explain xkcd - User contributions [en]

Talk:2940: Modes of Transportation

2024-06-01T11:32:19Z

172.71.242.28:

I'd say a bicycle is way less dangerous than a car [[Special:Contributions/172.68.192.196|172.68.192.196]] 21:36, 31 May 2024 (UTC) (para 1/4)
:Considering only the two vehicles themselves, I would probably agree with you but this comic is about convenience and danger of various means of transport. Wouldn't you agree that using a bicycle for transport in crowded city traffic is rather more dangerous to the cyclist than using a car is to the driver? {{unsigned ip|172.69.60.138|21:46, 31 May 2024}}
:It depends on whether you're comparing worst case injuries versus injury rate. Since airliners are considered one of the safest, I think it's injury rate. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 22:07, 31 May 2024 (UTC)
:I'd say a bicycle is less dangerous than a unicycle, but apparently walking<unicycle<car<bicycle. No metric I can think of matches that order, neither danger in a vacuum, danger in a self-environment, danger in a car environment, or danger to others in any environment. I'm quite confused. --[[Special:Contributions/172.70.114.29|172.70.114.29]] 05:29, 1 June 2024 (UTC)
::On a per-passenger-mile basis, walking is over ten times more dangerous than driving, and trains are about four times as dangerous as planes. So this comic can't be about risk of death per mile. It must be something more like risk of death per hour, which is extremely low for unicycles since people don't usually ride them in life-threatening situations outside of circuses. Similarly, travelling to and from work on a pogo stick every day would be quite dangerous, but in practice, people hardly ever die on a pogo stick. So it depends how you measure it. [[User:EebstertheGreat|EebstertheGreat]] ([[User talk:EebstertheGreat|talk]]) 06:07, 1 June 2024 (UTC)
:I think there is a couple that are off on here since I think light aircraft and helicopters are also less dangerous than cars when looking at accident rates vs trips or vs miles traveled. Cars are quite dangerous. They sure are convenient though. [[Special:Contributions/172.64.238.87|172.64.238.87]] 09:57, 1 June 2024 (UTC)

Most deaths are either due to involved cars or people doing races or stunts. [[Special:Contributions/172.68.192.196|172.68.192.196]] 21:36, 31 May 2024 (UTC) (para 2/4)

I would not count "died because plane crashed onto road" into car dangers, as I would not count F1 driver death into the same bucket as car commuters. [[Special:Contributions/172.68.192.196|172.68.192.196]] 21:36, 31 May 2024 (UTC) (para 3/4)

So I would do the same for bikes. [[Special:Contributions/172.68.192.196|172.68.192.196]] 21:36, 31 May 2024 (UTC) (para 4/4)

It's not actually true that a hot air balloon has only one possible direction of travel. It seemed relevant so I added a couple of sentences to the explanation. I suspect Randall is aware of this of course, being a weather nerd. [[Special:Contributions/162.158.74.69|162.158.74.69]] 00:28, 1 June 2024 (UTC)

So which modes of transports belong in the white band between the "Zone of specialty and recreational vehicles" and the Hot air balloons? I would suggest the Autogyro (see [[1972:_Autogyros|#1972]]) between the skis and the hot air balloon. Any other suggestions? [[User:Frog23|Frog23]] ([[User talk:Frog23|talk]]) 22:44, 31 May 2024 (UTC)

I came here to find out what a sign-error is, but the description assumes I already know. {{unsigned ip|162.158.74.69|22:58, 31 May 2024}}

Are American hot air balloonists commonly fond of taking sniper rifles up with them? [[User:Kev|Kev]] ([[User talk:Kev|talk]]) 23:11, 31 May 2024 (UTC)

Dangerous to whom is relevant. Yes, cars are less dangerous to the driver than bicycles and pedestrians, but that is because the main threat to bicyclists and pedestrians is cars. If you count victim deaths in addition to perpetrator deaths, then cars are the least safe vehicle. [[Special:Contributions/172.71.99.30|172.71.99.30]] 01:56, 1 June 2024 (UTC)Regret

Are scooters really more convenient than bikes or does Randall just think they are cooler? Please discuss. [[Special:Contributions/172.69.58.128|172.69.58.128]] 04:17, 1 June 2024 (UTC)
:The convenience of scooters probably includes their relative storability/carryability between uses, easier to hop on and off (also you might get away with scootering down long corridors where a bike would be (more) frowned upon) and takes less maintenance. (Electric ones do have the additional fuss of charging (and ICE ones needing fuel/being more disruptively noisy), but hard to tell whether Randall means shove-along or motorised in any way). Probably he doesn't mean mopeds (also known as 'scooters', in some contexts), but they also may be considered like bicycles but marginally more convenient (when fuelled/serviced) and commensurately a little bit more dangerous (though I'd argue further over to near full-on-motorbikes, myself). But it's a lot of speculation either way. [[Special:Contributions/172.71.242.28|172.71.242.28]] 11:32, 1 June 2024 (UTC)

I would expect that unicycles are more dangerous than bicycles. For that matter, bicycles are probably more dangerous than tricycles, and those would be slightly less safe than quadcycles. There we probably hit the optimal point, but I doubt anyone has done an in dept study into this matter. Just for starters: a double blind test would not be particularly safe for the riders. [[Special:Contributions/172.71.98.101|172.71.98.101]] 07:00, 1 June 2024 (UTC)
:When you have learnt how to ride a bike, a tricycle can actually be ''harder'' to ride, due to having to unlearn your existing bicycling instincts. To turn (or not to turn) on a bicycle involves at least 'microleaning', as well as steering, which can actually work against the steering geometry on a tricyle (perhaps a quadricycle is less effected, as one reverts to car-like behaviour/has to account for uneven road surfaces even more differently). Before you have the bike-riding skills (especially on front-wheel-pedal kids' trikes, which have yet more things going on than proper road-cycling tricycles) you generally don't get into the wrong mode of balance where you actually veer off exactly the opposite way to what you intend and maybe start to lift one of the rear wheels off the ground, or more.
:For similar reasons, it's much better to have a completely new passenger ('stoker') on a tandem who is not a cyclist than one who is (but it being their first time on a tandem). The 'steersman' does not need too much complication from their "luggage" instinctively leaning on their own (or unconsciously tugging left/right on their fixed-handlebars), at least until they've practiced their coordination so that there's just the right amount of weight redistribution at the right time to make the whole machine correctly metastable for the circumstances. A non-cyclist can generally be asked to "just sit there and pedal" and not, despite being told, throw themselves around in various ways not related to the (synchronised with the steersman) pedal-revs. [[Special:Contributions/172.71.242.28|172.71.242.28]] 11:32, 1 June 2024 (UTC)

There's a "jetpack" missing to the right of hot air ballons... [[Special:Contributions/108.162.221.61|108.162.221.61]] 10:26, 1 June 2024 (UTC)

2939: Complexity Analysis

2024-05-30T08:13:32Z

172.71.242.28: /* Explanation */

{{comic
| number = 2939
| date = May 29, 2024
| title = Complexity Analysis
| image = complexity_analysis_2x.png
| imagesize = 430x361px
| noexpand = true
| titletext = PERPETUALLY OPTIMISTIC CASE: Early in the execution, our research group makes a breakthrough on proving P=NP.
}}

==Explanation==
{{incomplete|Created by a PERPETUALLY OPTIMISTIC BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
[[Cueball]] is teaching about an algorithm's complexity. The average-case runtime of the algorithm is written as O(n log n), in {{w|Big O notation}}, expressing the asymptotic runtime of the algorithm as the number of inputs to it grows larger and larger. This is an error by [[Randall]] (or Cueball), as Big-O notation represents only the worst-case, not average-case time complexity.

The "best case" for an algorithm is typically its runtime when its inputs have optimal values and it runs in as little time as possible. The joke here is that not only does it run quicker than this by being terminated early because it's 'unnecessary', but its runtime appears to be an hour shorter still because of an act of Congress changing {{w|daylight saving time}}, giving it an end time (in local time) that is an hour less than it would otherwise have been. Potentially this would result in an end time that is less than its start time, and therefore an apparently ''negative'' 'runtime'. Daylight saving time is a [[:Category:Daylight saving time|recurrent theme]] on xkcd, and it is clear that Randall is not a fan, so Congress making surprise DST changes is another way for Randall to mock the concept.

The "worst case" refers to the movie {{w|Groundhog Day (movie)|Groundhog Day}}, in which the same events occur over and over in a sort of time loop. (This movie has been referenced before in [[1076|1076: Groundhog Day]].) If the hardware running the algorithm is stuck in this kind of loop that resets to a previous time before it ever gets finished, then the algorithm would never terminate. This gives rise to a philosophical question as to whether the whole world is reset after every day, or just the town where the movie takes place. If it is just the town, and you can still connect to their hardware from outside, then from that perspective the algorithm would appear to be taking an interminably long time to run. If the whole world resets, since people (aside from the movie's main character) do not experience the reset of the day, it would only appear to take as long as it did on the final day when it successfully completed.

This may be an indirect reference to the {{w|halting problem}}, a famous problem in computer science. The halting problem is {{w|undecidable}}, meaning that there is no general algorithm that can tell whether a given algorithm will halt.

The title text refers to perhaps an even more famous problem in computer science: {{w|P versus NP problem|P versus NP}}. This asks whether every problem whose solution can be quickly verified (in nondeterministic polynomial time, {{w|NP_(complexity)|NP}}) can also be quickly solved (in polynomial time, {{w|polynomial time|P}}). The P-versus-NP problem is one of the seven {{w|Millennium Prize Problems}}, and as such has a $1 million prize for its solution. Presumably, the problem discussed here is in NP, so if P=NP, its worst-case runtime would be some polynomial ''O(nk)''. However, P vs. NP is a Millennium Prize Problem for a reason, and most computer scientists expect that P != NP, so hoping for a breakthrough in proving P=NP is "perpetually optimistic". This may be a reference to {{w|Optimism bias}} and the {{w|Planning fallacy}}, whereby people tend to assume that the most favourable outcome will be the most likely.

==Transcript==
:[Cueball is holding a presentation pointer stick, pointing to a table behind him that towers above him. The table has a heading above it and then two columns and three rows. the first column is slim and the second much broader.]
:Results of algorithm complexity analysis:
:{| class="wikitable"
|Average case
|O(n log n)
|-
|Best case
|Algorithm turns out to be unnecessary and is halted, then Congress enacts surprise daylight saving time and we gain an hour
|-
|Worst case
|Town in which hardware is located enters a Groundhog Day scenario, algorithm never terminates
|}

{{comic discussion}}

[[Category:Charts]]
[[Category:Comics featuring Cueball]]
[[Category:Programming]]
[[Category:Daylight saving time]]
[[Category:Fiction]]

Talk:74: Su Doku

2024-05-10T09:51:58Z

172.71.242.28:

If that puzzle is 4 (i.e. 2x2) domains of 1x1 cells or 1 domain of 4x4 cells then it's actually an impossible puzzle. Sudoku grids for 'n' symbols (ignoring some very interesting variants) need to be of n² cells in total with n cells in each direction, composed of n 'domains', each of n cells so as to contain ''one and only one'' of each symbol in use. That's 81 cells in a traditional 1-9 digit 9x9 format, being 3x3 array of 3x3 individual cells in typical <strike>Sudokus</strike> <strike>Sudokii</strike> <strike>Sudoka</strike> puzzles, but can be irregularly domained instead as long as the domains still have nine cells. In a 12-digit that's often 3x4 cells in each domain, arrayed 4x3 (or 4x3 arrayed 3x4) to make a 12x12 full grid but can be 2x6 6x2s (or <=>) or of irregular, but still equally-sized, subdivisions. ("Killer" variations typically augment the row, column and domain parities with a 'fourth dimension' of ''unequally''-sized irregular domains (no larger than any other domain, containing a ''maximum'' of one of each digit, but possibly zero of some) labelled as having a stated sum total within (more than or equal to m*(m-1)/2 for m cells in that given sum-zone, assuming the lowest digit is 1, and less than or equal to (n*(n-1)/2)-((n-m)*(n-m-1)/2), if n digits are being used as unique symbols throughout the whole grid), but that's generally in leiu of ''all'' pre-existing clue digits, using Kakuro-like calculations to break ground on the puzzle's answer.)

Realistically, therefore, the comic must be 1x2 domains of 2x1 cells. Or the other way round. Although it's not obvious from the line-weighting which it might be. As each subdivision is the same as the row-grouping or column-grouping it could effectively be just a 'simpler' puzzle that abandons or considers redundant domains ''other'' than the basic rows and columns, given that each possible domain-type would be congruent with one or other of the two implicit groupings. However, it definitely could ''not'' be an "X" variant of the puzzle type (repetition dissallowed across the major diagonals, as well as across rows and columns), otherwise it reverts to being impossible again...

However, none of what I've just said is particularly entertaining, so please feel free to ignore it and instead try the following Unary Sudoku.... (Hint: its major diagonals are also valid domains to solve!)

□

[[Special:Contributions/178.98.31.27|178.98.31.27]] 15:07, 24 June 2013 (UTC)

==Major update==
I think we even can discus PIxPI grids here at discussion page, but the explain should be simple as possible. Please help on that bad remaining language. AND: Since Randall is from the US we have AE (American English) here.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 21:19, 1 July 2013 (UTC)
:And Su Doku is only 1 to 9 - thanks for help--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:14, 9 July 2013 (UTC)

I think this description of the alt text is a little inadequate. The reason the puzzle is 'medium difficulty' is because any given puzzle in a binary sudoku is going to be essentially the same... you'll either have a one and a zero, two ones, or two zeroes since those are the only ways to ensure a unique solution. So all puzzles have the same difficulty which is why it is 'medium'.--[[Special:Contributions/108.162.238.162|108.162.238.162]] 08:28, 28 July 2015 (UTC)

:I don't follow your sentence "you'll either have a one and a zero, two ones, or two zeroes", please can you try and explain more clearly. Essentially though, there are two possible solutions to the puzzle:
:{| class="wikitable"
|0
|1
| rowspan="2" style="background-color: white; border-top:solid 1px white;border-bottom:solid 1px white;" |or alternatively
|1
|0
|-
|1
|0
|0
|1
|}
:The only thing which can make the difficultly change is how many cells are pre-filled. If 0 are filled then either both solutions are correct, or it is impossible to know which solution is correct. If 1 cell is filled, then it is easy to complete the rest of the grid. If 2 are filled, then it is even easier to complete, and easier again with 3 filled. --[[User:Pudder|Pudder]] ([[User talk:Pudder|talk]]) 11:01, 28 July 2015 (UTC)

huh
never seen this one before--[[Special:Contributions/172.71.242.28|172.71.242.28]] 09:51, 10 May 2024 (UTC)

Talk:1471: Gut Fauna

2024-03-21T17:09:54Z

172.71.242.28: ...last summary meant to say "...*is* the same...", I think. Token edit. *blushes*

I think this comic also contains a pun on [https://en.wikipedia.org/wiki/Macrobiotic_diet macrobiotics]. Esp. the wording "out of balance" seems to be a reference to esoteric speech. [[User:Knob creek|Knob creek]] ([[User talk:Knob creek|talk]]) 09:13, 9 January 2015 (UTC)

In fairy tales (most notably in little red riding hood), the wolf swallows whole its (human) victims. The comic depics an inversion of roles. Do you think it's worth adding this observation in the explanation? {{unsigned ip|188.114.99.18}}

:That's what I took it to mean too, the two options being he swallows the wolf or the wolf swallows him. [[Special:Contributions/141.101.98.159|141.101.98.159]] 12:35, 9 January 2015 (UTC)

Another pun might be on the name of a restaurant in Seattle: [[http://www.ethanstowellrestaurants.com/locations/how-to-cook-a-wolf/ How to Cook a Wolf]] [[User:Araucaria|Araucaria]] ([[User talk:Araucaria|talk]]) 15:53, 9 January 2015 (UTC)
:That's so extremely obscure that thinking it intended is difficult. - Equinox [[Special:Contributions/199.27.128.117|199.27.128.117]] 16:59, 9 January 2015 (UTC)

;Is a citation really needed?

I think that requiring a citation for the lethality of administering a wolf via the mouth or rectum may be going just a bit too far? Reference in the [http://www.explainxkcd.com/wiki/index.php?title=1471:_Gut_Fauna&diff=82345&oldid=82344 Change history] [[User:Pmw57|Pmw57]] ([[User talk:Pmw57|talk]]) 10:25, 9 January 2015 (UTC)

: I assume that this is a humorous comment, similar to the citation needed tags in the What-if articles. [[Special:Contributions/141.101.98.237|141.101.98.237]] 12:04, 9 January 2015 (UTC)

::Good point, could be a joking reference to [http://www.explainxkcd.com/wiki/index.php?title=285 xkcd #285] {{unsigned ip|173.245.52.138}}

I know an old lady who swallowed a... [[Special:Contributions/108.162.249.237|108.162.249.237]] 13:45, 9 January 2015 (UTC)
: https://www.youtube.com/watch?v=KiESiO6tLM8 --[[User:RenniePet|RenniePet]] ([[User talk:RenniePet|talk]]) 19:54, 9 January 2015 (UTC)
: The strange thing is, I am absolutely certain their is an old Chinese fairy tale but I can't google it at all! It's about a man who swallows a fly and then he has to swallow a frog and then a snake and eventually a (human) hunter. But the latter doesn't kick up a fuss so there the problem ends. What's weird is that I couldn't google that fairy tale at all.[[Special:Contributions/141.101.64.5|141.101.64.5]] 10:21, 30 March 2015 (UTC)

Is Ponytail ''actually'' a Doctor? If you take the lessone from what can be done in [https://xkcd.com/699/ 699 - Trimester], and buy a labcoat... [[User:RedHillian|RedHillian]] ([[User talk:RedHillian|talk]]) 01:55, 10 January 2015 (UTC)

"animals are never found in the human digestive system; all known cases of animals in a human digestive system are causes of disease.)" Technically, couldn't it also be the result of one's choice of food? Admittedly a temporary state of affairs, but there are certainly dishes involving live food. [[User:Squornshellous Beta|Squornshellous Beta]] ([[User talk:Squornshellous Beta|talk]]) 07:55, 10 January 2015 (UTC)
: Or for pleasure? [[Special:Contributions/108.162.238.191|108.162.238.191]] 17:35, 10 January 2015 (UTC)
:: Point(s) taken. I'll make a minor change to fix [[User:Djbrasier|Djbrasier]] ([[User talk:Djbrasier|talk]]) 00:08, 12 January 2015 (UTC)
:: Actually, I can't get the wording right. Happy to have someone rewrite it to include temporary residence of live organisms in the case of some foods and (apocryphal) tales of gerbilling, etc. [[User:Djbrasier|Djbrasier]] ([[User talk:Djbrasier|talk]]) 00:11, 12 January 2015 (UTC)

Poor dog. [[Special:Contributions/108.162.246.231|108.162.246.231]] 06:25, 10 January 2015 (UTC)

I'm having a really, really hard time imagining what kind of discussion Randall was involved in that led to his thought processes ending up producing the result we see here. --[[User:RenniePet|RenniePet]] ([[User talk:RenniePet|talk]]) 02:58, 11 January 2015 (UTC)
: Funny nickname in this context, RenniePet. (btw. Does "inwolved" make any sense here?) [[Special:Contributions/141.101.104.22|141.101.104.22]] 10:44, 12 January 2015 (UTC)
: ...My take is that the lycan (spelled this way: a werewolf) would probably also eat fawns (deer) - helping to balance forest overpopulation. If we take "gut" and "fawna" back through German/English, we might have "good" and "to make or be glad" another sense of fawning (perhaps alluding here to self-care, but also especially when applied to dogs). The werewolf is historically described as a shapeshifter so it seems appropriate to shift then to lichen (same pronunciation) which is a symbiotic organism (yet another thematic connection) consisting of an alga and fungus; blue-green algae is often taken to balance out the gut. A dry lichen (the etymology of this word means 'to lick', appropriate for the canine, which is also likely to be dry) will absorb many, many times its weight in water, and lichens (which are often found in forests) are important for soil (a word sometimes used to refer to fecal matter). A final connection is in a medical condition known as "guttate" (having drops, as in a glass of water) lichen"...though I might have chased this rabbit a bit far. [[User:Elvenivle|Elvenivle]] ([[User talk:Elvenivle|talk]])

“However, either way would prove both physically impossible and potentially lethal.” ... Potentially lethal? You mean, there is actually a chance to survive swallowing a wolf? --[[Special:Contributions/108.162.215.94|108.162.215.94]] 22:42, 11 January 2015 (UTC)

According to the research of the Grimm Brothers, Randall has it all wrong. Wolves do not live in the stomach of people, people live in the stomachs of Wolves. For example, a big bad wolf might told to take two humans and call the doctor in the morning. ((Dan Loeb - 9:24pm ET, 11 January 2015))

how about "hungry like a wolf" and a reference to him missing a good appetite ? transfer of the wolf could thus mean re-vigorating his appetite.((SK - 16:01 CET, Jan 16 January 2015))

"normal humans shouldn't have large animals living inside them with the exception of some parasites such as Helminths or Cestoda" -- was that intended to mean what it says? Normal humans shouldn't have helminths or cestoda in them either! I know people can become infected with parasites, and there are anecdotes of jockeys swallowing a tapeworm egg in order to lose weight for an important race, but I would not have thought you should be recommending the practice. [[Special:Contributions/162.158.38.154|162.158.38.154]] 22:11, 10 March 2019 (UTC)
: On a similar note, "all known cases of [...] are causes of disease" isn't completely true ''if'' you take into account experimental helminthic therapy. The gist is that there are worms that don't cause significant disease, and you get them intentionally to, uh, (hand wringing) calm down the immune system. --[[Special:Contributions/172.71.210.206|172.71.210.206]] 16:35, 24 January 2023 (UTC)

The wolf would obvously have to be declawed and possibley detoothed to avoid shredding the persons throat and stomach.(I love how serous this disscusion about this imaginary sinario thats purpously ridiculous, I love it. This is the kind of things people should be arguing about - like if the worlds bannanas can fit in the worlds churches - :) ) [[User:Apollo11|Apollo11]] ([[User talk:Apollo11|talk]]) 15:35, 21 March 2024 (UTC)
:Hmmm... A year's-worth of bananas? 105 million tonnes, apparently. Cavendish are 1.19 g/cm3 (call it 1, for trivial conversion or allowing imperfect packing), so 105 million litres of space needed. Some random person off the internet says 38 ''million'' churches (really, well, I'll take it for now), so that'd be about 2.75 litres of bananas averaged out so... can you fit a cube 14cm per side in each church? Easily!.
:But not sure about the church number's reality. How about assuming 2.38 billion Christians (another claimed figure, but seems not actually unreasonable and is slightly under other estimates), they ''each'' might get 44 millilitres of boxed-banana and take the box (roughly an inch cubed) in with them. Easy enough.
:Might be marginally more difficult if 'active churchgoers' are a fraction of the presumed christians. I'm not sure if I'm counted as one (I don't think I'm down as a Jedi... or Omnian), but I really haven't been in a church for ''any'' reason for years... probably was someone's wedding. But there seems to generally be room in any church that I would recognise to have the active congregation bring along multiple (even tens of?) 'banana-boxes' chuck 'em in a corner, then still do all the stuff any given congregation would do ''without'' the jumble of boxed bananas sitting over between the font and the door to the vestry, or wherever
:Yes, I would say (if I haven't messed it up any more badly than I initially did) it ''can'' be done. It ''shall'' be done! ...spread the word, someone with access to both bananas and bishops can get it organised, and I might even check out how my local church deals with it. [[Special:Contributions/172.69.194.60|172.69.194.60]] 16:40, 21 March 2024 (UTC)

2906: Earth

2024-03-15T21:50:47Z

172.71.242.28: /* The "pale blue" dot */ Slight improvements. And small comment/note, should anybody be so inclined to dig around.

{{comic
| number = 2906
| date = March 13, 2024
| title = Earth
| image = earth_2x.png
| imagesize = 364x472px
| noexpand = true
| titletext = Just think of all the countless petty squabbles and misunderstandings, of all the fervent hatreds, over so insignificant a thing as the direction and duration of a rocket engine firing.
}}

==Explanation==
{{incomplete|Created by a HAUNTED MOON - Do NOT delete this tag too soon.}}

[[File:Pale Blue Dot.png|200px|right|thumb|The ''Pale Blue Dot'' image from Voyager 1. Earth is the "pale blue dot" halfway up the rightmost color band.]]
At first sight, this appears to be the famous {{w|Carl Sagan}} commentary, upon the ''{{w|Pale Blue Dot}}'' image of Earth, a picture taken by the {{w|Voyager 1 probe}} in 1990 (at that time 6 billion kilometers away) but having been transmitted back to Earth to be appreciated as one of the most iconic 'photos of Earth from space', along with ''{{w|Earthrise}}'' and ''{{w|The Blue Marble}}''. Sagan's written, and later spoken, words evoke how the lives of all of us are somehow confined to barely more than a single pixel's-worth of existence upon an already zoomed-in view of space.

From the caption, however, it appears that 'Carl' is not looking at an image. Instead it is a spacecraft window. The minute apparent size of the Earth is as a result of the spacecraft being very far from Earth. This is an unintended consequence of an attempt to deorbit from {{w|low Earth orbit}} (i.e. not more than 2000 kilometers from the Earth's surface, from which the Earth should still mostly fill any view that points towards it). Rather than transitioning from LEO into a re-entry trajectory, somehow the vessel and crew have been sent into a ''much'' higher-reaching orbit, if not into a solar or extra-solar trajectory. And it is apparently Carl's fault. The speech is thus not an inward view of where we all are, but an outward look at somewhere that all the crew (unwillingly, and against all recent expectations) are ''not''.


The title text continues with the traditional tone of the speech, only to become an implicit attempt to claim that it wasn't quite as drastic an error as it actually seems to have been.

The very same words (or as far as they go), but in the more traditional situation of an informative lecture, were previously used in [[1246: Pale Blue Dot]].

=== The scale of the error ===

The comic's distance from Earth is unlikely to be anywhere near that of Voyager 1, and would not be being seen portrayed by the same 1500mm high-resolution narrow-angle camera as took the alluded-to image. The apparent size of Earth, compared with Carl at his window, would depend a lot on the actual 'camera' geometry/position for the scene. For comparison, however, the Earth seen from the Moon is slightly under four times the diameter of the Moon as seen from the Earth, or perhaps nearly the size of a clenched fist, held at arm's length. This implies (unless the scene uses a particularly wide-angled lens, close to Carl and the window) that the vessel's position is now ''significantly'' beyond the orbit of the Moon.

The ''absence'' of a clearly visible Moon, which would have a near-identical phase to the illuminated Earth and could easily be the second brightest object in the scene, is therefore best explained by it being no more than a sub-pixel object, indistinguishable from the surrounding darkness of space, somewhere within thirty Earth diameters (and thus [[2205: Types of Approximation|approximately]], in this image, pixels) of the visible Earth. This could include being sufficiently in conjunction/opposition to Earth to blend in, or be obscured by it.

The general lack of other visible stars, etc, would be explained by the exposure being tuned to not wash out the illuminated internal view, and not being set up for useful astronomical shots, though may then set another range of useful limits on what magnitude of reflected sunlight must still arrive from Earth in order to remain visible.

=== The "pale blue" dot ===
Although it might initially look like a white dot, the comic truly has used a pale blue color for the dot that represents Earth, with the color used in the "2x" version of the image seeming to be 0xBDCFF4.

This can be interpreted as predominently a very light gray, with an extra hint of green and a bigger hint of blue. Or redefined as an {{w|HSL and HSV|HSV}} triplet of of 220.4 (a greenish-blue hue), 22.5% (relatively unsaturated) and 95.7% (very bright), all consistent with how the sunlit side of an Earthlike world would look with large oceans, vast swathes of terrestrial vegetation and atmospheric clouds) if necessarily abstracted down to a very limited number of pixels.

Looking at {{w|File:Pale_Blue_Dot.png|an actual example of the 'original'}}, seems to give a possible RGB of 0x95B39E (which gives: hue of 138, i.e. a 'bluish-green'; saturation level of 16.8%; brightness value of 70.2%), which is of course also consistent with the above assumptions about Earth. But all such images are of course ultiamtely derived as a composite of the data from [https://pds-rings.seti.org/voyager/iss/inst_cat_na1.html#filters eight separate 'filters'], which don't neatly fit into the {{w|RGB color model}}, and always subject to various kinds of post-processing and image conversion techniques.

==Transcript==
:[Carl Sagan (drawn Cueball like but with flat hair) is standing in front of a black screen with a tiny pale blue dot in the middle. He indicates the screen by holding out his right hand palm up towards the screen. He is speaking to someone off-panel, who replies from a star burst on the right edge of the panel.]
:Carl: Look again at that dot. That's home. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives...
:Carl: On a mote of dust suspended in a sunbeam.
:Off-panel voice: We '''''know,''''' Carl.

:[Caption below the panel:]
:Carl Sagan was '''''not''''' making us feel better about how badly he'd messed up the low Earth orbit reentry burn.

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Comics featuring real people]]
[[Category:Space]]

1037: Umwelt

2024-03-14T18:41:27Z

172.71.242.28: Explained/assumed in the following paragraph, already.

{{comic
| number = 1037
| date = April 1, 2012
| title = Umwelt
| image = umwelt_the_void.jpg
| titletext = Umwelt is the idea that because their senses pick up on different things, different animals in the same ecosystem actually live in very different worlds. Everything about you shapes the world you inhabit--from your ideology to your glasses prescription to your web browser.}}
{{TOC}}
*To view your personal version of the comic, visit the {{xkcd|1037|original comic}}.

==Explanation==
This was the third [[:Category:April fools' comics|April fools' comic]] released by [[Randall]]. The previous fools comic was [[880: Headache]] from Friday April 1st 2011. The next was [[1193: Externalities]] released on Monday April 1st 2013.

An {{w|Umwelt}}, as the title text explains, is the idea that one's entire way of thinking is dependent on their surroundings. Thus, this {{w|April Fools}} comic changes based on the browser, location, or referrer. Thus, what the viewer is viewing the comic on, where they live, or where they came from determines which comic they actually see. As a result, there are actually multiple comics that went up on April Fools' Day, although only one is seen.
(The term 'Umwelt,' as mentioned in the comic, refers to the semiotic theories of Jakob von Uexküll and Thomas A. Sebeok)

Information about how the wide variety of data was collected and credit for the viewers who contributed can be found [https://www.reddit.com/r/xkcd/comments/rnst4/april_fools_xkcd_changing_comic/ here].

===The Void===
[[File:umwelt the void.jpg]]

If the device or browser you are using does not support Javascript, you will simply see a static image of a white swirl on a dark background.

Possible reference to The Ring (https://imgur.com/wlGmm), as though to suggest that using an alternative browser is dismal and horrific.

Davean (xkcd's sysadmin): "[This] comic isn't available everywhere and it can come up i[n] some situation[s] only for recognized browsers."

Browser: Alternative Browser

===Aurora===
[[File:umwelt aurora.png|800px]]

One could interpret that since Megan didn't go out and therefore missed seeing the {{w|Aurora}} (northern lights), Cueball in his [[1350:_Lorenz#Knit_Cap_Girl|knit cap]] lied about it. That way, she wouldn't have felt sad that she missed out. Another interpretation could be that he decides that since she did not even bother to go outside to see such a spectacular sight he will not tell her about it. And yet another could be that he did not think it was interesting.

Cueball could possibly also be red-green colorblind, seeing the green aurorae as grey "clouds". This would serve as an example for the theme of the comic, as a non-colorblind person and a colorblind person seeing the same color would perceive it differently, one seeing it as its true color, and the other seeing it without the shade of color they cannot see. If this is the case, then it would be a reference to umwelt, as Cueball would be living in a world where the auroras do not reach his location.

In real life, [https://www.huffpost.com/entry/the-northern-lights-dont-look-anything-like-they-do-in-photos_n_5500a4d9e4b0e62d0dd4f9bb aurorae are usually seen as grey/white clouds] to the naked eye, as our eyes cannot perceive the "greener" colors as well in the dark.

This image changed based on the size of the browser window including different panels at different sizes.

Locations: Canada, Boston, Indiana, Maine, New York, Ohio, Oregon, Texas, Minnesota, Norway, Denmark, France, Ireland, Rhode Island, Mississippi, Seoul (Safari), London (on Firefox). Also in Virginia, but using Ohio in the first panel; in Maryland, but using Canada in the first panel; in Marion, Illinois, but using Canada in the first panel along with the phrase "as far south as us" in the first panel, and in Utah, also using the phrase "as far south as us", same with Colombia, Spain and Georgia.

In [[1302: Year in Review]] a possibly different Megan has a completely different approach to the chance of seeing northern lights, as that was the only event she was looking forward to in 2013, and it failed. If this is the same Megan, perhaps she learned that there actually were northern lights in her area from another source, and so desperately wanted to have another chance to see them.

===Snake===
[[File:umwelt snake composite 1024.png]]
[[:File:umwelt snake composite.png|Full size]]

The joke here is the extreme length of snakes. The world's longest living snake is the {{w|reticulated python}}, the longest ever measuring over 22 feet (6.95 meters). The blue and orange circles refer to the hit game {{w|Portal}}.
There is also a reference to the book "The Little Prince" in the second panel, where there is a large bulge in the snake that looks like an elephant. The Little Prince starts out by mentioning a drawing that the author made when he was six that showed an elephant inside a snake.

Also, the number and content of the panels changes depending on the size of your browser window.

This image changed based on the size of the browser window including different panels at different sizes.

Specific AltText for this image: Umwelt is the idea that because their senses pick up on different things, different animals in the same ecosystem actually live in very different worlds. Everything about you shapes the world you inhabit -from your ideology to your glasses prescription to your browser window size.

Location: Texas (on Chrome Version 33.0.1750.154 m), New Jersey, California (on Chrome Version 39.0.2171.95), Maryland, Massachusetts (Safari for iOS, Chrome version 49.0.2623.112), Connecticut (Safari for iOS, Chrome Version 73.0.3683.103, Internet Explorer, and Microsoft Edge), Virginia (on Chrome), Michigan (Firefox v46.0.1), Penang (Chrome Version 65.0.3325.162), London (Microsoft Edge), Germany (on Opera One (version: 106.0.4998.70)).

===Black Hat===
[[File:umwelt tortoise 1024.png]]
[[:File:umwelt tortoise.png|Full size]]

Cueball as an analyst attempts to psychoanalyze [[Black Hat|Black Hat's]] [[72: Classhole|classhole]] tendencies. Cueball's quote and the whole setup is a direct reference to the movie {{w|Blade Runner}} (1982) and Black Hat is taking the Voight-Kampff test which is used to identify replicants from real humans.

Black Hat's reason for not helping the tortoise is that ''it '''knows''' what it did'' and thus in Black Hat's world view it deserves being turned over. The final part of the joke is that when zooming out it turns out that there is a tortoise behind Black Hat and he has actually already turned it over for what it did.

Location: Seems to appear mostly in "other countries" — those without location-specific comics.

===Too Quiet===
[[File:umwelt too quiet 1024.png]]
[[:File:umwelt too quiet.png|Full size]]

A reference to {{w|Jurassic Park (film)|Jurassic Park}} which has been [[87: Velociraptors|constantly]] [[135: Substitute|referred]] [[1110: Click and Drag|to]] [[155: Search History|before]] [[758: Raptor Fences|in]] this comic.

Also referencing the film {{w|2 Fast 2 Furious|2 Fast 2 Furious}}, an entertaining, yet intellectually unprovoking sequel in a popular film franchise, which is aimed at teenagers and young adults, prompting the blunt response from the stickman. The fact that Steve would use such a cliché {{w|2000s (decade)|noughties}} movie term in such an intense moment, and the subsequent curse, is the joke in this comic.

Location: short version — iPhone 5c Safari browser in Texas, iPhone 5 Chrome Browser in Minnesota, long version - Google Chrome browser in Indiana, Windows 8 Laptop

===Pond===
[[File:umwelt pond mobile.png]][[File:umwelt pond wide.png]]

Two different versions showed, the narrower version for mobile devices.

Location: The Netherlands and various other countries.

===Galaxies===
[[File:umwelt galaxies 1024.jpg]]
[[:File:umwelt galaxies.jpg|Full size]]

Megan is distracted from her conversation with [[Cueball]] by realizing that the space behind his head, from her vantage point, contains millions of galaxies. This is similar to an [https://nssdc.gsfc.nasa.gov/image/astro/hst_deep_field.jpg incredible photograph] taken by the Hubble Telescope, in which a tiny dark area of space in fact contained numerous galaxies.

The title text is an imaginative leap from this scenario: that the galaxies would be up to no good once Cueball is turned away from them. This is presumably a reference to [https://www.mariowiki.com/boo Boo], an enemy from certain Mario games who moves toward Mario only when Mario is facing away from Boo.

This comic was only reported once... the intended environmental context is a mystery.

Location: unknown

===xkcd Gold===
[[File:umwelt xkcd gold.png]]

This is probably a reference to the 4chan Gold Account, an implementation on 4chan that does not actually exist, and is usually used to trick newcomers into revealing their credit card numbers. The joke is that "Gold Account" users can supposedly block other users from viewing images they have posted. The fifth panel is probably a reference to Beecock, a notorious set of shocker images. 4chan's moderators have been known to give out "beecock bans" or "/z/ bans" to particularly annoying users, which redirect the user to a page containing beecock and the text "OH NO THE BOARD IS GONE".

Referrer: 4chan

===Yo Mama===
[[File:umwelt dog ballast.png]]

Possible reference to Kurt Vonnegut Jr.'s "{{w|Harrison Bergeron}}."

The joke is that people's different experiences shape how they perceive the world in that the people who live in this world would perceive the joke as funny, while people in our world would not get it. This is the idea of umwelt mentioned at the top of the context where different individuals perceive the world differently.

Refer: Facebook

===Reddit===
[[File:umwelt reddit.png]]

Reference to referencing, because Reddit, as a referring site, likes references to its referencing in its references.

This comic also features recursive imagery similar to [[688: Self-Description]] where the second panel embeds the entire comic within itself. (Except, conspicuously, the arrow indicating that it is "You" in the first panel.)

One of the browser tabs visible in the center panel is {{w|Elk}} on Wikipedia.

Referrer: Reddit

===Buns and Hot dogs===
[[File:umwelt somethingawful.jpg]]

This is a reference to the question "Why do hot dogs come in packages of 6 while buns come in packages of 8?"

Another, more sexual reference to this question can be found in [[1641: Hot Dogs]].

Referrer: SomethingAwful, Questionable Content, & MetaFilter

===Twitter===
[[File:umwelt twitter.jpg]]

A summary of the "content" typically found on Twitter.

In the tweet feed, there are three tweets about some podcast on the top, followed by the tweet containing link they clicked on to get to the comic, tweets about Rob Delaney, unspecified passive-aggressive tweets, and a tweet from {{w|Horse_ebooks}} retweeted by one of the users the reader follows.

On the left, the topmost dialog, with profile information, shows that the user has posted 1,302 tweets, but only follows 171 people and has even fewer followers, at a measly 48. This is marked with a sad face, implying that the user wants more followers.

Below that is the "who to follow" dialog, which is written up as consisting of "assholes".

Below that is the "trending tags" dialog for the United States. It is full of tags about word games, tags about misogyny, and tags about Justin Bieber.

Below that is an unidentified dialog full of "stuff your eyes automatically ignore". And finally, on the bottom is the background color, which is "a really pleasant blue".

Referrer: Twitter

===Wikipedia===
[[File:umwelt wikipedia wide.jpg]]
[[File:umwelt wikipedia mobile.png]]

The term {{w|Mile High Club}} (or MHC) is a slang term applied collectively to individuals who have had sexual intercourse while on board an aircraft. Randall says that reading the news articles on it has distracted him from making that comic.

Two different versions shown, the narrower version (the single panel with all the text) for mobile devices.

Referrer: Wikipedia

===Google Chrome===
[[File:umwelt chrome1.jpg]]

{{w|Sergey Brin}} (born August 21, 1973) is an American computer scientist and Internet entrepreneur who, with Larry Page, co-founded Google, one of the most profitable Internet companies. As of 2013, his personal wealth was estimated to be $24.4 billion. Randall makes the joke that as the founder of Google, Brin's permission would be needed to use Google Chrome. Because there are millions of people who use Google, it is likely that at least some of the time Brin would be asleep, thus he would need to be woken.

Browser: Chrome

===Chrome/Firefox===
[[File:umwelt chrome2.png]]

Mozilla {{w|Firefox}} is a free and open-source web browser developed for Windows, OS X, and Linux, with a mobile version for Android and iOS, by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Cueball is complaining about {{w|Google Chrome}}, to which [[Ponytail]] replies that there is an {{w|add-on}} that fixes what he is complaining about. When questioned, she replies that the add-on is Firefox, which isn't an add-on at all and is instead a different browser.

Browser: Chrome

===Google Chrome-2===
[[File:umwelt chrome3.png]]

This panel references Google Chrome's error screen, which shows a puzzle piece. The comic humorously implies that Chrome is looking for that piece. When completing jigsaw puzzles, a common strategy is to figure out where the pieces must be from their geometry rather than from the picture they create. In this case, the text suggests that Chrome believes the puzzle piece connects to the pieces which form one of the corners of the puzzle, which may seem impossible because any piece that links up to a corner would usually have at least one flat edge, which this piece has none. However, more complicated puzzles have complex shapes and are not always simply approximate squares with tabs and blanks.

Browser: Chrome or silk on desktop view

===Mozilla Firefox Private Browsing===
[[File:umwelt firefox incognito.png]]

Another reference to crashing web browsers.
Firefox shows the history when it crashes.
Browser: Firefox (Incognito only?)

===Internet Explorer===
[[File:umwelt ie.png]]

This is yet another reference to crashing web browsers but instead, Internet Explorer has given up. It could be because there are too many sessions, they are shutting it down, or maybe it was too lazy to do anything.

Browser: Internet Explorer

===Maxthon===
[[File:umwelt maxthon.png]]

Browser: Maxthon

===Netscape Navigator===
[[File:umwelt netscape womanoctopus.png]]

[[File:umwelt netscape man.png]]

{{w|Netscape Navigator}} was a web browser popular in the 1990s.

Browser: Netscape

===Rockmelt===
[[File:umwelt rockmelt.png]]

{{w|Rockmelt}} is a social-media-based browser.

Reference to the gospel song {{w|Longing for Old Virginia: Their Complete Victor Recordings (1934)|"There's no hiding place down here" by The Carter Family}}, later covered by Stephen Stills.

:I run to the rock just to hide my face
:And the rocks cried out, no hiding place
:There's no hiding place down here

It may additionally be a reference to the ''Babylon 5'' episode "And the Rock Cried Out, No Hiding Place," which featured the song.

Browser: Rockmelt

===Plugin Disabled===
[[File:umwelt plugin disabled.png]]

When the Google Chrome web browser does not have the required software (called a plug-in) to display a web page's content, it displays a puzzle piece icon and an error message. In this case, Chrome informs the user that the content is impossible to display.

Browser: Plugin (?) Disabled, Safari Desktop

===Corporate Networks===
[[File:umwelt corporate general.png]]
[[File:umwelt corporate amazon chrome.png]]
[[File:umwelt corporate amazon firefox.png]]
[[File:umwelt corporate amazon other.png]]
[[File:umwelt corporate google chrome.png]]
[[File:umwelt corporate microsoft chrome.png]]
[[File:umwelt corporate microsoft firefox.png]]
[[File:umwelt corporate microsoft other.png]]
[[File:umwelt corporate nytimes chrome.png]]
[[File:umwelt corporate nytimes other.png]]

These error messages appear if the user is on a network owned by one of the corporations noted. The error message includes a warning against speaking on the company's behalf.

ISP: Corporate networks of Amazon, Google, Microsoft, NY Times

===Military===
[[File:umwelt military.png]]

[[Cueball]] assumes that anyone using a military network has an important job like watching for incoming missiles. He includes a thank-you to the user for their military service.

ISP: Military networks

===T-Mobile===
[[File:umwelt tmobile.png]]

Reference to T-Mobile's distinguishing feature (at the time it was written) of weaker coverage, in relation to other major providers.

ISP: T-Mobile

===Verizon and AT&T===
[[File:umwelt verizon.png]]

[[File:umwelt att.png]]

Reference to Verizon and AT&T's scandals/controversy regarding implementation of bandwidth caps.

ISP: Verizon and AT&T

===France===
[[File:umwelt france.jpg]]

A common joke about France is that the nation does not win wars. This originated from France's annexation by Germany during World War II, and America's late entry into the war, which is sometimes portrayed humorously as a case of America 'saving' Europe, in this joke particularly France (the role of the French resistance is usually not mentioned), leading to a common American joke at the expense of France's military prowess [https://www.albinoblacksheep.com/text/victories.html][https://politicalhumor.about.com/library/images/blpic-frenchmilitaryvictories.htm][https://politicalhumor.about.com/library/jokes/bljokefrenchmilitaryhistory.htm]. When France did not form part of the coalition that invaded Iraq in 2003, aligning with the many countries that condemned U.S. action, the joke was revived.

A Google search of "French Military Victories" + 'I'm feeling lucky' used to direct to "did you mean: french military defeats" (due to a {{w|Google bomb}}). Cueball is trying to show this to his friend, who is French. However, his joke backfires, as his friend immediately points out that the stereotype of France not having military victories is undercut by the fact that one of the most innovative military commanders in history, Napoleon, was French by citizenship (though Italian/Corsican by culture, as the French annexed Corsica a few months before his birth to an Italian noble family), and in fact conquered much of Europe.

Following the theme of umwelt, the comic highlights the two characters' differing perspectives: The American thinks that France is a military failure, while the Frenchman thinks of Napoleon.

The last line of the comic further implies that Cueball is not as smart as he thinks he is in regards to anything French, as he mispronounces the French loan word "{{w|Touché (fencing)|touché}}".

Locations: France & Quebec

===Germany===
[[File:umwelt germany.png]]

This comic references the {{w|Berlin airlift#The start of the Berlin Airlift|Berlin Airlift}}, a relief measure for citizens in West Berlin (surrounded by East Germany) instituted by the Western Allies after World War II. In reality, the Western Allies flew a grand total of 500,000 tons of food over the Soviet blockade in planes. Randall puts a twist on this event by making it more fun: dropping supplies from a grand chairlift. The play on words is that "chairlift" rhymes with "airlift" and thus makes an easy substitution. The chair force is also a name that other service branches use to make fun of the air force.

Location: Germany

===Israel===
[[File:umwelt israel.png]]

Translation: Mom, I met a great guy! But he's not Jewish. ...Wait, what do you mean "neither are we"? I'm completely confused.

A reference to the multiple use of the word Jewish to denote both a {{w|Judaism|religious group}} and a {{w|Jews|nationality/ethnicity}}, as well as the stereotype of Jews holding low opinions of interfaith marriage.

A side note: Randall accidentally drew an apostrophe instead of the similar-looking Hebrew letter י everywhere that letter should appear.

Location: Israel

===Carnot Cycle===
[[File:umwelt japan.png]]

A pun on "cycle"; a "{{w|Carnot cycle}}" is a thermodynamic cycle (e.g. refrigeration). Its efficiency depends on the temperature of the hot and cold 'reservoirs' in which it is operating. The icon on the side of the motorcycle resembles a [https://upload.wikimedia.org/wikipedia/commons/thumb/0/06/Carnot_cycle_p-V_diagram.svg/1000px-Carnot_cycle_p-V_diagram.svg.png graph of the Carnot cycle.]

Location: Japan

===UK===
[[File:umwelt uk.jpg]]

He worded this as though to imply that the UK is a state of the U.S., and an unimportant one at that, which pokes fun at the UK, creating a paradox (sort of).

Location: UK

===Blizzard===
[[File:umwelt disasters blizzard.png]]

This comic is aimed at the debate over whether earthquakes or blizzards are harsher conditions to live under. In keeping with the theme of umwelt, the comic demonstrates that the two people perceive the world in two different ways due to their different experiences: The Californian perceives a mild earthquake and a severe blizzard, while the Northeasterner perceives a severe earthquake and a mild blizzard.

For each particular location in which this displayed, the state name was substituted in the third panel.

Locations: Alabama, Boston, Chicago, Dallas, Georgia, Halifax, Illinois, Michigan, Minnesota, Missouri, the Northeast, Ohio, Oklahoma, Ottawa, Pennsylvania, Philadelphia, Texas, Toronto, Tennessee, New York, Wisconsin

===Tornado===
[[File:umwelt disasters tornado.png]]

This comic is aimed at the debate over whether earthquakes or tornadoes are harsher conditions to live under. In keeping with the theme of umwelt, the comic demonstrates that the two people perceive the world in two different ways due to their different experiences: The California perceives a mild earthquake and a severe tornado, while the Midwesterner perceives a severe earthquake and a mild tornado. It's similar to [[#Blizzard|Blizzard]].

For each location this displayed in the state name was substituted in the third panel.

Locations: Alabama, Dallas, Illinois, Georgia, The Midwest, Missouri, Ohio, Oklahoma, Ottawa, Tennessee, Texas (and Virginia, but it used Ohio in the third panel)

Tornadoes are a [[:Category:Tornadoes|recurring subject]] on xkcd. The picture used in [[1754: Tornado Safety Tips]] very reminiscent of the one from this version of Umwelt. [[Category:Tornadoes]]

===Hurricane===
[[File:umwelt disasters hurricane.png]]

This comic is aimed at the debate over whether earthquakes or hurricanes are harsher conditions to live under. In keeping with the theme of umwelt, the comic demonstrates that the two people perceive the world in two different ways due to their different experiences: The Californian perceives a mild earthquake and a severe hurricane, while the Easterner perceives a severe earthquake and a mild hurricane. It's similar to [[#Blizzard|Blizzard]] and [[#Tornado|Tornado]].

For each location this displayed in the state name was substituted in the third panel.

Locations: D.C, Florida, Georgia, Houston, Miami, New Jersey, North Carolina, South Carolina, Virginia

===Lake Diver Killer===
[[File:umwelt lake diver.png]]

This comic shows a news reporter standing in front of a lake. She is reporting on a serial killer who targets divers. As more divers are sent in to investigate and/or search for bodies, more divers go missing, the implication being that they were also murdered. The more likely reason is the lake itself is dangerous for diving, and the divers probably drowned from natural hazards (undercurrents, entanglement, running out of oxygen in tanks, etc.) instead of a malicious assailant. Also, this is a sort of loop, where each time a diver gets killed, the investigative team goes and investigates, causing more divers to get killed, causing more deaths, and so on.

Location: Bay Areas, Metro Detroit, Vermont showed an image specifically referencing Lake Champlain

===Lincoln Memorial===
[[File:umwelt lincoln memorial.png]]

{{w|Abraham Lincoln}}, the 16th president of the United States of America, was not an entity composed wholly of nanobots that attempted to consume the entire nation to then be imprisoned within the {{w|Lincoln Memorial}}.{{Citation needed}} The inscription references the epitaph at the actual Lincoln Memorial, which reads "In this temple, as in the hearts of the people for whom he saved the union, the memory of Abraham Lincoln is enshrined forever".

Locations: Illinois & Washington, D.C.

===Helicopter Hunting===
[[File:umwelt helicoptor.png]]

In Alaska, governments and individuals have {{w|Wolf hunting#North America 2|shot wolves en masse from helicopters}} in an attempt to artificially inflate populations of game, such as moose and caribou, to make hunting them easier. This is opposed by many, as the game populations are not endangered (thus, this threatens ecological balance); wolves are a small threat to livestock in North America; most of the wolf body —including meat and bones— goes wasted as they are sought mainly for their pelts.

Location: Alaska

===Newspaper===
[[File:umwelt life scientists.png]][[File:umwelt life rit.png]][[File:umwelt life umass.png]]

Creating new life has long been a well understood process, in a lab or otherwise.

This comic is likely a reference to the title text of [[983: Privacy]]

Location: Various

Specific versions appeared for RIT and UMass Amherst

===Robot Paul Revere===
[[File:umwelt paul revere.png]]

Combination of the legend of {{w|Paul Revere#"Midnight Ride"|Paul Revere}} and a computer bit that differentiates between two situations by indicating a zero or a one.

Location: Boston

===Counting Cards===

All four colleges in this series are in Massachusetts and, being similar, in pairs, rival each other to some extent (Harvard-MIT, and Smith-Wellesley). The comic contains a reference to the {{w|MIT Blackjack Team}}, which entered popular culture via the {{w|21 (2008 film)|film 21}}, and a possible reference to Orwell's book '1984' and/or {{w|Chain of Command (Star Trek: The Next Generation)|popular homage to it via Star Trek}}: "There are four lights."[https://www.youtube.com/watch?v=ChYIm6MW39k]

Bonus: The thought-gears in panel 3 are spinning against each other.

Location: Harvard

[[File:umwelt counting cards harvard.png]]

Location: MIT

[[File:umwelt counting cards mit.png]]

"Course 15s" at MIT are the business major students, often mocked for taking a less-rigorous program. The different interpretation for why the MIT students could not count cards compared to Harvard may be a reference to the theme of umwelt.

Location: Smith

[[File:umwelt counting cards smith.png]]

Location: Wellesley

[[File:umwelt counting cards wellesley.png]]

Both Wellesley and Smith are all-women colleges in Massachusetts.

===Giant Box Trap===
[[File:umwelt box trap.png]]

Randall got his undergrad in Physics at the {{w|Christopher Newport University}}, and was scheduled to return shortly to give a talk. The "Trible" figure on the right is Paul Trible, the then-president of CNU. This comic depicts a classic trap, where an upside-down box is propped up with a stick. When the stick is removed, by pulling a string, the box falls and traps whatever is underneath it. Aside from the joke of the obvious trap, there's also the fact that the president would not be responsible for revoking unearned diplomas.

Location: Christopher Newport University

===Chemo Support===
[[File:umwelt chemo.jpg]]

[[Cueball]] has shaved his head in support of people going through {{w|chemotherapy}} but, as he is always depicted as a stick figure with no hair, no one can tell.

Randall's now-wife was diagnosed with breast cancer, and apparently DFCI is where they've been spending much of their time.

Location: Dana-Farber Cancer Institute

===Reviews===
[[File:reviews.png]]

The previous strip appears twice when using [[wikipedia:Tor (anonymity network)|Tor]].

Browser: Any using Tor, xkcd API (JSON, RSS, Atom), w3m, and reports of seeing it on a Kindle Fire HD; also happens if visiting with a browser that does not support JavaScript (such as Firefox with NoScript)

===Nothing===

[[File:Umwelt blank.jpg]]

In some cases, the comic can be completely absent, with only the top and bottom buttons visible. On most newer browsers, this is caused by a script loading part of the comic via a HTTP request while the rest of the webpage is delivered over HTTPS. This is referred to as [https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content mixed content] and is blocked on modern browsers by default due to security concerns. This version of the comic is therefore likely not an intended outcome, but rather an unintended consequence of how this comic was implemented. [https://mastodon.social/@chromakode/109531309722997557 It was been confirmed] that this was not intentional and will be fixed. Since this comic's release, all devices viewing it have returned two rows of navigation buttons if near IP address 69.114.249.104.

The http(s) issue seems to have been fixed.

==Transcript==
:'''[This section only covers the first three comics. For the transcript of the entire comic, go to the [[1037: Umwelt/Transcript|full transcript page]].]'''

===The Void===
:[An epic void with a bright light shining right on you.]

===Aurora===
:[Cueball heading out past Megan comfortably sitting in front of a desk.]
:Cueball: Apparently there's a solar flare that's causing some Great Aurorae. CBC says they may even be visible here! Wanna drive out to see?
:Megan: Hockey's on.
:Cueball: Ok. Later.

:[An expansive, marvelous image of emerald green northern lights, floating down through the sky.]

:Megan: See anything?
:Cueball: No, just clouds.
:Megan: Not surprised.

===Aurora-US===
:[Cueball heading out past Megan comfortably sitting in front of a desk.]
:Cueball: Apparently there's a solar storm causing northern lights over Canada. CNN say they might even be visible {Options: "As Far South As Us", "Here in Boston", "Maine", "Ohio", "Oregon", "New York"}! Wanna drive out to see?
:Megan: It's cold out.
:Cueball: Ok. Later.

:[An expansive, marvelous image of emerald green northern lights, floating down through the sky.]

:Megan: See anything?
:Cueball: No, just clouds.
:Megan: Not surprised.

===Snake===
:[Two people standing next to each other. Megan is holding the head end of a snake. Depending on the width of your browser, the snake is: three frames, the third of which has a little bit of a bump; the first frame has a human-size bump, the second has a third person looking at the snake, and the third has the snake going though two Portals; a squirrel and the human-size bump in the first frame, a ring next to the third person in the second frame, and Beret Guy riding the snake in front of the portal; or The squirrel, a fourth person within the snake being coiled, and the human bump in the first frame, the ring, a fifth person in love, and the third person in the second frame, Beret Guy and the portal in the third frame, and the same two people in the fourth frame.]

:Megan: I found a snake, but then I forgot to stop.

:'''[For the transcript of the entire comic, go to the [[1037: Umwelt/Transcript|full transcript page]].]'''

==Trivia==
* The Reddit user [https://www.reddit.com/user/SomePostMan SomePostMan] created a [https://www.reddit.com/r/xkcd/comments/t6wmh/all_umwelt_1037_comics_in_two_imgur_albums/ post] that collected all of the Umwelt comics and added explanations. Much of his information is now included in this wiki.
* At the start of the [https://xkcd.com/1037/info.0.json official transcript of this comic], the writer added a note alluding to its extreme length:
:: <nowiki>[[Two people...]]</nowiki>
:: ((..wait.. <scrolls through a listing of everything> oh goddammit Randall. Thanks a bunch, dude. I better get a raise for typing out all this))
:: [[Two people standing next to each other.
* This comic was released on April 1 even though that was [[:Category:Sunday comics|a Sunday]] (only the third comic to be released on a Sunday). But it was only due to the April Fools' joke, as it did replace the comic that would have been scheduled for Monday, April 2nd. The next comic, [[1038: Fountain]], was first released on Wednesday, April 4th. This was the first that could be different for different readers.
* This comic displays the previous comic, Reviews (1036), when you try to view it on uni.xkcd.com.

{{comic discussion}}

[[Category:Comics with color]]
[[Category:April fools' comics]]
[[Category:Dynamic comics]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Black Hat]]
[[Category:Comics featuring Knit Cap]]
[[Category:Comics featuring Beret Guy]]
[[Category:Comics featuring Danish]]
[[Category:Comics featuring Hairy]]
[[Category:Philosophy]]
[[Category:Penis]]
[[Category:Video games]]
[[Category:Velociraptors]]
[[Category:Your Mom]]
[[Category:Puns]]
[[Category:Squirrels]]
[[Category:Comics with blood]]
[[Category:Characters with hats]]

285: Wikipedian Protester

2024-02-28T12:46:26Z

172.71.242.28: Undo revision 336021 by 172.69.194.182 (talk) Silly, unnecessary

{{comic
| number = 285
| date = July 4, 2007
| title = Wikipedian Protester
| image = wikipedian_protester.png
| titletext = SEMI-PROTECT THE CONSTITUTION
}}

==Explanation==
[[Cueball]] holds up a sign reading "[Citation needed]" during a political speech. The sign text is based on the {{w|Wikipedia:Citation needed|Wikipedia template}} that can be placed next to statements that need citations, (that look like this[citation needed]) usually because of questionable validity. Cueball is using this template to challenge the politician's speech, as political speakers often throw out claims having dubious or no factual basis. This comic was posted on Independence Day in 2007.

The title text represents an alternative sign the protester could be holding. It is a pun on popular phrase "protect the Constitution", which urges politicians to pass and enforce laws in a way that preserves the rules and rights set down by the {{w|Constitution of the United States|U.S. constitution}}. "Semi-protect" is a reference to the {{w|Wikipedia:Semi-protection policy|Wikipedia semi-protection policy}}, which is used to prevent important articles from being edited anonymously or by new users. Semi-protection on an article is shown by displaying this lock [[File:semi-protection-lock.png|12px]] on the top right of an article. Constitutional amendments are proposed by Congress, which isn't anonymous, meaning that in effect, all articles of the Constitution are technically already semi-protected. Funnily enough, the "{{w|Constitution}}" and "{{w|Constitution of the United States}}" articles on Wikipedia are now semi-protected due to excessive vandalism.

==Transcript==
:[A man with dark flat hair is standing at a podium. He is speaking to a crowd while standing behind a lectern. The lectern has a microphone on the top and sports an American flag in color on the side. He holds an arm on the lectern and the other arm is held up in front of him with a finger pointing upwards. There are four red stars on the side of the podium below him and behind him something that could be high curtains. There is an empty gap between the podium and the first people in the crowd followed by a stick with a red top, which indicates a fence to keep the crowd at a distance from the podium. After the fence there is a large crowd of people listening, most of them only partly drawn, only a few has hair. Three signs can be seen above the heads of the crowd, but they are all empty white signs. Except in the middle of the crowd, where Cueball has been raised above the rest of the crowd. He is holding a large sign up over his head in both hands. The sign has a blue text in black square brackets:]
:<big>[Citation needed]</big>

==Trivia==
* The ''[[what if? (blog)|what if?]]'' blog and this wiki use the {{Template|Citation needed}} template as a joke after statements that are blatantly obvious. For example, "The light from the Sun illuminates the Earth.{{Citation needed}}". On this wiki, the template has been used in [[:Category:Pages using the "citation needed" template|{{PAGESINCAT:Pages using the "citation needed" template}} pages]] and clicking on it leads to this comic's explanation.
* Randall {{w|User_talk:Xkcd#http://xkcd.com/c285.html|re-licensed this comic}} under [https://creativecommons.org/licenses/by/2.5/ the CC-BY 2.5 license] so that it could be {{w|File:Webcomic xkcd - Wikipedian protester.png|used on Wikipedia}}. By default, xkcd comics are licensed under [https://creativecommons.org/licenses/by-nc/2.5/ CC-BY-NC 2.5], which is considered too restrictive for Wikimedia content. On Wikipedia, this comic was featured as the {{w|Template:POTD/2018-11-23|picture of the day}} on November 23, 2018 and is used in the "{{w|Citation needed}}" article, the "{{w|Wikipedia:Citation needed}}" information page, and the "{{w|Wikipedia:Why Wikipedia cannot claim the Earth is not flat}}" essay.
* The template in this comic used to be [https://web.archive.org/web/20211215010112/https://store.xkcd.com/products/citation-needed-sticker-pack available as a sticker pack] in the xkcd store before it was [[Store|shut down]].
* xkcd fans have made [https://blog.xkcd.com/2007/10/01/the-meetup/comment-page-2/#:~:text=There%20were%20several%20gallant%20protesters%20insisting%20that%20all%20assertions%20be%20fully%20backed%2Dup. "Citation needed" signs in real life] as a joke.

{{comic discussion}}

[[Category:CC-BY-SA comics]]
[[Category:Comics featuring Cueball]]
[[Category:Comics with color]]
[[Category:Comics with xkcd store products]]
[[Category:Multiple Cueballs]]
[[Category:Politics]]
[[Category:Public speaking]]
[[Category:Wikipedia]]

2882: Net Rotations

2024-01-18T09:51:37Z

172.71.242.28: /* Explanation */

{{comic
| number = 2882
| date = January 17, 2024
| title = Net Rotations
| image = net_rotations_2x.png
| imagesize = 318x477px
| noexpand = true
| titletext = For decades I've been working off the accumulated rotation from one long afternoon on a merry-go-round when I was eight.
}}

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

This comic may refer to a thing that some people with {{w|OCD}} do, which is to spin around to get rid of "net rotations," hence the title of this comic. [[Cueball]] (perhaps representing [[Randall]]?) takes this one step beyond the typical person with OCD - he calculates the net rotations each day and spins around at the end of the day to cancel this out. In this case, he would be spinning left 17 rotations to return to zero.

The offered reason for the necessity to do this is a physics joke: the reference to spacetime and to one's "worldline" has to do with relativity and the {{w|Einstein-Cartan theory}}, which is an extension of Einstein's general relativity. The theory suggests a coupling between the intrinsic spin of elementary particles (fermions) and the torsion of spacetime, and this comic appears to humorously extrapolate this idea to even supermolecular structures like a human, telling readers to "cancel out your accumulated turns at the end of each day to avoid worldline torsion", where in reality, it is highly unlikely the spin on such a large scale would cause any torsion in anyone's worldline, or their path traced by a particle or observer in spacetime.

A mobile device with position/orientation sensing might be able to keep track of one's net rotations, eliminating the need for calculations. One would need only to do one's spinning while monitoring the device to see when it returned to zero.

The caption at the bottom of the comic suggests that it is another one of Randall’s [[Category:Tips|tips]], and says that it is healthy and necessary/highly recommended to do this. However, most people don’t, and most people are still ok.{{Citation needed}} In fact, xkcd's own characters are perfectly ok with [[162: Angular Momentum|accumulating net rotations]] and [[2679: Quantified Self|similar topological excesses]].

Unlikely but could also be influenced by a 1966 novel, The Revolving Boy by Gertrude Friedberg, if Randall has read it, whose protagonist suffered from being out of true depending on the number of turns he was forced to make in his everyday life. No spoiler as to why that was important to the plot.

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

:[Cueball is standing on one leg in front of a whiteboard with his arms crossed, thinking to himself. There are circular curves around Cueball indicating rotary motion. The whiteboard contains two vertical helix-like curves crossing over each other at multiple points and other notes shown as rows of illegible scribbles, the bottom one of which is circled. There is a thought bubble over Cueball.]
:Cueball (thinking): ...and three lefts for going down the stairwell at work, two rights from cloverleaf interchanges, minus one for the Earth's rotation...
:Cueball (thinking): Okay, that's a net of 17 right.

:[Caption below the comic:]
:Spacetime health tip: Remember to cancel out your accumulated turns at the end of each day to avoid worldline torsion.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Astronomy]]
[[Category:Physics]]
[[Category:Tips]]

Talk:928: Mimic Octopus

2024-01-12T14:21:28Z

172.71.242.28:

How does the mimic octopus manage to mimic multiple fish? Does it split it's own body up or something? '''[[User:Davidy22|Davidy22]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 13:30, 8 January 2013 (UTC)
:"When under attack, some octopuses can perform arm autotomy, in a similar manner to the way skinks and other lizards detach their tails. The crawling arm serves as a distraction to would-be predators. Such severed arms remain sensitive to stimuli and move away from unpleasant sensations.[23]"[http://en.wikipedia.org/wiki/Octopus#Defense] {{unsigned ip|173.245.48.113}}
::Fine, but in the SCUBA diver depiction, would it really need to rip parts out of itself to mimic bubbles? I don't think that that is quite necessary. {{unsigned ip|108.162.241.131}}
:::It could also hypothetically mimic bubbles by *actually blowing bubbles*. (No word on how it does this.) [[Special:Contributions/108.162.216.30|108.162.216.30]] 02:36, 2 January 2016 (UTC)Anon
::::Simple: This is a 2D {{w|Tomography|cut-out}} of the octopus mimicking the fishes or the scuba '''in 3D'''. It assumes a very complex figure, so that in the cut-out we only see the 2D pictures above. {{unsigned ip|162.158.83.144}}
:i always thought it was just a point of humour in the absurdity that a single octopus could mimic a group of fish -- just the same as it is for a rather small creature to mimic a full-size submarine [[User:Eurydice|Eurydice]] ([[User talk:Eurydice|talk]]) 17:37, 31 December 2021 (UTC)

For the record, octopus is from the Greek ὀκτάπους, a compound of ὀκτά (eight) and πούς (foot); πούς is a third declension masculine noun, whose plural is πόδες. Therefore, the etymologically correct plural of octopus should be octopodes, not (as Orson Scott Card suggests) octopoda, since πούς is not a neuter.
:Actually, it would be "octopuses", as it showed up ''after'' the regularization of English plurals to a final -s. As the video in the explanation explains, someone in the Victorian Grammarian Era "realized" it was "Latin" and pluralized it as such. This caught on and still haunts us to this day. "Octopdes" was coined around the same time by a more observant someone, who realized it was actually Greek. Personally, I avoid the whole trichotomy by saying "octopods". Unrelated etymologically, but has the same meaning and is unequivocally regular. Anonymous 08:08, 5 December 2013 (UTC)

Has anyone checked to see if the title text is true? Whether it is or not, this should be added to the description. [[Special:Contributions/108.162.212.18|108.162.212.18]] 11:53, 16 October 2015 (UTC)

What exactly is the pun here? [[Special:Contributions/199.27.133.78|199.27.133.78]] 00:53, 13 July 2016 (UTC)
:I don't know, either!?! "''Too many'' octopuses"??? {{unsigned ip|108.162.237.172}}

I had a very different impression of this comic when I first read it. I had never heard of a mimic octopus, and I assumed that the comic was making fun of calling a food dish "octopus" when it really wasn't. As in, a restaurant might feed you whatever they caught in a net and call it octopus, no matter how absurd it was. And if they ever did catch an octopus, they split it in two. Very cynical, but not nearly as cool. {{unsigned ip|108.162.246.115}}

I believe the third fish silhouette is actually a [https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjo1rua25jSAhWJ1IMKHU3XCUUQFggcMAA&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FGrouper&usg=AFQjCNGCdz2_bYFBDimJvFpFdG8sju4ljw&sig2=2D3silMR1tstIRSBihTGPA grouper], not a tuna. Sorry, Charlie.--[[Special:Contributions/162.158.74.237|162.158.74.237]] 03:26, 18 February 2017 (UTC)

I am not getting the "pun" of two mimic octopuses. Could anyone elaborate a little bit more? I never thought it as a pun, but rather implying that a mimic octopus, or any creature mirroring what it see, can only reveal its natural form by mimicking other mimic octopus. Though I think it makes sense, this is a bit different from other topics in xkcd, so I doubt it. 12:37, 22 August 2017 (UTC)

I agree with the above comment. Where's the "pun"? "Two Mimic Octopuses" doesn't sound like any other phrase. Maybe, at a stretch, "too many octopuses"? Moreover I don't think "… which is the pun of this comic" makes sense in any way. Comics don't all have puns, and comics with puns aren't limited to one. Perhaps it's a typo for "the point of this comic" or something? I'm going to remove that clause in 24 hours unless someone comes up with a convincing justification. [[User:AmbroseChapel|AmbroseChapel]] ([[User talk:AmbroseChapel|talk]]) 02:05, 13 September 2017 (UTC)

I am surprised that nobody mentioned the very similar mock identification charts such as [http://i.imgur.com/4ufx1.jpg this one] or [https://imgur.com/gallery/O5jlE7U that one]. Given the silhoutetted style of Randall's drawing, I'm pretty sure he had one or both in mind. [[Special:Contributions/141.101.105.204|141.101.105.204]] 15:36, 19 October 2017 (UTC)

The (visual) pun is that the one image out of all of them that actually looks like it could be an octopus, is actually not a (single) octopus. See the identification charts in the comment above for similar concept. [[Special:Contributions/172.69.62.148|172.69.62.148]] 20:38, 11 October 2019 (UTC)

Wait, they’re all mimic octopuses?

Always has been.

Is it possible that the second “unknown” figure is a coral grouper? (Link to image examples:(https://reefguide.org/indopac/pixhtml/coralgrouper9.html) It resembles an outline of some smaller examples. {{unsigned ip|172.69.195.112|04:43, 12 January 2024}}