
0.859431, 1.049500
0.865091, 1.058719
0.876411, 1.077159
0.882072, 1.086378
0.889147, 1.077159
0.901883, 1.024914
0.904714, 1.017231
0.908605, 1.100208
0.913204, 1.107122
0.936553, 1.130171
0.937261, 1.116342
0.967447, 1.159370
0.969806, 1.205310
0.978301, 1.104817
0.983956, 1.101525
1.000000, 1.167820
</pre>
{{cob}}
:104 points. [[Special:Contributions/172.71.154.39|172.71.154.39]] 19:17, 22 November 2022 (UTC)

:: Can someone please check my work https://colab.research.google.com/drive/1c_7Qj3S1VXtL-AckfSfHCd4ofGYYDYH5 and tell me if I'm doing it right? I'm pretty sure I don't really know what I'm doing. I kind of cargo cult-coded the Savitzky-Golay filter stuff linked from the explanation and have zero understanding of what's actually going on. [[Special:Contributions/172.70.211.126|172.70.211.126]] 21:58, 22 November 2022 (UTC)

:: Here's how Randall seems to be suggesting to do it, based on the light gray figures: [superceded] -- Can someone please help fix the residuals on the second plot? [[Special:Contributions/172.71.154.158|172.71.154.158]] 01:18, 23 November 2022 (UTC)
::: I fixed the residuals and added an inset confidence interval comparisons for the two slopes, split by both their maximum difference and by the maximum sum of the r2 values: https://colab.research.google.com/drive/1apKDIN5FE32mtGiQew5cE6wK6m6eM_Fr It's not clear from the gray text which method Randall is suggesting. [[Special:Contributions/172.70.211.126|172.70.211.126]] 22:07, 24 November 2022 (UTC)
:::: I added this to the end of the Colab notebook:

# Later in the Explainxkcd explanation, a "Significance of the Difference between Two Slopes Calculator"
# at https://www.danielsoper.com/statcalc/calculator.aspx?id=103 is recommended, so ... we get:

# split by maximum slope difference: (as shown in green and red)
# t-Value: 5.52246856
# Degrees of freedom: 100
# Probability: 0.00000027 (significant as < 0.05)

# split by maximum sum of r²s:
# t-Value: 6.25478825
# Degrees of freedom: 100
# Probability: 0.00000001 (also very significant)

# So, while the latter might technically be about 27 times more likely, both represent undoutably
# different linear fits. Perhaps someone can ask Randall which he was suggesting, if indeed either?

:::: What's the most reliable way to ask Randall this? Twitter? Email? Google Chat? [[Special:Contributions/172.71.158.91|172.71.158.91]] 23:08, 24 November 2022 (UTC)
::::: Why don't you generate a series of mildly noisy datasets of two slightly different but random lines each and see which method gets closest to the generating parameters? Also, please put more blank lines in your code, and consider right-aligning the comments. [[Special:Contributions/172.70.211.146|172.70.211.146]] 01:56, 26 November 2022 (UTC)

What's funny is people are doing a lot of statistics and computer magic when you can just tilt your screen like the comic says and get the same effect :P {{unsigned ip|172.70.54.52|16:14, 25 November 2022}}
:(Ɔ┴∩) ᄅᄅ0ᄅ ɹǝqɯǝʌoN ϛᄅ 'ㄣϛ:ㄥƖ ᄅᄅᄅ˙ᄅ9Ɩ˙0ㄥ˙ᄅㄥƖ ¡ƃuoɹʍ ʇᴉq ɐ ʇuǝʍ ƃuᴉɥʇǝɯos ʇnq 'ʇɐɥʇ pǝᴉɹʇ I

2702: What If 2 Gift Guide

2022-11-25T20:05:16Z

172.70.214.253: /* Explanation */

{{comic
| number = 2702
| date = November 23, 2022
| title = What If 2 Gift Guide
| image = what_if_2_gift_guide_2x.png
| imagesize = 500x878px
| noexpand = true
| titletext = BABIES OR LITERATURE BUT NOT BOTH: Baby shoes
}}

==Explanation==
{{incomplete|Created by an OUT-OF-CONTROL HANDHELD NEUTRINO CYLINDER FOR TEENS. Do NOT delete this tag too soon.}}

[[Randall Munroe]], author of xkcd, is promoting his new book, ''[https://xkcd.com/what-if-2/ What if? 2]'', and starts by explaining the kind of recipient who might appreciate it before giving both direct and humorously indirect instructions of how to obtain it for them, the latter method making a jocular (but not completely wrong) presumption that almost any text-input widget leads to some relevant search-engine result.

He also suggests some other tongue-in-cheek gift ideas for several other subtypes of gift-receiver. Most of which are, in keeping with the What If ethos, somewhat dangerous or impractical. A number directly reference things previously mentioned or depicted by xkcd.

{| class="wikitable"
|+
|-
! Interest !! Gift Idea !! Explanation
|-
| Engineering || The {{w|International Prototype of the Kilogram|platinum cylinder}} formerly used to identify the kilogram || This is an object of historical relevance of which only six exist, making it a very expensive or illegal gift. With the {{w|2019 redefinition of the SI base units|redefinition of the SI base units}} in 2019, {{w|2019_redefinition_of_the_SI_base_units#Kilogram|the kilogram}} is now defined using only natural constants rather than a physical standard. It took some time before this last SI unit was redefined, 3 years prior to this comic's release. The old prototypes are no longer as important as they were when they were actually used to define the kilogram. But they are still historical artifacts with enormous value, even apart from the value of a kilogram of platinum (about $32 000 at time of writing).
|-
| Biology || The genomes of the scientists who headed the human genome project || The "International Human Genome Sequencing Consortium," as the {{w|Human Genome Project}} team was known, involved scientists from twenty institutions in six countries. In the US, it was initially led by DNA structure co-discoverer {{w|James Watson}} who was succeeded by {{w|Francis Collins}}. In the UK, the project was led by {{w|John Sulston}}. The teams from other countries' institutions were less prominent and performed substantially less work on the initial sequencing. James Watson's genome was sequenced in 2007. The genome of {{w|Craig Venter}}, the CEO of {{w|Celera Genomics}}, was used as the exemplar for Celera’s sequence. While the “race” between Celera and NIH was declared a tie by then-President Clinton, in actuality, Celera had some 85+% coverage while NIH was about 50%.
|-
| Physics || A beam of neutrinos delivered through the earth by the LHC || {{w|Neutrino}}s interact very weakly with other particles, to the point that they almost always pass straight through matter completely unaffected. This means that particle accelerators can send neutrinos to any other point on Earth by aiming the particle beam into the ground, and the neutrinos pass straight through the Earth. This point is referenced in the What-If article "{{what if|73|Lethal Neutrinos}}". The low interactivity of neutrinos would also mean that the recipient would be unable to perceive their gift, making this a poor present for anyone except the small proportion of physics aficionados who already have a neutrino detector on-hand.
|-
| Animals || Surprise wildlife encounter (gift-wrapped box with a bobcat inside) || This is a reference to [https://www.explainxkcd.com/wiki/index.php/Category:Bobcats xkcd's rich history of mailing boxed bobcats to people]. This gift would place the recipient in a perilous situation, and, although definitely a wildlife encounter, is not a good gift.{{Citation needed}}
|-
| Law || A vacation to that area of Idaho where you can commit crimes with impunity due to a court district boundary error || This refers to the "{{w|Zone of Death (Yellowstone)|Zone of Death}}", a 50-square-mile area of Yellowstone National Park that is in the physical boundaries of Idaho, but in the legal jurisdiction of Wyoming. Because a jury in the United States must be composed of residents of the same district ''and'' state in which the crime was committed, but no one lives in this small area of a National Park, anyone who committed a crime here could not possibly receive a trial, and thus could not legally be punished for said crime in any circumstance. This is an interesting legal loophole, but going to this area does not provide any more value than hearing about it, and could scare your law-enthusiast friend.
|-
| Chemistry || A necklace of element samples whose symbols spell out the recipient's name (note: names like "Katherine" and "Brandon" may cause radiation accidents.) || Novelty necklaces are a common and innocuous gift, and using element symbols in place of the same letter is a common gimmick, such as in the title of Breaking Bad. However, making an object out of whatever element sample corresponds to someone's name could have unpredictable results - some elements in their pure form are too brittle or have too low a melting point for such an application, although placing the samples in some kind of small container could work around this problem; some are unsafe. "Katherine" would be made from Potassium (highly reactive), Astatine (rare, '''radioactive''' and has a short half-life), Hydrogen (gaseous at room temperature, flammable), Erbium, Iodine (sublimes into a gas at room temperature), and Neon (gaseous at room temperature). "Brandon" would be made from Boron, Radium ('''radioactive'''), Neodymium, Oxygen (gaseous at room temperature), and Nitrogen (gaseous at room temperature). The problems with element samples could be partially alleviated by allowing compounds rather than pure elements, but the radioactivity would still be a problem, and neon does not form compounds and as such is always gaseous. Additionally, the letter Q does not appear in the periodic table symbols, so a name like Quinn would be problematic.
|-
| Puzzles || Two goats and a new car || This is a reference to the the "{{w|Monty Hall problem}}", in which a game show contestant can win only one of the three items. (See [[1282: Monty Hall]] for another cartoon inspired by this problem.) This gift places the recipient within a puzzle which is typically discussed hypothetically, rather than happening in real life. Although many people would consider a new car a ''great'' gift, those who would appreciate a gift of a goat are more uncommon.
The problem that the recipient would have would likely be how to transport the two goats - it'd be difficult to fit both into a compact car at once, but one can't be left behind unattended (especially not with [[2348: Boat Puzzle|a cabbage or a wolf]]).
|-
| Technology || Cybiko® wireless handheld computer for teens (2000) || This is a callback to [https://xkcd.com/2699/ one of the previous week's comics], which humourously suggested that this device is a better option than most of the current popular communication technologies. While an interesting example of the history of communication technology and coming from a time when experimentation was common and standards were few, it isn't very useful now, because it is no longer supported, has a communication range of 100 meters (sending text messages via radio) and one can only use it to communicate with users of the same device. However, technology enthusiasts could find it interesting as a collectors' item, so by all means it is one of the most plausible gift ideas on this list.
|-
| Space || Webb telescope personal photoshoot || The Webb telescope belongs to NASA, the ESA and the CSA, and is currently very far from Earth. It is designed to capture distant space objects in previously unseen detail. If the photoshoot implies photographing a nearby human, it is not designed to do this, even if the difficulties of sending a human about a million miles to it's location could be overcome. On the other hand, if it means photographing the recipient on the earth's surface, Webb would have to point at the warm Earth and expose its optics to the Sun, permanently crippling the telescope ([https://webb.nasa.gov/content/about/faqs/faqLite.html Which is forbidden by NASA.]) and it would not have sufficient resolution to make out the subject in any case. These circumstances make it a highly impractical gift, to all intents and purposes to the point of impossibility.

On the other hand, a gift experience of being allowed to take your own snapshot of Webb in position, perhaps with a [https://www.dailymail.co.uk/sciencetech/article-10442913/James-Webb-Space-Telescope-seen-Earth-settles-orbit.html robotic telescope], might be an attractive gift to a space enthusiast! So might a chance to use the Webb telescope to take pictures of whatever celestial objects one chooses, as time on the Webb telescope is very carefully allocated.
|-
| Literature || Stephen King's writing desk (he's still using it so you'll have to fight him) || {{w|Stephen King}} is an author lucky enough to have legendary status while still alive. The desk of an author that has died would become an object of historic significance and would likely be either kept for exhibition or auctioned by their respective estate, but as Stephen King is still alive, he would probably object to his desk being subjected to the same.
|-
| Philosophy || Out-of-control trolley || This is another gift that places the recipient in the situations that they like discussing hypothetically. This refers to the {{w|trolley problem}}, which places stress on the person forced to make the decision, and exists to make them examine their morals. Facing someone with the hypothetical problem is already not a good gift, but [https://www.youtube.com/watch?v=1sl5KJ69qiA forcing them to live through it in real life] is a terrible gift. (See [[1455: Trolley Problem]] for another cartoon inspired by this problem.)
|-
| Psychology || A nice gift with a note saying you don't expect anything in return || This is perhaps the most viable option on this list. This kind of gift giving could induce the Benjamin Franklin effect, causing the gift giver to like the recipient more. It could also be used to manipulate the recipient by increasing pressure to reciprocate. This would cause them stress, making it a bad gift, but a psychologist would hopefully understand it to be a joke.
|-
| (Title text) Babies or literature but not both || Baby shoes || This is a reference to the six-word story {{w|For sale: baby shoes, never worn}} which is often attributed to Ernest Hemingway. Someone with babies, such as expecting or new parents would find baby shoes as a valuable gift for their child. Someone interested in literature would see the reference to a famous work. But someone who understands the reference would possibly also be sad if they simultaneously actually enjoyed babies or have children of their own (since the story implies the seller was expecting a baby but there was an accident).
|}

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

What If? 2 Gift Guide

What if? 2 makes a good gift for anyone who's into science, absurd ideas, or just the universe in general. To order, go to xkcd.com/whatif2, or just type "what if 2" into some random box on your device; it will probably work.

Here are some other gift ideas for hard-to-shop-for science enthusiasts:

Interest - Gift Idea

Engineering - The platinum cylinder formerly used to define the kilogram 
Biology - The genomes of the scientists who headed the human genome project 
Physics - A beam of neutrinos delivered through the earth by the LHC 
Animals - Surprise wildlife encounter (gift-wrapped box with a bobcat inside) 
Law - A vacation to that area of Idaho where you can commit crimes with impunity due to a court district boundary error 
Chemistry - A necklace of element samples whose symbols spell out the recipient's name (note: names like "Katherine" and "Brandon" may cause radiation accidents.) 
Puzzles - Two goats and a new car 
Technology - Cybiko® Wireless Handheld Computer for Teens (2000) 
Space - Webb telescope personal photoshoot 
Literature - Stephen King's writing desk (he's still using it so you'll have to fight him) 
Philosophy - Out-of-control trolley 
Psychology - A nice gift with a note saying you don't expect anything in return. 

{{comic discussion}}

[[Category:Book promotion]]
[[Category:Bobcats]]

2699: Feature Comparison

2022-11-19T06:12:58Z

172.70.214.253: /* Explanation */ copyedit

{{comic
| number = 2699
| date = November 16, 2022
| title = Feature Comparison
| image = feature_comparison_v2.png
| imagesize =
| noexpand = true
| titletext = Below the Web, and the Dark Web, a shadowy parallel world of Cybiko users trade messages on the Translucent Neon Plastic Web.
}}

==Explanation==
{{incomplete|Created by a MULTIHOMED MESH NODE. Do NOT delete this tag too soon.}}

This comic compares different remote communication services, including the relatively well-known {{w|Twitter}}, {{w|Discord}}, {{w|Mastodon (software)|Mastodon}}, {{w|Facebook}} (FB), {{w|Slack (software)|Slack}}, {{w|Signal (software)|Signal}}, {{w|Internet Relay Chat}} (IRC), {{w|Tumblr}}, {{w|Reddit}}, and {{w|SMS}} mobile telephone text messages. It also includes the less well-known {{w|Cybiko}}® wireless handheld computer for teens. For each of these, it purports to indicate which of various features they support. The comic illustrates how feature comparison charts and infographics can be abused by sellers who are trying to make their products look better than they really are, compared to their competitors. The comic was likely inspired by the recent news coverage of Twitter's purchase by {{w|Elon Musk}}, and the subsequent mass firings and resignation of its staff, causing many users to start looking for alternatives.

The Cybiko was a handheld computer designed for teens and released in 2000, which featured its own two-way radio text messaging capabilities along with built-in games and a music player. Additional information about it is available at [http://cultureandcommunication.org/deadmedia/index.php/Cybiko the Dead Media Archive], as the device has not been manufactured since 2003. The chart suggests that the Cybiko has an advantage over all of the other listed communication services, as it is capable of all eight of the table's listed features listed, with none of the others being close.

The features compared are {{w|Private message|direct messaging}}, {{w|group chat}}s, {{w|file transfer}}, built-in {{w|video game|games}}, instances of the software run by individual users instead of the corporation producing it, lack of a {{w|Server (computing)|central server}} requirement, {{w|mesh networking}}, and wireless message delivery without an active internet connection.

Mesh networking is a form of connectivity that reduces or removes the need for a centralized server or predefined gateways to a communications 'backbone'. Nodes communicate directly with any nodes that happen to be contactable, and from there may connect through to whatever nodes are in mutual contact, or to be found further afield, either in real-time or asynchronously. The Cybiko has this ability, as well as wireless message delivery because it communicates directly to other devices via radio, hence the ability to operate without any internet connectivity at all. There are several {{w|Comparison of software and protocols for distributed social networking|ongoing projects for distributed social networking}}, but all of these additionally require a hardware layer to provide signalling via their respective protocols. The Cybiko provides such via its decentralized radio capabilities.

The comic does not mention the downsides of the Cybiko, that being purchasing and finding friends who own one can be its own challenge, as it was discontinued nearly 20 years ago. Additionally, the comparison can be considered apples to oranges, since Cybiko is a ''device'' rather than a ''service''; a fairer comparison would be to a modern {{w|smartphone}}, which can provide most of these features via multiple apps, including ones written especially for such rival services. Even ignoring the above, some of the Cybiko's "advantages" come with their own drawbacks: while not requiring a central server nor the Internet, for example, is touted as a plus, the Cybiko instead relies on having other devices in proximity to relay messages, meaning unless the person you are sending to is nearby it will not function, which is not an issue of any of the other options.

This comic contains several errors. Mastodon doesn't require a central server, or support file transfer. Discord does not provide for user-run instances itself, only user-moderated and administrated instances. (There are two third party Discord server implementations, but it is unclear whether those could be counted as run by users.) Slack does not provide for user-run instances itself. Reddit does not provide for user-run instances at all, only user moderation and administration. IRC does require at least one central server,[https://www.rfc-editor.org/rfc/rfc1459.html] and relegates file transfer support to the domain of client extensions. Signal is heavily used in user-run instances via a diverse ecosystem of code forks; many of these don't require a central server, a couple use mesh networking. Reddit occasionally does have built-in games. Finally, Tumblr and SMS both have a form of group chats. An earlier version of the comic suggesting that Mastodon has no user-run instances was corrected by [[Randall]] shortly after publication of the original.

The title text refers to the translucent plastic covers that were popular in the late 1990s and early 200xs.

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

:[A table with checkmarks to indicate which features various messaging services have. Each column is labeled with a service name and its logo beneath, except that for the last column, the device's longer name is written higher than all the other services' names, with an arrow pointing to a drawing of the device below it.]

{| class="wikitable"
|-
!
! Twitter
! Discord
! Mastodon
! FB
! Slack
! Signal
! IRC
! Tumblr
! Reddit
! SMS
! Cybiko® wireless handheld computer for teens (2000)
|-
! Direct messages
| ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓
|-
! Group chats
| ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || || ✓ || || ✓
|-
! File transfer
| || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || || ✓ || || ✓
|-
! Built-in games
| || ✓ || || ✓ || || || || || || || ✓
|-
! User-run instances
| || ✓ || ✓ || || ✓ || || ✓ || || ✓ || || ✓
|-
! Doesn't require central server
| || || || || || || ✓ || || || || ✓
|-
! Mesh networking
| || || || || || || || || || || ✓
|-
! Wireless message delivery works without internet
| || || || || || || || || || ✓ || ✓
|-
|}

{{comic discussion}}
[[Category:Charts]]
[[Category:Social networking]]

2699: Feature Comparison

2022-11-17T13:49:36Z

172.70.214.253: /* Explanation */ source from talk

{{comic
| number = 2699
| date = November 16, 2022
| title = Feature Comparison
| image = feature_comparison_v2.png
| imagesize =
| noexpand = true
| titletext = Below the Web, and the Dark Web, a shadowy parallel world of Cybiko users trade messages on the Translucent Neon Plastic Web.
}}

==Explanation==
{{incomplete|Created by a MULTIHOMED MESH NODE. Do NOT delete this tag too soon.}}

This is comparing different remote communication services, including the relatively well-known {{w|Twitter}}, {{w|Discord}}, {{w|Mastodon (software)|Mastodon}}, {{w|Facebook|Facebok}} (FB), {{w|Slack (software)|Slack}}, {{w|Signal (software)|Signal}}, {{w|Internet Relay Chat}} (IRC), {{w|Tumblr}}, {{w|Reddit}}, and {{w|SMS}} (mobile telephone text messages).

The less well-known "{{w|Cybiko}}® wireless handheld computer for teens (2000)" was a handheld computer designed for teens and released in 2000, which featured its own two-way radio text messaging system. The Cybiko has two-way communication capabilities along with built-in games and music player capabilities. Additional information about it is available at [http://cultureandcommunication.org/deadmedia/index.php/Cybiko the Dead Media Archive], as the device has not been manufactured since 2003. The chart suggests that the Cybiko has an advantage over all of the other ten communication services listed, as it has all eight of the features listed in the table, whereas none of the other services under consideration have more than five of the features. Of course, purchasing a Cybiko or finding friends who own one can be its own challenge, as device was discontinued nearly 20 years ago.


{{w|Mesh networking}} is the ability for users to have P2P connections, and talk without a centralized server. The Cybiko has this as well as wireless message delivery because it communicates to other devices via radio hence the ability to operate without any internet connectivity at all.

This comic contains several errors. Mastodon doesn't require a central server, or support file transfer. Discord does not provide for user-run instances itself. (There are two third party Discord server implementations, but it is unclear whether those could be counted as user-run instances of Discord.) Slack does not provide for user-run instances itself. Reddit does not provide for user-run instances at all, only user moderation and administration. IRC does require at least one central server,[https://www.rfc-editor.org/rfc/rfc1459.html] and relegate file transfer support to the domain of client extensions. Signal is heavily used in user-run instances via a diverse ecosystem of code forks; many of these don't require a central server, a couple use mesh networking. Reddit occasionally does have built-in games. Finally, Tumblr does have a form of group chats.

An earlier version of the comic suggesting that Mastodon has no user-run instances was corrected by [[Randall]] shortly after publication of the original.




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

:[A table with checkmarks to indicate which features various messaging services have. Each column is labeled with a service name and its logo beneath, except that for the last column, the device's longer name is written higher than all the other services' names, with an arrow pointing to a drawing of the device below it.]

{| class="wikitable"
|-
!
! Twitter
! Discord
! Mastodon
! FB
! Slack
! Signal
! IRC
! Tumblr
! Reddit
! SMS
! Cybiko® wireless handheld computer for teens (2000)
|-
! Direct messages
| ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓
|-
! Group chats
| ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || || ✓ || || ✓
|-
! File transfer
| || ✓ || ✓ || ✓ || ✓ || ✓ || ✓ || || ✓ || || ✓
|-
! Built-in games
| || ✓ || || ✓ || || || || || || || ✓
|-
! User-run instances
| || ✓ || ✓ || || ✓ || || ✓ || || ✓ || || ✓
|-
! Doesn't require central server
| || || || || || || ✓ || || || || ✓
|-
! Mesh networking
| || || || || || || || || || || ✓
|-
! Wireless message delivery works without internet
| || || || || || || || || || ✓ || ✓
|-
|}

{{comic discussion}}
[[Category:Charts]]
[[Category:Social networking]]

2694: Königsberg

2022-11-06T23:35:25Z

172.70.214.253: /* Explanation */ wikilink to Washington Monument's relevant section

{{comic
| number = 2694
| date = November 4, 2022
| title = Königsberg
| image = konigsberg_2x.png
| imagesize = 448x343px
| noexpand = true
| titletext = At first I thought I would need some gold or something to pay him, but then I realized that it was the 18th century and I could just bring a roll of aluminum foil.
}}

==Explanation==
{{incomplete|Created by a WOLF, TWO GOATS, AND THREE BAGS OF GRAPH NODES. Do NOT delete this tag too soon.}}

[[File:Konigsberg bridges.png|frame|right|{{w|Königsberg}}, Prussia in Euler's time, showing the Pregel river and its seven bridges.]]

This comic is about the {{w|Seven Bridges of Königsberg}} (present day {{w|Kaliningrad}}), a seminal {{w|graph theory}} problem solved by the famous mathematician {{w|Leonhard Euler}}.[https://www.maa.org/press/periodicals/convergence/leonard-eulers-solution-to-the-konigsberg-bridge-problem] The problem was whether a path through the city crossing each of the seven bridges just once exists, without crossing the river forks any other way. In 1736, Euler proved that there is no such path. This result is considered to be the first theorem of graph theory and the first proof in the theory of networks[http://www-personal.umich.edu/~mejn/courses/2004/cscs535/review.pdf] — a subject now generally regarded as a branch of {{w|combinatorics}} — and presaged the development of {{w|topology}}. Combinatorial problems of other types had been considered since antiquity. {{w|Graph (discrete mathematics)|Graphs}} are a data structure common in many algorithmic problems in computer science.

[[Cueball]] attempts to cheat on the final exam in his algorithms class by traveling back in time to commission the construction of an eighth bridge before Euler could learn of the problem, allowing a trivial solution that would remove the rationale for further analysis. He hopes that this would alter his present-day timeline in such a way that the test becomes easier because graph theory might never have been developed.

With the addition of the eighth bridge, it becomes possible to cross each bridge exactly once, starting at the north bank and ending on the larger eastern island, or vice-versa. However, there is still no way to traverse each bridge exactly once and return to the starting point, because the altered graph would have an {{w|Eulerian trail|Euler trail}} but not an Euler cycle. Thus the problem might still have been interesting to Euler. (Adding a ninth bridge connecting the north bank to the east island, or constructing the eighth bridge between the eastern and central islands rather than the location provided, would render the problem completely trivial.) We can't say whether Euler or others would have developed graph theory anyway, or whether Cueball's exam would have been any easier, more difficult, or similar.

An alternative modification allowing an easy solution is to remove bridges. During World War II, two bridges to the central island connecting it to the north and south banks were destroyed by bombing, so today there is an Eulerian trail across the five remaining bridges.

The title text alludes to the fact that ordinary {{w|aluminum foil}}, which was not commercially available until 1911, would have been a tremendously valuable curiosity in the 18th century, which didn't even have {{w|tin foil}}. Aluminum was a highly priced metal before the 1880s when inexpensive methods were developed to refine it. The {{w|Washington Monument#Aluminum_apex|Washington Monument}} was constructed with a tip made of pure aluminum due to its value and conductive capacity. Aluminum had not been extracted in its pure form at the time of Euler, and was known only in compounds such as {{w|alum}}, so the metal would have been unique and exotic.

==Transcript==

:[Cueball, standing next to two men wearing wigs, pointing with a pointer at a map showing the seven bridges problem, with an extra bridge added in dashed lines]
:Cueball: Lord Mayor of Königsberg, I will reward you handsomely if you construct this bridge before my friend Leonhard arrives.

:[Caption below the panel:]
:I tried to use a time machine to cheat on my algorithms final by preventing graph theory from being invented.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring real people]]
[[Category:Math]]
[[Category:Programming]]

2694: Königsberg

2022-11-05T05:14:29Z

172.70.214.253: /* Explanation */ no evidence that this was popular; otherwise proofs by enumeration would have been very likely

{{comic
| number = 2694
| date = November 4, 2022
| title = Königsberg
| image = konigsberg_2x.png
| imagesize = 448x343px
| noexpand = true
| titletext = At first I thought I would need some gold or something to pay him, but then I realized that it was the 18th century and I could just bring a roll of aluminum foil.
}}

==Explanation==
{{incomplete|Created by a FOX, TWO CHICKENS, AND THREE BAGS OF GRAIN. Do NOT delete this tag too soon.}}

[[File:Konigsberg bridges.png|frame|right|{{w|Königsberg}} in Euler's time, showing the river Pregel and its seven bridges]]

This comic is about the {{w|Seven Bridges of Königsberg}}, a seminal {{w|graph theory}} problem addressed by the famous mathematician {{w|Leonhard Euler}}. The problem is to devise a path through the city that would cross each of the seven bridges exactly once, without crossing the river forks any other way. In 1736, Euler proved that there was no solution possible. This result is considered to be the first theorem of graph theory and the first proof in the theory of networks[http://www-personal.umich.edu/~mejn/courses/2004/cscs535/review.pdf] — a subject now generally regarded as a branch of {{w|combinatorics}} — and presaged the development of {{w|topology}}. Combinatorial problems of other types had been considered since antiquity.

[[Cueball]] attempts to cheat on the final exam in his algorithms class by traveling back in time to commission the construction of an eighth bridge before Euler could learn of the problem, granting it a trivial solution that would remove much impetus for mathematical analysis. He hopes that this would alter his present-day timeline in such a way that the test becomes easier because graph theory might never have been developed.

With the addition of the eighth bridge, it becomes possible to create a path that crosses each bridge exactly once, starting at the north bank and ending on the eastern island (or vice-versa). However, there would remain no way to traverse each bridge exactly once and return to your starting point, because the altered graph would have an {{w|Euler trail}} but not an {{w|Euler cycle}}. Thus, the problem might still have been sufficiently interesting to spark Euler's curiosity. Adding a ninth bridge connecting the north bank to the east island would render the problem completely trivial. Without the seven bridges problem, Euler could have focussed on a different foundation for graph theory, possibly making an even harder examination in Cueball's time.

The title text alludes to the fact that ordinary {{w|aluminum foil}}, which was not commercially available until 1911, would have been a tremendously valuable curiosity in the 18th century, which didn't even have {{w|tin foil}}. Aluminium itself was a highly priced metal before the 1880s, when methods were developed to cheaply refine it. Famously, the {{w|Washington Monument}} was constructed with a tip made of pure aluminum due to its great value and conductive capacity. Aluminum had not even been extracted in its pure form at the time of Euler, and was only known in compounds such as {{w|alum}}, so it would have been rare and exotic indeed.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Cueball, standing next to two men wearing wigs, pointing with a pointer at a map showing the 7 bridges problem, with an extra bridge added in dashed lines]
:Cueball: Lord mayor of Königsberg, I will reward you handsomely if you construct this bridge before my friend Leonhard arrives.

:[Caption below the panel]
:I tried to use a time machine to cheat on my algorithms final by preventing graph theory from being invented.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring real people]]
[[Category:Math]]
[[Category:Programming]]

2640: The Universe by Scientific Field

2022-10-31T23:45:52Z

172.70.214.253: /* Explanation */

{{comic
| number = 2640
| date = July 1, 2022
| title = The Universe by Scientific Field
| image = the_universe_by_scientific_field.png
| titletext = The math and philosophy people also claim everything, but the astronomers argue that the stuff they study really only comprises a small number of paper surfaces.
}}

==Explanation==

{{w|Astronomy}} is the study of outer space and celestial phenomena. This comic makes a joke that most of the "universe" falls under the study of astronomy, which makes sense because it is so vast and large and is not studied directly by other fields of science.

The volume of the {{w|observable universe}} is 3.566×1080 cubic meters. The volume of Earth is 1.08321×1021 cubic meters. 1.08321×1021 m3 ÷ 3.566×1080 m3 × 100% ≈ 3×10-58%, which is scientific notation for the second of the two percentages, the first being its difference from 100%.

Thus, the universe is comprised almost entirely of the objects of astronomical study, when measured by volume. There are many arguments to be made that this is not the most useful way of measuring the size of scientific fields compared to the universe. Other arguments include:
*Astronomers are only studying the {{w|Observational astronomy|observable phenomena}} (i.e. light, subatomic particles, and gravity) of the rest of the universe, leaving the vast majority of the universe's properties (for instance the geology and biochemistry of an unknown planet in a distant galaxy) entirely unstudied.
*Astronomy is only possible due to understanding of physics, optics, chemistry, mathematics, and geometry, so surely they deserve some credit.
*The interesting parts of the universe are not the empty space.
**They are the matter and energy described by physics and chemistry.
**They are the life experiences of people, which are overwhelmingly terrestrial even for professional astronomers (who often complain about how little time they can allocate to making actual astronomical observations).
*It is disingenuous to claim to be studying more than every other field when astronomy and astrophysics publications amount to only about 0.5% of academic science and engineering output worldwide.[https://ncses.nsf.gov/pubs/nsb20214/table/SPBS-34] Other fields may be studying smaller things, but they are studying them much more thoroughly.
*Emptiness has less information and is less interesting than non-emptiness; therefore geometric volume is only very weakly correlated with useful information.

A counterargument is that astronomy, {{w|cosmology}}, and astrophysics are the only scientific disciplines that study the {{w|Big Bang}} and subsequent {{w|Inflation (cosmology)|inflation}} from which all matter, energy, and space itself arose. The ordinary laws of physics can describe neither of those events.

The title text says that mathematicians and philosophers claim that what they study also represents everything. But (according to the comic) astronomers counter this by saying that they just study things that are written down, and this comprises just tiny amounts of "paper" on the Earth. This claim by mathematicians also appears in [[435: Purity]]. A conceivable counterargument by philosophers could be that any and all science, including astronomy, is nothing more than a branch of {{w|epistemology}}, the philosophical study of knowledge. Another could be that since philosophy includes theology, it is studying something even larger than the universe (although one could argue back that theology is nothing more than writing fiction, and yet again just a study of pieces of paper.)

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

:The Universe by Scientific Field

:[A pie chart is shown. It is white except for a single black line going from the edge of the circle to the middle.]
:Astronomy [The white space]
:99.9999999999999999999999999999999999999999999999999999999997%

:Other [The black line]
:0.0000000000000000000000000000000000000000000000000000000003%

{{comic discussion}}

[[Category:Pie charts]]
[[Category:Science]]
[[Category:Astronomy]]
[[Category:Math]]
[[Category:Philosophy]]

2649: Physics Cost-Saving Tips

2022-10-31T00:34:04Z

172.70.214.253: /* Table of tips */ tighten

{{comic
| number = 2649
| date = July 22, 2022
| title = Physics Cost-Saving Tips
| image = physics_cost_saving_tips.png
| titletext = I got banned from the county fair for handing out Helium-2 balloons. Apparently the instant massive plasma explosions violated some local ordinance or something.
}}

==Explanation==
{{incomplete|Created by a FAUX VECTOR - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
This is another one of [[Randall|Randall's]] [[:Category:Tips|Tips]], this time with a series of Physics Cost-Saving Tips. It also continues the previous [[2648: Chemicals]] comic's jocular theme of tricks to supposedly save money based on misinterpretations of science.

It suggests four ways to reduce costs or provide something for free for physicists to save money on their research. For instance getting free electrons from a conductor or replacing regular {{w|helium}} with {{w|Isotopes_of_helium#Helium-2_(diproton)|helium 2}}. None of these would provide any real advantages even when possible to implement, and could even be very dangerous, see below in the [[#Table of tips|table]]. Obtaining money from physics experiments was also described in [[2007: Brookhaven RHIC]].

In the title text, Randall claims to have been banned from the county fair for handing out helium-2 balloons because of the instant massive explosions caused by its radioactive decay (that helium-2 decays fast is mentioned in the comic, with a joke suggestion to use it quickly). He jokes that the balloons violated a local ordinance. {{w|Gas balloon|Helium balloons}} are often given out at county fairs and similar events, but they are filled with {{w|helium-4}} and therefore inert (a very small part will be {{w|helium-3}}, 2 ppm). A balloon filled with helium-2 is a practical impossibility because of its nanosecond half-life. Assuming a 12-inch diameter balloon at 1 atmosphere of pressure, the balloon-bomb would have a yield of roughly 17 {{w|TNT equivalent|tons of TNT equivalent}}.
{{cot|[[User:SqueakSquawk4|Calculations]]}}
{{User:SqueakSquawk4}} 
{{cob}}
The smallest nuclear bomb, the {{w|W54}}, had a yield of between 10 and 1,000 tons of TNT. The largest conventional bomb, the {{w|GBU-43/B MOAB}}, has a yield of roughly 11 tons. The {{w|2020 Beirut explosion}} was roughly equivalent to 500 tons. So, while the helium-2 balloon bomb would be larger than all conventional bombs, it would still be smaller than most nukes. Handing out what are effectively small atomic bombs at a county fair would not go down well with any surviving local authorities, so merely being banned is a very mild punishment. Criminal charges such as mass murder and terrorism would be more likely if it weren't for the absurd impossibility of the scenario.

===Table of tips===
{| class="wikitable"
|-
! scope="col" |Cost-Saving Tip
! scope="col" |Explanation
|-
|Try replacing regular vectors with pseudovectors whenever possible
|[[File:Torque animation.gif|frame|right|Relationship of pseudovectors {{w|torque}} ('''τ''') and {{w|angular momentum}} ('''L''') to "regular" Euclidean vectors {{w|Position (vector)|position}} ('''r'''), {{w|force}} ('''F'''), and linear {{w|momentum}} ('''p''') in an oscillatory rotating system. Not shown is the {{w|centripetal force}} of the spoke's {{w|Tension (physics)|tension}}, a Euclidean vector towards the axle proportional to linear momentum, converting it to angular momentum.]]

The prefix "pseudo-" refers to an inauthentic variation of something. Fakes are usually cheaper than their original brand-name product, while often working just as well, so the comic implies a {{w|pseudovector}} could be a less expensive substitute for a regular vector. On the contrary, pseudovectors, or axial vectors, are distinct from regular {{w|Euclidean vector}}s, which have a magnitude and direction (velocity, for example). Pseudovectors are usually being involved with rotation or physical effects that share properties with rotation, similar to the relationship between angles and lengths. Pseudovectors are formed from the {{w|cross product}}s of Euclidean vectors, in three dimensions, and while similar to Euclidean vectors, there is no physical meaning to their specific direction, only their magnitude and portions of their position. For example, {{w|angular momentum}} is described by a pseudovector, labeled '''L''' in the comic, {{w|Normal (geometry)|normal}} to the {{w|plane of rotation}}, originating from the center of rotation, with magnitude equal to the angular velocity of rotation '''ω''' multiplied by the {{w|moment of inertia}} '''I'''. (The comic's diagram is drawn according to very uncommon {{w|Right-hand rule#Coordinates|left-handed coordinates}} instead of the standard {{w|right-hand rule}}. Randall is right-handed.[https://www.youtube.com/watch?v=j1tcyEo2tQk&t=28s])
|-
|A square wave can be broken down into an infinite supply of valuable sine waves
|{{w|Fourier analysis}} can decompose any periodic function into a series of {{w|sine wave}}s. A {{w|square wave}} is equal to the sum of an infinite series of sine waves. However, the sine waves are not removed or separated individually, so such a {{w|Fourier transform}} does not produce a "supply" of sine waves for practical use in any tasks other than analysis, and as abstract mathematical objects are exempt from the laws of supply and demand, their value is similarly limited.
|-
|Cut waste by buying lighter isotopes that don't have any dead-weight neutrons
|Chemical elements are identified by the number of protons in each atomic nucleus, equal to the number of electrons in their shell (unless the atom is ionized), which dictates most of their chemical behavior. {{w|Isotopes}} are variants of the element with different numbers of neutrons in the nucleus, among which chemical behavior is usually nearly identical. The comic suggests that the neutrons don't serve any useful purpose, so, in theory, if purchasing an element by weight, and its isotopes have the same price per unit weight, then you can save money by buying isotopes with no neutrons at all. In reality, the cost per unit weight for material containing a larger concentration of normally rare isotopes, such as {{w|heavy water}} or {{w|enriched uranium}}, is much higher than the cost of material containing isotopes in their ordinary proportions. (An exception is {{w|depleted uranium}}, which costs less than regular uranium because it is a byproduct of the production of enriched uranium.) In addition, a certain range of neutron quantity is needed to keep atoms stable, as atoms with too many or too few neutrons will decay more quickly than the common isotopes. The image shown is helium-2, an {{w|Isotopes of helium|isotope of helium}} which has a half-life of less than a nanosecond. It decays into two ionized hydrogen atoms, releasing a large amount of energy—hence the explosions mentioned in the title text.
|-
|Conductors are a great source of free electrons (may carry charges)
|{{w|Charge carrier|Free}} {{w|electron}}s are electrons that are not tightly bound to specific atoms so [https://www.youtube.com/watch?v=TGUteH93xNo they can move freely,] such as in {{w|conduction band}}s of the {{w|metallic bond}}s throughout the iron ingot depicted in the comic. Randall interprets "free" in a different sense, meaning no cost. The charges free electrons carry are electric, not monetary as implied by the pun. Ordinary matter usually contains electrons, but although the {{w|dielectric}} layer of a {{w|capacitor}} can collect electrons, it is not easy to store pure electrons, as they repel each other. When a {{w|Solution (chemistry)|solution}} has free electrons, it becomes {{w|alkaline}} ({{w|Base (chemistry)|basic}}) and corrosive. Randall has [https://what-if.xkcd.com/140/ explained the problems] with collecting a large number of electrons before.
|}

==Transcript==
:[The comic shows four rows each with a drawing and an explanation text belonging to each drawing. They alternate between having the drawing on the left and the right side. Above the first row is a large header:]
:<big>Physics Cost-Saving Tips</big>

:[The first row has a drawing of a diagramatical spinning disc, at an angle. It is identified with an 'I', with a dotted axial arrow labelled 'L' and a rotational movement labelled 'ω' (small omega).
:I
:L
:ω

:[To the right of the diagram is this text:]
:Try replacing regular vectors with pseudovectors whenever possible

:[The second row shows a square wave with three maxima between four minima. Below the central maxima and the two nearby minima are five arrows pointing down (two bending left two right one straight down). Each arrow points to one of five sine waves below the square wave, in three rows, with different wavelengths. The one with the shortest wavelength is the top left, then the wavelength becomes longer for the one to the right and even longer for each of the next two, in the next row with the final very long wave with longest wavelength at the bottom, with the straight down arrow pointing to that. The long waves at the bottom has the same frequency as the square wave.]

:[To the left of the waves is this text:]
:A square wave can be broken down into an infinite supply of valuable sine waves

:[The third row shows two atomic models. The left containing two protons (white with a "+" sign), two neutrons (black) and orbited by two electrons (white with a "-" sign, small outlines, dotted orbits/movement lines). The right model is drawn similarly but without the black neutrons.]
:+ +
:- -
:+ +
:- -

:[The atoms have labels below and there is an extra message for the second model:]
:4He
:2He
:(Decays fast- use quickly)

:[To the right of the models is this text:]
:Cut waste by buying lighter isotopes that don't have any dead-weight neutrons

:[The fourth row shows a flat rectangular bar, drawn in perspective with a scattering of four small circles with "-" sign inside them and ten lines looking like parts of circles, all on the top face towards the far end.]
:- - - -

:[A bending arrow goes from a label above the bar and points to one of the circles. And on the forward-facing side of the bar there is a label.]
:Arrow: Free electrons
:Label: Iron

:[To the left of the bar is this text:]
:Conductors are a great source of free electrons
:(May carry charges)

{{comic discussion}}

[[Category:Tips]]
[[Category:Physics]]
[[Category:Chemistry]]

2649: Physics Cost-Saving Tips

2022-10-31T00:33:13Z

172.70.214.253: Clarify

{{comic
| number = 2649
| date = July 22, 2022
| title = Physics Cost-Saving Tips
| image = physics_cost_saving_tips.png
| titletext = I got banned from the county fair for handing out Helium-2 balloons. Apparently the instant massive plasma explosions violated some local ordinance or something.
}}

==Explanation==
{{incomplete|Created by a FAUX VECTOR - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
This is another one of [[Randall|Randall's]] [[:Category:Tips|Tips]], this time with a series of Physics Cost-Saving Tips. It also continues the previous [[2648: Chemicals]] comic's jocular theme of tricks to supposedly save money based on misinterpretations of science.

It suggests four ways to reduce costs or provide something for free for physicists to save money on their research. For instance getting free electrons from a conductor or replacing regular {{w|helium}} with {{w|Isotopes_of_helium#Helium-2_(diproton)|helium 2}}. None of these would provide any real advantages even when possible to implement, and could even be very dangerous, see below in the [[#Table of tips|table]]. Obtaining money from physics experiments was also described in [[2007: Brookhaven RHIC]].

In the title text, Randall claims to have been banned from the county fair for handing out helium-2 balloons because of the instant massive explosions caused by its radioactive decay (that helium-2 decays fast is mentioned in the comic, with a joke suggestion to use it quickly). He jokes that the balloons violated a local ordinance. {{w|Gas balloon|Helium balloons}} are often given out at county fairs and similar events, but they are filled with {{w|helium-4}} and therefore inert (a very small part will be {{w|helium-3}}, 2 ppm). A balloon filled with helium-2 is a practical impossibility because of its nanosecond half-life. Assuming a 12-inch diameter balloon at 1 atmosphere of pressure, the balloon-bomb would have a yield of roughly 17 {{w|TNT equivalent|tons of TNT equivalent}}.
{{cot|[[User:SqueakSquawk4|Calculations]]}}
{{User:SqueakSquawk4}} 
{{cob}}
The smallest nuclear bomb, the {{w|W54}}, had a yield of between 10 and 1,000 tons of TNT. The largest conventional bomb, the {{w|GBU-43/B MOAB}}, has a yield of roughly 11 tons. The {{w|2020 Beirut explosion}} was roughly equivalent to 500 tons. So, while the helium-2 balloon bomb would be larger than all conventional bombs, it would still be smaller than most nukes. Handing out what are effectively small atomic bombs at a county fair would not go down well with any surviving local authorities, so merely being banned is a very mild punishment. Criminal charges such as mass murder and terrorism would be more likely if it weren't for the absurd impossibility of the scenario.

===Table of tips===
{| class="wikitable"
|-
! scope="col" |Cost-Saving Tip
! scope="col" |Explanation
|-
|Try replacing regular vectors with pseudovectors whenever possible
|[[File:Torque animation.gif|frame|right|Relationship of pseudovectors {{w|torque}} ('''τ''') and {{w|angular momentum}} ('''L''') to "regular" Euclidean vectors {{w|Position (vector)|position}} ('''r'''), {{w|force}} ('''F'''), and linear {{w|momentum}} ('''p''') in an oscillatory rotating system. Not shown is the {{w|centripetal force}} of the spoke's {{w|Tension (physics)|tension}}, a Euclidean vector towards the axle proportional to linear momentum, converting it to angular momentum.]]

The prefix "pseudo-" refers to an inauthentic variation of something. Fakes are usually cheaper than their original brand-name product, while often working just as well, so the comic implies a {{w|pseudovector}} could be a less expensive substitute for a regular vector. On the contrary, pseudovectors, or axial vectors, are distinct from regular {{w|Euclidean vector}}s. Regular Euclidean vectors have a magnitude and direction (velocity, for example). Pseudovectors are usually being involved with rotation or physical effects that share properties with rotation, similar to the relationship between angles and lengths. Pseudovectors are formed from the {{w|cross product}}s of Euclidean vectors, in three dimensions, and while similar to Euclidean vectors, there is no physical meaning to their specific direction, only their magnitude and portions of their position. For example, {{w|angular momentum}} is described by a pseudovector, labeled '''L''' in the comic, {{w|Normal (geometry)|normal}} to the {{w|plane of rotation}}, originating from the center of rotation, with magnitude equal to the angular velocity of rotation '''ω''' multiplied by the {{w|moment of inertia}} '''I'''. (The comic's diagram is drawn according to very uncommon {{w|Right-hand rule#Coordinates|left-handed coordinates}} instead of the standard {{w|right-hand rule}}. Randall is right-handed.[https://www.youtube.com/watch?v=j1tcyEo2tQk&t=28s])
|-
|A square wave can be broken down into an infinite supply of valuable sine waves
|{{w|Fourier analysis}} can decompose any periodic function into a series of {{w|sine wave}}s. A {{w|square wave}} is equal to the sum of an infinite series of sine waves. However, the sine waves are not removed or separated individually, so such a {{w|Fourier transform}} does not produce a "supply" of sine waves for practical use in any tasks other than analysis, and as abstract mathematical objects are exempt from the laws of supply and demand, their value is similarly limited.
|-
|Cut waste by buying lighter isotopes that don't have any dead-weight neutrons
|Chemical elements are identified by the number of protons in each atomic nucleus, equal to the number of electrons in their shell (unless the atom is ionized), which dictates most of their chemical behavior. {{w|Isotopes}} are variants of the element with different numbers of neutrons in the nucleus, among which chemical behavior is usually nearly identical. The comic suggests that the neutrons don't serve any useful purpose, so, in theory, if purchasing an element by weight, and its isotopes have the same price per unit weight, then you can save money by buying isotopes with no neutrons at all. In reality, the cost per unit weight for material containing a larger concentration of normally rare isotopes, such as {{w|heavy water}} or {{w|enriched uranium}}, is much higher than the cost of material containing isotopes in their ordinary proportions. (An exception is {{w|depleted uranium}}, which costs less than regular uranium because it is a byproduct of the production of enriched uranium.) In addition, a certain range of neutron quantity is needed to keep atoms stable, as atoms with too many or too few neutrons will decay more quickly than the common isotopes. The image shown is helium-2, an {{w|Isotopes of helium|isotope of helium}} which has a half-life of less than a nanosecond. It decays into two ionized hydrogen atoms, releasing a large amount of energy—hence the explosions mentioned in the title text.
|-
|Conductors are a great source of free electrons (may carry charges)
|{{w|Charge carrier|Free}} {{w|electron}}s are electrons that are not tightly bound to specific atoms so [https://www.youtube.com/watch?v=TGUteH93xNo they can move freely,] such as in {{w|conduction band}}s of the {{w|metallic bond}}s throughout the iron ingot depicted in the comic. Randall interprets "free" in a different sense, meaning no cost. The charges free electrons carry are electric, not monetary as implied by the pun. Ordinary matter usually contains electrons, but although the {{w|dielectric}} layer of a {{w|capacitor}} can collect electrons, it is not easy to store pure electrons, as they repel each other. When a {{w|Solution (chemistry)|solution}} has free electrons, it becomes {{w|alkaline}} ({{w|Base (chemistry)|basic}}) and corrosive. Randall has [https://what-if.xkcd.com/140/ explained the problems] with collecting a large number of electrons before.
|}

==Transcript==
:[The comic shows four rows each with a drawing and an explanation text belonging to each drawing. They alternate between having the drawing on the left and the right side. Above the first row is a large header:]
:<big>Physics Cost-Saving Tips</big>

:[The first row has a drawing of a diagramatical spinning disc, at an angle. It is identified with an 'I', with a dotted axial arrow labelled 'L' and a rotational movement labelled 'ω' (small omega).
:I
:L
:ω

:[To the right of the diagram is this text:]
:Try replacing regular vectors with pseudovectors whenever possible

:[The second row shows a square wave with three maxima between four minima. Below the central maxima and the two nearby minima are five arrows pointing down (two bending left two right one straight down). Each arrow points to one of five sine waves below the square wave, in three rows, with different wavelengths. The one with the shortest wavelength is the top left, then the wavelength becomes longer for the one to the right and even longer for each of the next two, in the next row with the final very long wave with longest wavelength at the bottom, with the straight down arrow pointing to that. The long waves at the bottom has the same frequency as the square wave.]

:[To the left of the waves is this text:]
:A square wave can be broken down into an infinite supply of valuable sine waves

:[The third row shows two atomic models. The left containing two protons (white with a "+" sign), two neutrons (black) and orbited by two electrons (white with a "-" sign, small outlines, dotted orbits/movement lines). The right model is drawn similarly but without the black neutrons.]
:+ +
:- -
:+ +
:- -

:[The atoms have labels below and there is an extra message for the second model:]
:4He
:2He
:(Decays fast- use quickly)

:[To the right of the models is this text:]
:Cut waste by buying lighter isotopes that don't have any dead-weight neutrons

:[The fourth row shows a flat rectangular bar, drawn in perspective with a scattering of four small circles with "-" sign inside them and ten lines looking like parts of circles, all on the top face towards the far end.]
:- - - -

:[A bending arrow goes from a label above the bar and points to one of the circles. And on the forward-facing side of the bar there is a label.]
:Arrow: Free electrons
:Label: Iron

:[To the left of the bar is this text:]
:Conductors are a great source of free electrons
:(May carry charges)

{{comic discussion}}

[[Category:Tips]]
[[Category:Physics]]
[[Category:Chemistry]]