explain xkcd - User contributions [en]

2666: Universe Price Tiers

2022-08-31T23:36:00Z

172.68.66.63:

{{comic
| number = 2666
| date = August 31, 2022
| title = Universe Price Tiers
| image = universe_price_tiers.png
| titletext = In Universe Pro®™ the laws of physics remain unchanged under time reversal, to maintain backward compatibility.
}}

==Explanation==
{{incomplete|Created by a SOWN WIND - Explained the main point, more details needed. Please change this comment when editing the page . Do NOT delete this tag too soon.}}
Philosophers have posed many questions in trying to understand the nature of the universe. Some of these have become well-known in popular culture; while some are deliberately open-ended, several others are presented as a choice between two or more options, and are assumed to have a single answer, the debate being about which is correct. In this comic, Randall proposes that the answers to these questions are instead not fixed, but vary according to a tiered subscription model, as seen in many business pricing schemes, particularly in software. In this model, the no-cost tier gets you a universe experience of a lower quality, while at higher tiers better options are available for a cost - for example in the highest tier the processes of aging and death are "Opt-in" rather than "Mandatory". It is not clear from the comic who is supposed to be paying these subscription fees, or whose experience of the universe is supposed to be affected.

The universe does not have a subscription model.{{citation needed}}

The Cosmic speed limit refers to the speed of light, which rounds to 300,000 kilometers per second.
{| class="wikitable"
|-
! !! Universe Lite™ !! Universe Standard® !! Universe Pro®™!!Explanation
|-
! Price
| Free || $14.95/month || $49.95/month
|-
! Ads
| Yes || Yes || No
|-
! Number of angels that can dance on the head of a pin
| 4 || 64 || 4,096
|-
! Free will or determinism
| Determinism || Free will || Free will
|-
! Cosmic speed limit
| 65mph || 300,000 km/s || Unlimited || The Cosmic speed limit refers to the speed of light, which rounds to 300,000 kilometers per second.
|-
! If a tree falls in a forest and there's no one there to hear...
| No sound || Simple beep || Full sound
|-
! Meaning of Life
| Unknowable || Uncertain || Clearly explained
|-
! Sound of one hand clapping
| [None] || [None] || ''Kazzap!''
|-
! Aging and death
| Mandatory || Mandatory || Opt-in
|-
! Does god play dice with the universe?
| Yes, and he cheats || Yes || No
|-
! Bad things...
| Happen to good people only || Happen to good and bad people || Don't happen
|-
! What happens to those who sow the wind
| Reap the whirlwind || Reap the whirlwind || Lots of crops everywhere
|}

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
{| class="wikitable"
|-
! !! Universe Lite™ !! Universe Standard® !! Universe Pro®™
|-
! Price
| Free || $14.95/month || $49.95/month
|-
! Ads
| Yes || Yes || No
|-
! Number of angels that can dance on the head of a pin
| 4 || 64 || 4,096
|-
! Free will or determinism
| Determinism || Free will || Free will
|-
! Cosmic speed limit
| 65mph || 300,000 km/s || Unlimited
|-
! If a tree falls in a forest and there's no one there to hear...
| No sound || Simple beep || Full sound
|-
! Meaning of Life
| Unknowable || Uncertain || Clearly explained
|-
! Sound of one hand clapping
| [None] || [None] || ''Kazzap!''
|-
! Aging and death
| Mandatory || Mandatory || Opt-in
|-
! Does god play dice with the universe?
| Yes, and he cheats || Yes || No
|-
! Bad things...
| Happen to good people only || Happen to good and bad people || Don't happen
|-
! What happens to those who sow the wind
| Reap the whirlwind || Reap the whirlwind || Lots of crops everywhere
|}
{{comic discussion}}

Talk:2143: Disk Usage

2022-06-09T11:10:15Z

172.68.66.63:

Seems fine to me!
[[Special:Contributions/172.69.62.40|172.69.62.40]] 20:54, 29 April 2019 (UTC)

Finally managed to contribute something again! It's 00:00 now, so I'll pick this up tomorrow if noone else has by then [[User:Gir|-- //gir.st/]] ([[User talk:Gir|talk]]) 21:56, 29 April 2019 (UTC)

I don't see what's alarming on ratio between good and bad photos. With digital cameras, actually choosing which photos are good takes more time than taking them in first place, so its often skipped. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 22:47, 29 April 2019 (UTC)

''Why do I feel so seen?!? Explain THAT!'' [[Special:Contributions/162.158.255.88|162.158.255.88]] 23:52, 29 April 2019 (UTC)

I think the menu option about "Download Cloud" in the title text is referring to the general concept of the cloud - in other words, downloading the "entire" cloud, not their own personal cloud storage! [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 00:36, 30 April 2019 (UTC)

Why is there an IP editor bolding random letters? [[User:RandomIsocahedron|RandomIsocahedron]] ([[User talk:RandomIsocahedron|talk]]) 02:13, 30 April 2019 (UTC)
:Look at the bolded letters. It's the guy who plasters 'soon the truth will be revealed' everywhere again. [[Special:Contributions/162.158.114.94|162.158.114.94]] 09:58, 30 April 2019 (UTC)
::I totally missed the message contained in the bold letters! I guess the truth was not revealed to me! [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 12:55, 30 April 2019 (UTC)

I've replaced the table with a description list, as per the [[explain xkcd:Editor FAQ#In_which_cases_are_tables_meaningful.2C_and_when_are_they_not.3F|Editor FAQ]]. It's obvious that one is the "item" and the other its "explanation." [[User:Gir|-- //gir.st/]] ([[User talk:Gir|talk]]) 17:04, 30 April 2019 (UTC)
:Thanks, I was just thinking I should probably do that :) [[User:Hawthorn|Hawthorn]] ([[User talk:Hawthorn|talk]]) 17:09, 30 April 2019 (UTC)

I think that "Optimize menu options" relates to the facility in older MS Office whereby it "hid" menu options that you hadn't used for "a while"; in theory "optimising" the menu and only showing you the options you used recently but in reality if you didn't use one of the programs for a long time you could open it and, so helpfully, find all your menu options gone. Not sure what to word in the explanation tho'. [[User:Nobby|Nobby]] ([[User talk:Nobby|talk]]) 07:15, 1 May 2019 (UTC)

FYI about the "Convert photos to text-only" part: Sometimes, when downloading pictures from internet the file is somehow saved as .txt and double click will successfully open as such (although it will look like gibberish as-is). If opened with a photo-viewing program that detects files with wrong extensions (IrfanView for example) the file can be renamed and opened as the photo file (.jpg usually) without loss of information. This can be used to hide photos not intended to be seen by other people.

"Convert photos to text-only" What about UUEncoding & UUDecoding? When newsgroups were much bigger, it was a popular way to transmit images. [[User:These Are Not The Comments You Are Looking For|These Are Not The Comments You Are Looking For]] ([[User talk:These Are Not The Comments You Are Looking For|talk]]) 04:36, 6 May 2019 (UTC)
:that's an encoding, not a conversion. (this section, imo, already has way too many things. i'd trim it down to 1) ascii-art and 2) captionbot-like services) [[User:Gir|-- //gir.st/]] ([[User talk:Gir|talk]]) 22:10, 7 May 2019 (UTC)

I mean he's got more free space than I do and I've got no videos, no documents, less than 5MB of photos, only about 1MB of which is actually on my computer's internal storage, and less than 2GB of applications, when you're using a laptop with 29.1GB max storage and no capability to format drives as internal for some reason or to increase said storage, you really start to hate system, and you wish that your internal storage could be replaced with that one SD you have that has more than 10 times the storage of your entire computer. 10:46, 26 June 2019 (UTC+12)

Randall has been known to use Mac computers (see comics referencing OS X "say" command, "Trash" folder, etc.) and the default MacOS disk storage display ( menu -> About This Mac -> Storage) is notorious for displaying huge wodges of used storage space with only the vague labels "System" or "Other", which can end up being infuriating when trying to clear out a hard drive. I'm pretty sure that's where this comic comes from. [[Special:Contributions/172.68.66.63|172.68.66.63]] 11:10, 9 June 2022 (UTC)

Talk:2625: Field Topology

2022-06-03T00:45:18Z

172.68.66.63:

First [[Special:Contributions/172.70.86.64|172.70.86.64]] 12:50, 27 May 2022 (UTC)

To me the topological fields look like toilet seats with three more or less seashells. --[[User:Gunterkoenigsmann|Gunterkoenigsmann]] ([[User talk:Gunterkoenigsmann|talk]]) 16:19, 29 May 2022 (UTC)
Why is football on the two-hole field? Where are the holes? I don't think the goal posts in American football introduce any since they're not closed. Maybe it's soccer? [[Special:Contributions/172.69.68.88|172.69.68.88]] 12:58, 27 May 2022 (UTC)

: I think it is because the goal posts extend into infinity and the topological definition of a hole: something you can draw a circle around that you cannot contract to a point. [the user placed a horizontal rule instead of a signature by accident.]

:Well, you might still be able to call them holes. They would be if they were fully rectangles. --[[User:BlackBeret|BlackBeret]] ([[User talk:BlackBeret|talk]]) 12:59, 27 May 2022 (UTC)

: Gridiron football's field contains two areas (the endzones) that can be thought of as not being part of the "normal" field of play, for lack of a better way of saying that pre-coffee. Association football likewise has the areas within the nets. [[User:Noëlle|Noëlle]] ([[User talk:Noëlle|talk]]) 13:05, 27 May 2022 (UTC)

: My immediate thoughts were also that football (soccer) and football (gridiron) are the same, or indeed the other way round. In both cases the closed hole (assuming not a Y-like vertical holder, but H-like as per rugby football) plays no more or less topological part. Threading through the hole from behind has no relevence in either, and in fact defining it as a region that is 'a special enclosed gap with meaning' (which doesn't really matter in the topology sense, just like golf would be a topologically hole-less surface and as a coffee-cup's inside 'dimple' doesn't count, just its handle-hole that makes it equivalent to a doughnut) actually counts for something in association football. [[Special:Contributions/172.70.162.155|172.70.162.155]] 13:32, 27 May 2022 (UTC)

:: It's not the space bounded by the goal that is the 'hole' - it's the goal post itself (or in the case of the high jump, it's the bar, not the space under it). The reason soccer doesn't have 'holes' where the goals are is that they're positioned on the edge of the playable area - you can't play around the bars, because as soon as you cross the goal line you're out of play. And it doesn't matter whether it's a Y-shaped or H-shaped goal - topologically, they both form one continuous 'hole'. [[Special:Contributions/172.70.91.80|172.70.91.80]] 13:37, 27 May 2022 (UTC)

::: I don't think that's the reason why soccer doesn't have holes. The goalposts in football are also outside the playable area, and so are the poles in volleyball. I think soccer is listed as zero-holes because soccer goals are typically not fixed to the field, and are instead separate objects that can be dragged around and removed from the field. On the other hand, the same is true of volleyball and badminton nets (and those nets contain many holes!) so the comic seems a bit inconsistent.[[Special:Contributions/172.70.175.146|172.70.175.146]] 14:05, 27 May 2022 (UTC)

:::: Speaking from a "football is soccer" nation (well, mostly, the exceptional subregions would argue that it's rugby) a soccer goal is typically ''not'' draggable around the field, but permanent (or a unit frame that has to be painstakingly hoisted out of the ground if you ''don't'' want them in your football stadium, when you repurpose it for other purposes) and it's only the optional net that gets added to the park's permanent goalposts for the official five-aside competition evening or day of the weekend. Draggable goalposts need a further level of intermediate organisation that goes beyond the typical "shipping container with windows cut in it (with shutters bolted over them) as a cheap changing room/officials' cabin" that might be found near the edge of the field but rarely even has as much as a corner flag left in them, between games".
:::: I presume that US 'football' posts are considered holes because they are an infinitely-tall window (even though the delineating poles only reach so high) that is a meaningful slice (where the goal is, you have to loop around it in mutually different unsimplifiable paths to reach the other side), but then that should make for ''two'' holes per end, if you count getting a field-goal and then returning round the sides (or vice-versa) as another valid surface-path.
:::: ...but, yeah, I can imagine the problem of definition (and cultural famiarity) here is going to produce more problems even than the understanding of topology. One of the less internationally-accepted comics, this. [[Special:Contributions/172.70.85.177|172.70.85.177]] 18:51, 27 May 2022 (UTC)
: O_O . Randall is united-statesian, so football means the thing where you tackle each other and hold the ball in your hands. I've never been into football, and I've always seen it with two large goal posts with a horizontal bar between them. The hole is formed under the horizontal bar. When I played football in computer games, you had to get the ball over the horizontal bar. After this, I'll search the web to see if the horizontal bar still exists. Regarding soccer, there aren't two holes because the nets are closed at the back. You cannot pass through the field structure by going through a goal: you bump into the net the ball bounces off of when a goal is made. So, Randall is considering soccer fields topologically equivalent to a plane (ignoring all the holes in the netting). [[Special:Contributions/172.70.114.229|172.70.114.229]] 14:58, 28 May 2022 (UTC)
: I looked up the goal thing and found that what I was imagining are called H-frame or H-style goal posts. Not the norm; the have two posts instead of one. I'm a weirdo that I thought they were what was up. But Randall could have been thinking of H-frame goals. [[Special:Contributions/172.70.230.63|172.70.230.63]] 15:04, 28 May 2022 (UTC)
::Many high school and amateur football fields still use H-frame goals. The resulting space can be used as a goal in some other sports. That does raise the question of why they didn't just have one field with lots of holes, and just plug the ones up that aren't needed for the sport being played. [[Special:Contributions/172.70.134.191|172.70.134.191]] 15:57, 28 May 2022 (UTC)
::H-frames are indeed the norm for American football in the everyday world. Only the professional and highest tier colleges use the more expensive Y-frames (which have the advantage of being harder for players to run into them). In fact, it is very common for the lower space of the H-frame to have the dimensions of a soccer goal, so that the field can be used for both association and gridiron football. If some Americans get go to the nearest park to play football, or go out on a weekend to see a local team (i.e. high school or community college) play, they are likely using H-frame goals. These are not the sorts of games that are televised, but there are thousands of such games played for every one on a fancy field with a Y-shaped goal. [[Special:Contributions/172.69.68.31|172.69.68.31]] 13:02, 31 May 2022 (UTC)

Tetherball, in many variants, does contain an obstruction -- the pole, which you're not allowed to touch. The Topology Department is getting tired of having to switch out the fields. [[User:Noëlle|Noëlle]] ([[User talk:Noëlle|talk]]) 13:05, 27 May 2022 (UTC)
:But you can surely jump over it, so it's topologically the same as a zero-height pole... [[Special:Contributions/172.70.162.155|172.70.162.155]] 13:32, 27 May 2022 (UTC)
:Tetherball does not have a *hole*. The pole, rope, and ball are just a stretched out bit of the continuous surface.

Croquet has six hoops and a peg. How does that make for nine holes? Is it including the opponents' two balls as holes? And if so, why aren't opposing players counted as holes in the other sports? [[Special:Contributions/172.70.91.80|172.70.91.80]] 13:26, 27 May 2022 (UTC)

: [https://en.wikipedia.org/wiki/Croquet#Nine-wicket] 'Nine-wicket croquet, sometimes called "backyard croquet", is played mainly in Canada and the United States, and is the game most recreational players in those countries call simply "croquet".' (Wikipedia) [[Special:Contributions/172.70.126.215|172.70.126.215]] 18:58, 27 May 2022 (UTC)

American football goals are Y-shaped. Rugby goals are H-shaped. Did... did Randall get those confused? Also, I fail to see how basketball and American football get two, croquet gets a bunch, but soccer gets zero. Aren't soccer goals (in-game at least) basically the same shape as croquet wickets, just waaaay bigger? Granted, I don't know anything about topology and I came to this wiki specifically cuz I'm dumb, so I'd love if someone could splain this all for me ;) --mezimm [[Special:Contributions/172.69.69.170|172.69.69.170]] 13:37, 27 May 2022 (UTC)
:The soccer goal has a net, so the ball can't go through it. Topologically it's just a wall (Randall seems to be ignoring all the tiny holes in netting, presumaby because they're smaller than the balls so they're insignificant to the sports). [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 14:10, 27 May 2022 (UTC)
::I agree with that explanation - the net is the only thing that makes the soccer field not to have holes. It should be included in the comic explanation.
::The hole for the volleyball only makes sense taking in account that the bottom of the net doesn't reach the floor, although this space is not used in the game.--[[User:Pere prlpz|Pere prlpz]] ([[User talk:Pere prlpz|talk]]) 14:18, 27 May 2022 (UTC)
::I agree about soccer; the explanation should be that soccer goals (with net) are topologically part of the plane. The same is true of ice hockey, even though you can travel "around" the net, it is topologically part of the field with no holes. As for (American) football, the topology only makes sense for H-shaped goals, which are more often seen on primary/secondary play fields than in higher level play. [[User:Aramisuvla|Aramisuvla]] ([[User talk:Aramisuvla|talk]]) 16:03, 27 May 2022 (UTC)
::Agreed. Soccer goals are shaped such that their bottoms connect smoothly to the ground in a single continuous piece. So they are topologically equivalent to the plane. This wouldn't be the case if not for the back part holding the net. That's unlike basketball hoops, which are actual holes. The holes in football must be referring to the H-shaped uprights that were standard until 1967 in professional leagues and are still seen in some high school fields and even a couple college fields. [[Special:Contributions/172.70.131.128|172.70.131.128]] 03:08, 28 May 2022 (UTC)
::EDIT: I should point out that the net actually has, like, hundreds of holes. But I think the net here is being treated as a continuous sheet. [[Special:Contributions/172.70.126.215|172.70.126.215]] 03:10, 28 May 2022 (UTC)
:::I mentioned all the little holes in the net in my comment that you're replying to. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:43, 28 May 2022 (UTC)

The group link pointing to group (mathematics) doesn't bear any relation with the sentence or the comic. I would remove the link.--[[User:Pere prlpz|Pere prlpz]] ([[User talk:Pere prlpz|talk]]) 14:18, 27 May 2022 (UTC)
: The joke seems important to me because their no consideration of the word 'field' being a math pun, and it raises the idea in readers. [[Special:Contributions/162.158.79.74|162.158.79.74]] 15:11, 28 May 2022 (UTC)
:When I first saw the comic title I assumed that part of the joke would be a pun on the word "field" being used for both sports and math. And even though the comic doesn't explicitly make this joke, I'll bet it inspired Randall. It's worth mentioning. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:43, 28 May 2022 (UTC)

In rugby (both League and Union) the goalposts are within the field of play: significant game activity takes place behind them. This is not the case with soccer. I have no clue what difference this makes topologically.{{unsigned ip|}}

I've been thinking about this classification system, and can't quite work out the baseline for it. I think we're supposed to assume that the whole 3d manifold is represented in a 2d 'field', or at least any path through the air flattened to an arbitrarily thin surface 'bulge' during topological rationalisation. But there are several possible field-of-play definitions we can be using...
* A single valid 'play' or traversal
** For ball-sports (or indeed other play-objects) this could be where the item can travel. But in this case I think almost 'all' codes of football are Type 1 (first of the topologies) as almost every football code deals with both 'goal' and 'endzone' (where valid) as the same as a hole (dimple) in golf... It goes into it and it might as well come out of it again, there's no continuation of play 'through the defined' space, and so the topological hole (the barrier defined the scoring membrane's edge) never comes into play. Unlike in Gridiron, where a touchdown doesn't even need the 'ball' to touch the ground, rugby (league and/or union, and possibly further derivatives) requires this and a player can fail to score a Try if (s)he passes bodily over the line but is unable to plant the ball (not allowed to throw/drop it) and I'd have to check what happens if the defending player(s) keeping them sufficiently off the ground (assuming that's done in an allowable fashion) returns the intended scorer back over the line via a circuitous route around /back-through the suspended goal-mouth (above the cross-bar, between the verticals)... They keep changing those kinds of technical rules, so I can't be sure of the current technicalities involved. Likewise, a volleyball or shuttlecock that passes under the net-top-edge is out of play, so it is really a Type 1 under this definition. (Might as well be a solid barrier, floor-to-top-height, rather than a thin bar or a partial net.) The basketball case is interesting. Although a dunk ends the play of the ball, I'm not sure if the path of a ball ''up'' through the hoop does not. In that circumstance I could believe it is a Type 3 case, but if that's a game-stopping thing then Type 1. Croquet is indeed a varying number of paths through (I ''think'') an unordered set of holes, or at least nothing to say that they can be taken out of order (or 'un-passed-through'), and you can't necessarily restrict a 'play' to one shot at a time if certain conditions allow you to play on, so dodging in and around all scoring zones defined by the hoops gives you something like.
** For player/competitor/participant movement, similarly passing under the bar is not valid for the High Jump. I don't think there's anything to stop such transitions upon the Parallel Bars, but it is much more a feature of the ''Uneven'' Parallel Bars, whereas from what I've seen of the sport, the even-variety tends to be topologically used much as the pommel-horse. Players of football (American variations certainly, rugby of course, proper football if you don't bother with the nets) are not restricted from passing through the scoring area (either way) on a circuitous path that may be off the field of play but isn't off the field ''of players''. For the Olympic Swimming, I'm not suring porpoising over and under the lane-delineations is a thing, so I would have said that (under this definition), it should be a number of entirely disconnected Type 1 'zones', with no valid movement between them at all. So far as I'm aware, there are no rules for/against croquet ''players'' passing through hoops (intentionally or perhaps because they severely annoyed an opponent) so maybe that stands in this case, too. Ditto for basketball, if hoisted. Although in both cases it may prevent the balls passing through immediately afterwards, without game-stoppage to resolve the issue.
* If it's a game's-worth of play, then the status of the basket in basketball (unlike the pocket in snooker/pool/some-versions-of-billards) might be defined by the topological-hole-that-is-the-physical-hole's-edge, rather than treat it as the old basket-with-bottom from which the precusor to the net-ring almost immediately evolved. And the same could be said about the suspended scoring-hole (whether supported as Y-post or an H-post, the lower limb(s) are merely physical necessities that play little part in the gameplay specifics except as a general hazard to avoid, it is the crossbar and verticals-to-infinity (and the infinity itself) that is the gap through which a circular path cannot be rationalised back to a point). For most of the rest (including the participant-paths, with there being nothing to stop the traversal of a footballer of whatever stripe jumping the cross-bar, but that may only mean something in the topology of some variations, as far as the game is concerned...) it seems meaningless. Even in an Aussie Rules field with four 'posts' per end, and probably more interest in whether jumping onto an opposing player is against the rules or indeed an entirely legitimate and expected tactic.
* The general arena-wide area is a further superset (perhaps with no additional complications, i.e. exactly congruent) of the field-of-play(er) definition. For coin-operated table-top games (foosball/table-football) the path from each goal may (additionally to any on-top topological loop-disconnections) force passage of the ball underneath and out into the new-play insertion spot. So add a couple more (unidirectional) paths, at least. Or six for a coin-operated pool/etc table, and I assume the Skeeball (not something I'm familar with, at least by that name) is defined that way already...
Sorry, I found I needed to say a lot more than I thought I did, so the first point (and sub-points) went on a bit and I cut down what I might have said for the following points. I may come back to re-edit this. I've got a handy little table, in mind, but I'm not sure it'll work much better to summarise everything I've been cogitating about for most of today while away from the keyboard... [[Special:Contributions/172.70.162.5|172.70.162.5]] 15:57, 28 May 2022 (UTC)
:The "hole" in the goalpost in American football is relevant for field goals, not touchdowns. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:43, 28 May 2022 (UTC)
::I'm not sure it's relevent for either. The field-goal passes over the crossbar and between (but also maybe above) the raised verticles, but that route is topologically the same as one above the crossbar but wide, which is in turn the same as one rolling along the ground and wide... Or indeed carried across just like most touchdowns (any that isn't run through the middle of the H-post', un-netted but otherwise soccer-like 'goalmouth' lower section).
::Possibly running around the post(s) that support the field-goal defining beams counts as the path around the topological hole because any change to that route that attempts to transform it to a useless loop within the main field of play must either (at some point) pass through the support for the crossbar or else wholly through the region that defines (in one direction, at least) the goal-scoring area. Can anyone get Word Of God in his intentions, here? It looks weird, to me. [[Special:Contributions/172.70.162.77|172.70.162.77]] 03:48, 29 May 2022 (UTC)

As has been alluded to, this must be an American university's topology department. A rest-of-the-world university would include four holes for cricket. [[Special:Contributions/172.70.134.191|172.70.134.191]] 17:48, 28 May 2022 (UTC)

Ok, this is my (not yet properly tabularised, or properly wikimedialinked) idea of all the kinds of information I'd suggest go in there. But it's a monstrocity and I don't want to remove the very useful existing information already in the Explanation (that may even be better/more accurate than my interpretation). ...so here it is for review. If anything in it is useful to anybody else as inspiration for future edits then... well, your choice!
*Click to expand:
<div class="mw-collapsible mw-collapsed leftAlign" style="width:100%">
Competition
|-
Field diagram
|-
Usage description
|-
Topology
|-

'''Type 1 Field'''
|-
(First image in comic.)
|-
Any path looping around this area can be moved at will and shrunk to just one point that could result from any other path.
|-
A homogonously flat lozange surface with no other notable features.

'''Baseball'''
|-
(Partial!) https://en.wikipedia.org/wiki/Baseball#/media/File:Baseball_diamond.svg
|-
The playing area for baseball contains many important physical features for scoring and playing purposes, but is essentially one flat area (and continuous airspace) when you disregard the elevation of the pitcher's mound or even the outfield fence and stands (for any ball that carries that far, upon being hit).
|-
Randall explicitly classes this in the Type 1 diagram, and there isn't any obvious reason to argue this point.

Association Football ("'''Soccer''''"/"Football")
|-
https://en.wikipedia.org/wiki/File:Football_pitch_metric_and_imperial.svg
|-
An unobstruted rectangular playing area with a goal formed of two vertical posts connected between the tops by a crossbar. In official competition (and where otherwise desired) there is a net stretched behind each goalmouth to stop any ball that passes completely through it (with or without hitting any of the posts), although games can be played with no net in place, or in street/schoolyard situations by goals defined only as a goalpost-like markings painted upon a solid wall (hitting the wall within the bounds of the painted line constitutes a goal, give or take arguments about whether it counts if it hit the line).
|-
Stated by Randall as a Type 1 (a single unobstructed zone), which is likely due to the 'pocket' of the net-backed goalmouth being nothing more than a straight extension of the playing area.
However, an un-netted set of goalposts might be considered a Type 3, with each set of goalposts defining an impassible frame (the hole in the topology, ''not'' the same thing as the physical hole formed by the goal-frame) within which the balls can freely pass and return ''not'' through the goalmouth, or vice-versa.

'''Tetherball'''
|-
https://en.wikipedia.org/wiki/File:Tetherball_in_Georgetown,_Seattle,_Washington.jpg
|-
A ball attached to a cord anchored at the tip of a pole that is in turn stuck in the ground.
|-
Although the mechanism used to allow free swivelling of the tether around the pole may be quite complex (including being looped around a helical thread to help register how many excess orbits of the pole the ball has made in either direction), the basic premise can be simplified to a single extrusion from the playing area, which is topologically identical to a playing area with no extrusion at all. Thus Randall properly states this as a Type 1 variant.

'''Type 2 Field'''
|-
(Second image in comic.)
|-
Any path that canot be shrunk to just one point will be pass around the unpassable hole in the topology.
|-
A homogonously flat lozange surface with a single central hole in it.

'''Volleyball'''
|-
https://en.wikipedia.org/wiki/Volleyball#/media/File:VolleyballCourt.svg
|-
A volleyball court consists of a flat area disected by a raised net in the centre. Valid shots pass over the net, but it is possible for the ball (or players) to pass between the net and the floor.
|-
Randall lists this under the Type 2 diagram. An argument can be made that the net could effectively reach to the ground, or questions asked about anchoring the net top/bottom to the posts at either side with separate straps (adding left and right 'passages' between the elements of the obstacle that is the net) but he clearly intends the loop around the hole to represent the ability to passing over the net one way and under the net the other (or vice-versa) as a topologically irreducible loop.

'''Badminton'''
|-
https://en.wikipedia.org/wiki/File:Badminton_court_3d.svg
(Note that this diagram completely abstracts the under-net area away.)
|-
The net setup is very similar to volleyball, i.e. raised above the ground, with very similar rules regarding valid shots between the areas on each side.
|-
As with Volleyball, Randall feels justified in this being classed as a Class 2, having similar reasons for this as well as possible arguments against.
(Note that another form of {{w|Badminton Horse Trials|Badminton}} is arguably far more topologically complex!)

'''High Jump'''
|-
https://en.wikipedia.org/wiki/File:1912_Platt_Adams5.JPG
|-
A bar supported at height between two supports. The idea is to successfully pass over the bar (without knocking it off, the bar being only supported to the supports, not firmly attached to them), although a competitor who decides to abort their attempt mid-run might well choose to pass underneath to default the attempt with the least physical and organisational aftermath.
|-
With an 'above' and 'below' path to potentially loop around (though not in a single jump), Randall chooses to ascribe this as a Type 2. If a competitor displaces the bar, during a failed jump, it can morph the topology into a Type 1 scenario

'''Type 3 Field'''
|-
(Third image in comic.)
|-
Any path that canot be shrunk to just one point will pass around one ot other ''or both'' of the holes in the topology.
|-
A homogonously flat lozange surface with two holes in it, towards each end.

'''Basketball'''
|-
https://en.wikipedia.org/wiki/File:Basketball_terms.png
|-
Played upon a court, at each end of which is a tall pole (or supporting wall or other structure) from which a 'basket' is projected over the playing area. The earliest baskets were an actual closed-bottom basket, but this required climbing up to retrieve balls successfully landed within them. By removing the bottoms of the baskets and, later, using just a hoop (with or without a bottomless net). Points are scored by sending the ball through the basket-loop ''from above'', to be retrieved for further play as it exits below.
|-
Topologically, the edge of each loop is directly connected to the ground, so it can be smplified as a two-hole Type 3 field (the hole in the field is the impassible rim in the basket-loop). This does not preserve the orientation (or intended unidirectional nature) of the basketball-shot, but this is Topology's fault, not Randall's!

American/Canadian Football ("Gridiron"/"'''Football'''")
|-
https://en.wikipedia.org/wiki/American_football_field#/media/File:AmFBfield.svg
https://en.wikipedia.org/wiki/File:Canadian_football_field.png
|-
A unobstructed rectangular playing area and two 'Endzones' at each end. Goalposts are either of an "H" shape or essentially a "Y" (crossbar, upper verticals and a single utilitarian post, usually set back beyond normal playing area with an extension over to hold the crossbar directly over the goal-line. The verticals are tall but are also conceptually projected upwards without limit, for scoring purposes, should a field-goal/etc be kicked high enough to exceed the structures.
|-
Stated by Randall as a Type 3 (a topological hole at each end of the field), which ''may'' represent the bound surrounding the elevated goal-scoring area. Alternately it represents the physical structure of the H-shaped posts which rationalise down to the open-backed ground-touching goalpost footings and the crossbar.

'''Parallel Bars''' or perhaps ''Uneven'' Parallel Bars
|-
PB: https://en.wikipedia.org/wiki/File:AlejandroonParallelBars.jpg
UPB: https://en.wikipedia.org/wiki/File:Paksaltoliukin.jpg
|-
The Parallel Bars are two horizontal bars supported at roughly hand-height, upon which a gymnast will perform various hand-supported feats strength and coordination. The participant will not usually fully use the space beneath either bar (and between the two supports for the bar), but a will needs the opportunity to grip fully around the bar, especially when the other hand is released for a complicated body movement and it would be impractical or a different discipline entirely to used a 'filled' bar-support.

The Uneven Parallel Bars are two similarly supported bars but at two different (and greater) heights, with the performance being generally that of keeping the grip of both hands (or knees/etc) on either one or other of the bars whilst rotating around its axis, when not actively transfering across between the bars themselves.
|-
Effectively two loops (as per basketball hoops but in a different orientation and scale). The Type 3 topology suggested by Randall is more meaningful for the use of Uneven Parallel Bars, but is probably applicable to the 'even' version in its own way.

'''Type 4 Field'''
|-
(Fourth image in comic.)
|-
Any path that canot be shrunk to just one point will pass around at least one (and possibly several) of the nine holes in this topology.
|-
A homogonously flat lozange surface with nine small holes dotted into it.

'''Olympic Swimming'''
|-
https://en.wikipedia.org/wiki/File:Swimming_pool_50m_2008.svg
|-
In competitive swimming, a swimming pool is often delineated into lanes (for Olympic purposes, Lane 0 to Lane 9, though usually not all will be used) by floating barriers and other markings. These provide a limited amount of wave-reduction but mostly keep competitors from inadvertently drifting across or into each others' paths.
|-
Randall considers this setup to require nine 'holes' in the competition area, presumably where the floats pass along the surface of the water, to make a Type 4 field of competition. He must then consider it perfectly possible for competitors to pass under ''or over'' these barriers, at will, with complete disregard for the usual competition (and risking disqualification). Otherwise, it might be best considered as (up to) ten ''separate'' Type 1 arenas, with just one swimmer in each.

'''Croquet'''
|-
https://en.wikipedia.org/wiki/File:Modern_croquet_equipment.JPG
|-
A game in which a number of metal hoops are placed in the ground such that a given number of players (or teams of players) must each propel their own ball(s), and possibly those of their opponents, through each loop either directly with their own mallet or through contact between balls.
Many variations exist with differing numbers of hoops and variations of rules and winning conditions. Randall appears to favour the "Nine-wicket Croquet" popular to North America.
|-
The topological simplification of nine hoops across a flat surface can be thought of as the Type 4 topology displayed.

Table Football ("'''Foosball'''"/"Table Soccer") - as per title-text
|-
https://en.wikipedia.org/wiki/File:Foosball_garlando_aerial.jpg
|-
An enclosed playing surface with (typically) eight rotatable and extendable bars supporting representative (soccer) 'footballer' figures, ready to strike a small ball across the surface, as might be desired by the two or more opposing players who are each able to control the movements of half of the 'bars' (each team's-worth having a goalkeeper, defence, midfield and attacking 'layer'). By skill and/or luck, the aim is to propel the ball into the opposing's player's goal.
On coin-operated games, often the playing area is usually sealed off from direct manual interference, and a ball that goes into the goalmouth finds itself in a lower chamber that stores the ball(s) and deposits them via some feed to carry the ball back up and 'thrown in' towards the centre of the table to start the next attempt at goal.
|-
With eight bars across, and potentially two goalmouth sinks, this may not actually add up to a nine-hole Type 4 field of play. But presumably Randall is thinking of a version that does.

'''Skee-Ball'''
|-
https://en.wikipedia.org/wiki/File:Skee_Ball.JPG
|-
An arcade game in which a ball is propelled by the player to land in (according to skill) one of various holes in a target-ridden surface (to return back to the player for another go).
|-
It would depend upon the exact confuguration of Skee-Ball machine but, again, Randall seems to think this matches the Type 4 topology.

Further (football) examples, unmentioned

Australian Rules Football ('Aussie Rules'
|-
https://en.wikipedia.org/wiki/File:Footygroundfix.svg
|-
An unobstructed oval field with four simple vertical posts upon the perimiter arcs at each end.
The ball passing between the (taller) central pair of each end's posts (projected upwards indefinitely) is a Goal. Passing between the outer posts and the adjacent central one (or bouncing off these) is a Behind.
|-
Type 1 if the protruding poles are rationalised to zero, without respect to scoring zones. Four ''or perhaps six'' topological holes (two or three per end) if respecting the imaginary projections indefinitely upwards for scoring purposes, depending upon if you care about chirality of the ball path.

Gaelic football ('Gaelic') - fields also used for Hurling
|-
https://en.wikipedia.org/wiki/Gaelic_football#/media/File:Gaelic_football_pitch_diagram.svg
|-
An unobstructed rectangular field with an H-shaped set of goalposts at each end, the area below the crossbar often being netted, while the upper verticals being nominally considered as projecting upwards without limit.
Valid balls sent over the crossbar and between the verticals are awarded Points; those sent into the netted goalmouth are Goals (equivalent to three Points for scoring purposes).
There is no in-play use of the area behind the line of the goalposts, unlike various other football codes with similar-looking posts.
|- Topologically, probably considered a Type 1. Goal-shots are into a 'pocket' extension (if nets are used), and Point-shots are topologically indistinguishable from passing over any other part of the boundary line.

Rugby League/Union ('Rugby'/'Rugby Football'/'Football')
|-
https://en.wikipedia.org/wiki/Rugby_union#/media/File:RugbyPitchMetricDetailed.svg
https://en.wikipedia.org/wiki/Rugby_league_playing_field#/media/File:NRL_Rugby_League_field.svg
|-
An unobstructed rectangular playing area and two 'In Goal' areas continuing on behind the 'Try Line' upon which the H-shaped goalposts sit.
The field of play extends into this area, the lower parts of the vertical posts play no purpose other than to hold the upper elements in the air. A 'Try' (roughly equivalent to a Touchdown) can be scored by placing the ball somewhere over the line or by touching the base of the (often padded) posts.
The cross-bar and the verticals upwards of it (towards and bounded at infinity) count as the hard boundary of a scoring area for "conversions" (taken immediately after a try) and other kicks (penalties and drop-goals).
|-
Might be treated as Type 3 (two holes), unless concerned about whether balls kicked through the goals or taking across the try line weave back one or other side of, or between, the lower vertical posts.
Alternately, is a Type 3 for the lower (not more special for scoring than any adjacent lower area) frames, while the open tops (meaningful for scoring purposes) rationalise as topologically irrelevent.
</div>
(TL;DR; - It's too long, you may not want to read it...) [[Special:Contributions/162.158.34.213|162.158.34.213]] 21:47, 28 May 2022 (UTC)

The extended discussion in the explanation about the issues with "two-holes for football" goes away if the goals are the H-shaped kind rather then the Y-shaped kind. Since the comic specifically states that these fields belong to the Topology Department - and are NOT generalized across all sports fields - then we can use the "two hole" information to deduce that the department's fields have the H-shaped kind...which solves 100% of the confusion and eliminates the long (and excessively intricate) digression about other weird forms of "football" with different topologies. [[User:SteveBaker|SteveBaker]] ([[User talk:SteveBaker|talk]]) 13:23, 29 May 2022 (UTC)
- agree [[User:Boatster|Boatster]] ([[User talk:Boatster|talk]]) 15:52, 29 May 2022 (UTC)

Is this really explainxkcd? Asking since I don't see the obvious stated anywhere. Hell, '''the obvious question and last statement of the image isn't even addressed'''. Why does no one ever want to use the topology department's athletic fields? Its a mystery right? Whats wrong with a soccer field that has a topology like that? It make detecting when the ball crossed the line so much easier.
Also, how has no one talked about the geographic/field topology that the last question implies along with the obvious reprecusions (ball roll down hill. stuck in middle. habing to climb. tripping in holes and breaking legs)? Why is everything so freaking high level here? '''Where the hell is the explanation of the joke's? Something is terribly wrong!''' [[Special:Contributions/172.71.82.81|172.71.82.81]] 17:56, 29 May 2022 (UTC)

: One of the more serious problems with explainxkcd is the well-known phenomenon that explaining a joke often kills the humor. So, quite often, in the course of fully explaining the cartoon - we do indeed shred the actual humor into tiny, tiny fragments. However, we're here to explain it - and that's that.
: I guess the joke is that the topology department are so obsessed with the topological shape of their sport's fields that they have lost the shape and dimensions of the fields - and thereby made them useless for playing actual sports on.
: Two fields that are topologically equivalent are not necessarily capable of being used for playing multiple sports. Swimming on a croquet field - or playing croquet in a swimming pool does not work. [[Special:Contributions/172.69.71.199|172.69.71.199]] 18:15, 29 May 2022 (UTC)
:: The goal is to explain the joke in '''laymans terms''' yaknow, "because your dumb". Since the joke is missed by those outside the fields and don't know how definitions of terms differ in different fields and whatnot. Its the whole purpose. The thing above explains nothing in laymans terms. There is no joke. All there is is an explanation on how field theory and topolgy work and then why the resulting images make sense. Nothing on why this is supposed to be funny. The one thing we actually have to explain at minimum. The joke seems to be that this field which is created for the reasons already described is the actual field we would play on (something completly unaddressed in the explanation above). This could be dangerous with those holes (also unaddressed). And then there is the unadressed question of is this a raised plot of land thats been cut out, or is this all that exist, and kicking the ball off field or falling in a hole goes into a void. This needs to be an explanation for people who are much, much, much dumber. We are not supposed to be explaining field theory, just enough of it to get the joke [[Special:Contributions/162.158.187.124|162.158.187.124]] 18:27, 29 May 2022 (UTC)
: explainxkcd was weird, but has definitely been getting weirder, and i also question its reality and worry for if the server breaks without somebody to fix it. i get a lot of reverses and edits that sometimes look like subtle vandalism or political information insertion. i think a lot of people are on twitter, and i think xkcd has an irc chat too. but i'm here for now. [[Special:Contributions/172.70.110.209|172.70.110.209]] 09:02, 31 May 2022 (UTC)

Wondering if any topologists understand American football, and if any football fans understand topology. I am a football fan who doesn't understand topology. As requested before, I would like to understand why there is any topological difference in analyzing the American football gameplay and playing field, between H-shaped and Y-shaped goals.

The field-goal-space is functionally a rectangle above the crossbar, and the width between the uprights, but of undefined height, in both the H and Y cases. It is directly above the back line of the endzone for pro and for college football. The one or two supports for the crossbar are irrelevant to gameplay. All supports below the bar would be eliminated, if the engineering problem could be solved. Why does the existence of one vs. two engineering kludges make a critical difference in the number of topological holes?

The endzone, that is, all of the space on the playing field (grass) in front of, and on either side of the goalposts is valid and legal for every player and for the ball on every play, potentially with scoring implications at the termination of the play. Note that the goal posts for pro football were at one time at the back of the endzone, then from 1933 to 1974, on the goal line, and since 1974, at the back of the endzone again. NCAA/college football has had the goalposts at the back of the endzone since 1927.

All of the space above the grass, above the endzone, both under and above the height of the horizontal crossbar, are also legal and valid for play by the players and by the ball on every play. In one case, a play involving a legally kicked field goal, the space above the crossbar and between the uprights, has scoring significance. A field goal has the same name and the same general mechanics in basketball and in American football. In neither case do the engineering contrivances supporting and suspending the goal rectangle (football) or circle (basketball) play a conceptual role in the gameplay. Why, then, do the topologists here in the discussion treat football and basketball differently, and why are H-shaped and Y-shaped goals in football not equivalent? Randall counts both basketball and football as 'two-holers', but the current public Expain xkcd text says that he is wrong for pro and college football. So far as I can tell, pro and college football have both used the Y-goal since 1974 or before. The Y-support for the goalposts is 6.5 feet behind the back of the endzone, and completely outside of the playing field. I look forward to learning something. [unsigned]

: I've edited the first paragraph to make this clearer, but topology is the mathematics which describes a particular aspect of a shape, which ignores many other specifics of shape, size and material. In particular topology pays attention to any place where something can pass through an object, like the holes shown (and places where the object passes through itself are even more interesting). So, while difference between the two supporting poles of the H-support goal and the single pole of the Y-support is irrelevant to gameplay, as far as topology is concerned it is basically the only relevant difference, as two poles supporting a bar form an aperture that things (balls, people) can pass through, and there is one such "hole" in each end.

: I am pretty sure Randall is ignoring all markings on the field and rules of play, considering that the joke is that the topology department is ignoring such important things as size (of volleyball vs high-jump "fields"), positioning (of basketball hoops vs parallel bars) and protrusions (of soccer nets or tetherball stands).[[Special:Contributions/172.68.66.37|172.68.66.37]] 02:21, 30 May 2022 (UTC)

In describing the shapes for the transcript, amused to find that the ellipses (plural of ellipse, oval) are used to denote ellipses (plural of ellipsis, missing material). Are the etymologies related? [[Special:Contributions/172.68.66.37|172.68.66.37]] 02:21, 30 May 2022 (UTC)

The discussion around football type appears to have missed out a fundamental point of terminology, namely that rugby is never called "football". It is one of the variants of football-type games, there is the fact that its codes are governed by the various Rugby Football Unions and Rugby Football Leagues around the world, there's even the fact that it's one of the things referred to by Australians as "footy", which derives from "football"... but isn't actually the word "football". While the word "football" obviously means different things in different contexts, when used on its own, without qualification, it never means "rugby".

Leaving the nets in place on a soccer field which is also used for other activities is not that usual, but it's not unheard of and does make easy sense of the lack of topological holes (and is easily explained by an American's likely unfamiliarity with common soccer-apparatus practice). H-shaped American-football posts have holes bounded by the ground, uprights and crossbar; these holes exist physically and may be described topologically, irrespective of their irrelevance to gameplay. [[User:Yorkshire Pudding|Yorkshire Pudding]] ([[User talk:Yorkshire Pudding|talk]]) 09:24, 31 May 2022 (UTC)
:Call yourself <s>a pudding, you Yorkshire</s> a Yorkshire, you pudding!?! It is far from uncommon to call {{w|Rugby_league|the game of 'rugby'}} by the name of "football" in the real heartlands of the sport... Though I doubt that this terminology has encroached into the US, what with their obsession with body-armour to slow things down and then taking a two-minute breather for every other minute of actual play in their peculiar version of handegg... ;) (I'm not casting aspersions upon their choices of sports, though, I hear they're fairly keen on rounders, which is actually slightly faster paced than even our one-day cricket...) [[Special:Contributions/172.70.162.5|172.70.162.5]] 10:20, 31 May 2022 (UTC)
::Ah, cobblers. It is uncommon to call anything other than the kicking of a round ball "football", even in the realm of the oval-balled faithful. Ask A. N. Other resident of the West Riding about football - they're not going to think you mean Trinity, Tigers or Hull K.R. [[User:Yorkshire Pudding|Yorkshire Pudding]] ([[User talk:Yorkshire Pudding|talk]]) 23:53, 31 May 2022 (UTC)

Can someone please clarify or remove the parenthesis about "points, in different disconnected topologies"? The fact that loops around a hole cannot be moved to loops that aren't around a hole is one thing, but where do the points or disconnected topologies come in? Or is it a separate concept, of points existing in one topology not existing in another one because there is a hole there? [[Special:Contributions/172.68.146.81|172.68.146.81]] 02:51, 1 June 2022 (UTC)

Amused that the citation needed comment on swimming pools being filled with water is not fulfilled by the wikilink for Olympic-sized swimming pools, as that article does not explicitly state anywhere that the pool should be filled with water! [[Special:Contributions/172.68.146.81|172.68.146.81]] 03:16, 1 June 2022 (UTC)

To the editor who corrected the "ellipsis" in the transcript, not sure if you're reading the discussion, but it was deliberate and I do know the difference - the whole reason I noticed the ellipses/ellipses double meaning was because I was trying to replace the word "hole", as the rest of the article hadn't yet been updated to clarify the difference between topological holes in a negative space and holes in a solid object. As it stands, "ellipse" is probably the better word for the purposes of describing the picture for the transcript, rather than "ellipsis" for the missing material it is depicting. If I've slipped up anywhere else, please feel free to fix. [[Special:Contributions/172.68.66.63|172.68.66.63]] 00:45, 3 June 2022 (UTC)

2625: Field Topology

2022-05-30T01:48:33Z

172.68.66.63: /* Transcript */

{{comic
| number = 2625
| date = May 27, 2022
| title = Field Topology
| image = field_topology.png
| titletext = The combination croquet set/10-lane pool can also be used for some varieties of foosball and Skee-Ball.
}}

==Explanation==
{{incomplete|Created by A DONUT, OR WAS IT A COFFEE MUG? Please check the new first paragraph, especially the end. And maybe move the mathematical fields/Fields Medal diversion to a footnote. Do NOT delete this tag too soon.}}

Field Topology is [https://encyclopediaofmath.org/wiki/Topological_field a subject in mathematics], but in this comic, Randall is instead examining the topology of playing fields used for various recreational activities. The comic strip depicts a situation where the common practice of multi-use athletic facilities has been organized by the "topology department" and constructed to be shared by all sports whose normal playing fields are {{w|topology|topologically equivalent}}. However, one key assumption in topology is that you can ignore the specificities of shape, size and material of the objects concerned. This presents an amusing contrast with the actual activities listed in the comic, where the size and shape of hoops, nets and bars and the material of the field itself can be very significant [citation needed].

(Not to be confused with {{w|Field (mathematics)|mathematical fields}}, or the {{w|Fields Medal}} prize -- although successfully {{w|Straightedge and compass construction|constructing}} these fields might lead to medals of one kind or another being granted).

In topology, shapes which can be smoothly deformed into one another without adding or removing holes are considered to be "equivalent". Note that a topological hole is an area of the nominal space (or area, or other manifold) through which nothing restricted to this topology can pass. In describing a real-world archway, for example, this would be where the material of the arch is, not the actual 'hole' passing ''through'' the constructed arch, which is the path that one indeed may (or must!) pass through to get from one region of the layout to another. A loop is a path across the allowable territory of a topology (or a viable circuit to make through the world it describes) that end up where it started. If a loop cannot be tightened (ultimately adjusted to take a shorter path) down to a single point, then it must be wrapped around at least one 'topological hole' (i.e. through a physical one), and you have separately unique paths (or points, i.e. on different disconnected topologies) where you cannot adjust one loop to take the route of another, without severing a looped-path and reconnecting it.

{{w|Baseball}}, and {{w|tetherball}} are played on fields without any holes that the ball or players can completely pass through, so they are ({{w|Group (mathematics)|grouped}}) (physically and mathmatically) into one continuous field without holes. The goals on a {{w|soccer}} field presumably do not create holes because the goalposts and crossbar are connected to the field by the net, so the goals and field are topologically equivalent to a smooth disc. Any path taken into and out of the goal (any number of times) is topologically equivalent to one that does not go into this pocket of space at all.

{{w|Volleyball}} and {{w|badminton}} are played on a court through the center of which passes a net suspended from poles, and the {{w|high jump}} has a bar that contestants jump over. The space bounded by the bottom of the net (or bar), the supporting poles, and the ground can be considered to be a hole, a path over and under the net/bar cannot be simplified to one that does not, so their fields all have one "hole".

A basketball court has two physical pathable holes, the nets. Parallel bars can be thought of as two rectangles and thus as two topographical "holes". Both have opportunities to path through either (or both) structures, and so the material of the structures define a hole in the topological abstract of the playing 'surface'. Since we are told that these sports fields belong to the Topology Department - and are not necessarily generalized to all sports fields - we may safely assume that their "football" field is for "American football" and uses the older H-shaped football goals rather than the more modern Y-shaped ones. An "H" shaped goal creates a topological hole under the crossbar at both ends of the field. A more modern football field with Y-shaped goals would have no holes.

The lane dividers in a swimming pool create bounded holes on the 'playing surface' equivalent to one less than the number of lanes. And each hoop in croquet is a hole with one edge bounded by the playing surface. Similarly, as mentioned in the title text, this configuration is also {{w|homeomorphism|homeomorphic}} to a {{w|foosball}} table (with each rod sustaining the player figures above the table defining a hole) or a {{w|Skee-Ball}} lane (which is even more straightforward, as it is just a plane with several holes in which to throw balls).

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

A row of four signs, each held up by two posts, followed by a row of four rounded lozenge shapes, one for each sign. The signs and lozenge shapes are shaded as if three-dimensional objects, all being flattish with a small third dimension; the four lozenge shapes each have one pair of sides horizontal and the other pair at a slight angle from vertical, denoting a horizontal plane perpendicular to the signs extending "out" towards the viewer, which places each shape "in front" of its sign. All but the first lozenge shape have various numbers of ellipses within the shape, shaded to denote holes piercing through the objects.

Leftmost sign: "Baseball. Soccer. Tetherball." The shape below this sign has no holes.

Second sign from left: "Volleyball. Badminton. High jump." This shape has one large hole in the centre.

Third sign: "Basketball. Football. Parallel bars." This shape has two large holes - one in the top half and one in the bottom half.

Fourth and rightmost sign: "Olympic swimming. Croquet." This shape has nine small holes - eight arranged symmetrically towards the edges of the shape and one in the centre.

Caption underneath the signs and shapes: No one ever wants to use the topology department's athletic fields.

{{comic discussion}}
[[Category:Math]]
[[Category:Sport]]

123: Centrifugal Force

2022-05-21T01:29:06Z

172.68.66.63: Undo revision 270770 by Explain xkcd server admin (talk)

↑{{comic
| number = 123
| date = July 3, 2006
| title = Centrifugal Force
| image = centrifugal force.png
| titletext = You spin me right round baby, right round, in a manner depriving me of an inertial reference frame. Baby.
}}

==Explanation==
[[Black Hat]] has strapped {{w|James Bond}} to a centrifuge and claims that the {{w|Centrifugal force|centrifugal}} force will be lethal. Bond objects that there is no such thing, but just {{w|Centripetal force|centripetal}} force. The notion of centrifugal force is a common one, as we experience it whenever we turn. Teachers will initially teach Newtonian mechanics in an inertial frame, and in inertial frames, the centrifugal force is zero. Instead, a body that moves in a circle does so because of a centripetal force (acting towards the centre of the rotation). This is a reasonable (and correct) view, but it is a subtle point that many students find hard to grasp, as it seems to contradict their personal experience of centrifugal forces. For the sake of exposition, teachers may claim that "There is no such thing as centrifugal force." This, however, is also a misconception, which is addressed in the explanation below:
;Observers' point of view (Black Hat, us, etc.)
:James Bond is moving in a circle, and is therefore accelerating. The force keeping him there is an inward force of contact against the centrifuge, a centripetal force. Via Newton's {{w|Newton's laws of motion#Newton's third law|third law}}, since the centrifuge is pushing Bond inward, Bond is pushing the centrifuge outward. The centrifuge's material is strong enough not to break under this force, however.
;James Bond's point of view
:In James Bond's frame of reference, Bond is at rest. He is kept there by two forces: the above-mentioned inward force of contact against the centrifuge, and an ''outward centrifugal force''. He feels both forces.

As mentioned in the explanation, as the centrifuge rotates faster, the forces needed to keep him in motion get larger, so the force he feels gets larger. This will eventually kill him. The conclusion will be the same regardless of which frame of reference is chosen.

Teachers of mechanics are well aware of this; however, in introductory expositions, these ideas are often not taught. In theoretical mechanics, one describes the positions and velocities of the particles in a model relative to a frame of reference. This means that a time is chosen to be time 0, and positions are chosen to be (0,0,0), (1,0,0), (0,1,0), and (0,0,1). With these chosen, the position and time of any particle in the system can be described. It is an axiom of Newtonian Mechanics that there exist "Inertial Frames." In an inertial frame, a particle will remain at rest or at a constant speed unless acted on by an external force, and Newton's second law takes a simple form: F = ma. The surface of the Earth approximates an inertial frame. In a non-inertial frame, such as one rotating with a giant centrifuge, or moving with an accelerating vehicle, a particle will accelerate, relative to the frame. Newton's second law, when formed in such a frame, is much more complicated, as it has terms for the linear acceleration of the frame, the angular acceleration of the frame, the centrifugal force, and the {{w|Coriolis force}}. These extra terms are sometimes called "fictitious forces," as they result from the choice of the frame of reference. The mathematics required to describe problems in a non-inertial frame is more sophisticated, and all problems may be solved using an inertial frame. Thus is reasonable that teachers at school level "{{w|lie to children}}" and teach the mechanics in inertial frames.

James Bond was almost killed by a centrifuge in {{w|Moonraker (film)|Moonraker}}. The final statement by Black Hat is that said by {{w|Auric Goldfinger}} in {{w|Goldfinger (film)|Goldfinger}} in response to James Bond's question "Do you expect me to talk?"

The title text is inspired by {{w|Dead or Alive (band)|Dead or Alive's}} famous song from 1985, "{{w|You Spin Me Round (Like a Record)|You Spin Me Round}}."

Randall feels very strongly that the centrifugal force is a real thing. He links to this comic in the first footnote of his [[what if?|What if?]] article [https://what-if.xkcd.com/92/ One-Second Day] and the 6th footnote of [https://what-if.xkcd.com/157/ Earth-Moon Fire Pole], stating that it is a real thing, and that he will go so far as to strap arguers to a centrifuge that he or someone he knows apparently owns.

As can also be seen in the [https://twitter.com/bohacekp/status/531500491180875776/photo/1 footnote on page 132] in his [[what if?#The book|What if? book]], he will even fight you about it. From the book: 
"Furthermore, if you're on the equator, you're being flung outward by a centrifugal force1."
 "1Yes, centrifugal. I will fight you."
 (The article itself is about what happens if you lose all your DNA, so it has not much to do with this "real" force... The sentence is just stating that the actual weight loss from losing all your DNA is similar to the weight loss you would experience by moving from the poles to the equator due to this force.)

==Transcript==
:[James Bond, drawn as Cueball, is strapped to a giant wheel suspended from the ceiling. Black Hat is standing next to two levers.]
:Black hat: How do you like my centrifuge, mister Bond? When I throw this lever, you will feel centrifugal force crush every bone in your body.
:[Same scene, but a closer shot.]
:Bond: You mean centripetal force. There's no such thing as centrifugal force.
:Black hat: A laughable claim, mister Bond, perpetuated by overzealous teachers of science. Simply construct Newton's laws in a rotating system and you will see a centrifugal force term appear as plain as day.
:[Closer shot, only Bond's head is visible.]
:Bond: Come now, do you really expect me to do coordinate substitution in my head while strapped to a centrifuge?
:Black hat: No, Mister Bond. I expect you to die.

==Trivia==
*This comic is available as a signed print in the [https://store.xkcd.com/products/signed-prints xkcd store].

{{comic discussion}}

[[Category:Comics featuring Black Hat]]
[[Category:Physics]]
[[Category:Comics featuring Cueball]]
[[Category:Footer comics]] 
[[Category:Comics with xkcd store products]]

623: Oregon

2022-05-21T01:28:41Z

172.68.66.63: Undo revision 270772 by Explain xkcd server admin (talk)

{{comic
| number = 623
| date = August 14, 2009
| title = Oregon
| image = oregon.png
| titletext = A century later, the harrowing flight of the survivors from Oregon was dramatized in a popular video game.
}}

==Explanation==
This comic relates to the computer game ''{{w|The Oregon Trail (video game)|The Oregon Trail}}'', and humorously depicts the consequences to real-world Oregon if everyone had arrived in the same manner they did in the game.

''The Oregon Trail'' was an educational computer game released in 1971, but the version referred to is likely the more popular 1985 version. In the game, players would play as a character taking a trek west along the {{w|Oregon Trail}} from Missouri to Oregon. The player's journey starts in 1848 and typically takes less than one year to complete. Along the way, the player must manage resources (food, spare parts, etc.) {{tvtropes|DoomedExpedition|and face risks and dangers (starvation, disease, etc.)}}. Most players at the time were grade-school students. The game was very popular, and thousands of players played it monthly.

The game made it very easy to hunt for food. Large animals (bison, bears, etc.) were very easy and rewarding targets, where spending a single bullet could be enough to collect enough food for multiple days. There were also smaller prey available (rabbits, squirrels, etc.) which were harder to catch and provided less food. Since bullets are much lighter and cheaper than food, it was a good strategy to bring the minimum amount of food and plan to hunt for meals. Extra food can even be traded for money or other supplies, so it wasn't necessary to start the journey with anything except bullets.

The comic tries to document, as though in a historical fashion, what would have been the result if all the players had been real settlers who really had prepared for their journey on the Oregon Trail in that way. The parts before 1848 are historically accurate. Starting from 1848, however, players of the game would form an unbelievably large influx of people arriving nearly simultaneously, with very little food or supplies being brought along. Massive overhunting would soon strip the land bare, all large game slaughtered for meat, with hunger, starvation and disease soon to follow. {{w|Dysentery}} in particular was very common in the original game and perhaps the most infamous way to die, hence its listing as the most prominent epidemic.

The title text makes things rather recursive. In this alternate reality, thousands upon thousands of people fleeing ''from'' the overpopulated, devastated Oregon becomes the focus of another video game, much like ''The Oregon Trail'' in our universe.

==Transcript==
:History of 19th-century Oregon

:[Timeline, with relevant images next to various dates.]

:1805
::[Two men stand at the edge of a cliff. One has a walking staff.]
::Arrival of Lewis & Clark

:1825
::Early settlers arrive

:1841
::Oregon Trail established

:1843
::Larger western migration begins

:1848
::[A horse is pulling a covered wagon. A gun peeks out the back.]
::Huge wave of 500,000+ settlers arrives from Missouri. Largely children and adolescents, most bring nothing but cartloads of bullets for hunting.

:1849
::[Cueball and Megan with rifles aim at something.]
::Overhunting begins to devastate ecosystem
::Dysentery epidemic.

:1850
::[Tombstones and bodies.]
::Shooting deaths skyrocket
::Typhoid epidemic
::Measles epidemic
::Cholera epidemic

:1851
::All mammals larger than squirrels wiped out by overhunting
::Massive famine

:1852
::[Sun low over a land, devoid of life. Scattered remains of corpses and skeletons.]
::Last survivors flee
::Oregon territory abandoned

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Video games]]

1608: Hoverboard/Screen-shots

2022-05-21T01:27:41Z

172.68.66.63: Undo revision 270769 by Explain xkcd server admin (talk)

*Here is a collection of screen shots from the dynamic comic [[1608: Hoverboard]] representing interesting situations, that may or may not be described in the explanation.
**It could be the messages shown in the play area (time records).
**Special places to see something different
**Or anything that might be interesting.

==Entire play area==
*It is possible to stand on the wall under the right triangular outcrop and see all the inner walls of the play area as well as floor and ceiling. But one coin just left of the hoverboard has to be taken to get there. The first picture shows a situation just before this coin is claimed, thus showing all coins in place and the entire area visible, the next shows the situation where you stand on the wall seeing the entire play area minus one coin:
[[File:All play area hanging all coins.PNG]]
 
[[File:All play area standing minus one coin.PNG]]

==Return to the play area==
*The flashing warning message in red letters at the bottom of the screen when you leave the play area. Here while you are standing outside the confining wall to the right of the play area:
[[File:Return to the play area.PNG]]

==Coin collecting messages==
*In yellow text (on the black part at the bottom of the screen) your score will be displayed when you deliver the coins at the deposit (Number or coins and time used).
**Below this a message will rate your score, depending on the number of coins (See [[1608: Hoverboard#Messages in the starting area]]).
*Here are screen shots of all types of messages (except the one with all coins).
**These have all been acquired without using any [[1608: Hoverboard#Cheats and Exploits|cheats]] - so the time is valid for playing the game as originally intended.
**In case you wonder if this is true, notice that the one who have uploaded these pictures also took the time to make the complete [[1608: Hoverboard/Transcript]]...

===0 coins===
[[File:0 coins.PNG]]
===1 coin===
[[File:1 coin.PNG]]
===2-4 coins===
[[File:2 coins.PNG]]
 [[File:4 coins.PNG]]
===5-9 coins===
[[File:5 coins.PNG]]
 [[File:9 coins.PNG]]
===10-16 coins===
[[File:10 coins.PNG]]
 [[File:16 coins.PNG]]

===17 coins===
*All coins in the play area:
[[File:17 coins.PNG]]
===18 coins===
*To get more coins you need to go outside. The fastest coin to reach to get just 1 more is the one on top of the tip of the Star Destroyer straight over the right barrier wall. It take at least 30 seconds extra to get that (Note the undefined from Internet Explorer):
[[File:18 coins.PNG]]
===42 coins===
*Collected over looong time:
[[File:42 coins.PNG]]
===More than 42 coins===
*Realistic time to get to 42, but counted wrong...:
[[File:45 coins.PNG]]
===All 169 coins===
*This time (less than 25 minutes) obtained by following the directest route through all coins without taking any detours. Starting by going right to the end, then up from the kite directly to the floating rock, four full jumps off the rock to land on the tip of the Destroyer, optimized way through that, which is by far the hardest task to plan and remember to include the top coin in the torpedoes and the one below the glitch floor, almost never retracing (except when absolutely necessary), and then down to the nest at the end of the world, to go back along the ground to the play area, remembering to take the four coins around the Blockade Runner after the last of the three in the dunes. Could of course be done faster, as there where plenty of places where it was not the optimal speed, but the route is quite close to being optimal!
[[File:169 coins fastest way.PNG]]

*This time obtained by following the entire route described in the complete [[1608: Hoverboard/Transcript]], taking the coins in that order (More than 1½ hours):
[[File:169 coins transcript way.PNG]]

==Timing of different routes==
*Here below are some images of the message when taking different routes through the image to give an idea of the time it takes to reach different parts of the image.
===Reaching all the boundaries===
*The time given in this image below (9 minutes 46 s), to just collect "all" 17 coins, was used to reach the coins and positions at the four extremes in the image.
**Only one coin was taken inside the Play Area (you cannot avoid that)
**The other 16 coins were taken at the four extremes and also the extreme parts of the image was reached, coin or nor coin.
***Coin #1 was the one to the left of the terminal (the starting point for this endeavor). From there the Play Area was exited straight up out of the starting maze and then left.
***Coin #2 was the one in the well to the left, which is the coin located at the lowest position in the game.
***Coin #3 to #6 was the four at the left end of the world the last coin being the one furthest left in the game. Before returning right, the edge to the left with the girl was reached.
***Coin #7 was the one on top of the floating rock island in the sky, this is the coin located at the highest position in the game.
***Going over to the Destroyer from there and up to the bridge (taking no coins), to stop at the top of the Globe of Death to stand on the highest position in the game, and then going over the rear end of the Destroyer.
***Coin #11-17 was the 10 in the nest at the right end of the world, one of which is the coin located at the right most position in the game. Before going back the right edge is reached.
***From there the trip goes back to the Play Area, without taking any coins, but on the way is a stop, whereby walking under the rouge wave to walk on the lowest point in the game.
***Finally going down to the terminal without taking any more coins, it sums up to the 17 coins, although 16 of them has been picked up in the extreme positions.
**The trip could probably be performed slightly faster, but not much faster than 9 minutes and 30 seconds.
[[File:Reaching all extremes.PNG]]

==All of Play Area==
*This is not screen shots per se, but they are made among other from screen shots. See full description of the images here:
**[[1608: Hoverboard#Play Area used as example|Play Area used as example]]
[[File:1680 Play Area Full Size Images Only.png]]

[[File:1680 Play Area Full Size Tiles and View.png]]

[[File:1680 Play Area Full Size Coins Hoverboard and View.png]]

[[File:1680 Play Area Full Size Coins Hoverboard Tiles and View.png]]

{{DEFAULTSORT:1608}}
[[Category:Comic subpages]]

853: Consecutive Vowels

2022-05-04T00:58:10Z

172.68.66.63: Undo revision 233422 (vandalism) by X. K. C. D. (talk)

{{comic
| number = 853
| date = January 28, 2011
| title = Consecutive Vowels
| image = consecutive_vowels.png
| titletext = But the windows! What if there's a voyeur watchi-- wait, now I'm turned on too.
}}

==Explanation==
After running some analysis on a database, [[Cueball]] shows [[Megan]] a chart depicting the relationship between sexual arousal and consecutive vowels, showing that a high amount of consecutive vowels is linked to higher sexual arousal. At first, it could be theorised to be due to drawn out moans or screams during lovemaking and orgasm (Ooooh! Yeeeees!).

Megan says she doesn't get it, but Cueball interrupts her with "queueing", a word with 5 consecutive vowels. This {{tvtropes|CoitusEnsues|immediately arouses Megan, who grabs Cueball and shouts "FUCK ME NOW."}} It turns out that the consecutive vowels themselves appear to cause arousal, rather than arousal causing the use of consecutive vowels.

The title text shows that Cueball is fearful that there may be a voyeur peeking at them, but as "voyeur" has 4 consecutive vowels because "y" is a vowel in this case, Cueball gets turned on as well.

==Transcript==
:[Megan stands at the left while Cueball comes from right holding up a chart.]
:Cueball: I was running a factor analysis on this huge database, and check out what it found:

:[An xy-graph plotting "sexual arousal" against "consecutive vowels." The trendline through the dots is a smooth exponential increasing curve.]

:[Frameless panel:]
:Megan: Huh? This chart makes no sense. What-
:Cueball: "Queueing"

:[Zoom in, Megan grabs Cueball.]
:Megan: ''FUCK ME NOW.''

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Line graphs]]
[[Category:Language]]
[[Category:Sex]]

2612: Lightsabers

2022-05-04T00:54:08Z

172.68.66.63: Undo revision 236237 (vandalism) by 172.69.235.151 (talk)

<div style="display: none">crap</div><noinclude>''For the comic named "Lightsaber", see [[1433: Lightsaber]].''</noinclude>
{{comic
| number = 2612
| date = April 27, 2022
| title = Lightsabers
| image = lightsabers.png
| titletext = A lot of Jedi romances start with this turning into a Lady and the Tramp spaghetti situation.
}}

==Explanation==
{{incomplete|Created by a MAGNETICALLY CONFINED PLASMA-SABER REACTOR - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
A {{w|lightsaber}} is a fictional beam-like sword weapon used by members of the {{w|Jedi}} order and the {{w|Sith}} in the ''{{w|Star Wars}}'' franchise. This comic shows a lightsaber fight starting between two [[Cueball]]-like Jedi, one already presenting their blade in challenge and the second activating theirs in response. When the first strike is made between the two lightsabers, they meld together with a bloop sound, like the beams are made of a liquid. The two light beams then remain stuck to each other. In in-universe "technical documents", lightsabers are said to be made from magnetically-confined plasma, so perhaps the magnetic fields which were projected from each hilt have merged instead of repelling (or presenting as mutually impervious) as is usually expected.

(This scene actually looks a lot like what happens between Harry Potter and Voldemort's wands in the end of the fourth book, the {{w|Harry Potter and the Goblet of Fire|''Goblet of Fire''}}. Here two spells hit each other and connect the two wands, the wand holders then unable to release or disconnect the wands.)

First the left Jedi, then the right, shakes the hilt, trying to break the bond. When this does not succeed, the right Jedi then deactivates his lightsaber in an attempt to end the connection. This causes the retraction of the entire double-sized light beam into the handles (as seen in the movies), causing both of the Jedi to be drawn together until their heads bonk, forcefully enough to render them both unconscious. The connected lightsaber handles lie next to them on the ground.

The title text implies that such events are how {{w|Jedi}} romances start, comparing it to the famous "spaghetti scene" from the 1955 Disney animated movie ''{{w|Lady and the Tramp}}'' where the two titular characters unintentionally kiss after sharing a strand of spaghetti. In the Old Republic, Jedi were forbidden from entering into romantic relationships (and discouraged from forming attachments in general), but in the pre-Disney ''Star Wars Legends'' continuity of the {{w|Star Wars in other media|Expanded Universe}}, {{w|Luke Skywalker}} and {{w|Mara Jade}} first met while fighting in the aftermath of the fall of the Empire, and then developed a romantic relationship.

Star Wars is a [[:Category:Star Wars|recurring theme]] on xkcd, and lightsabers have been prominently featured before in, for instance, [[1397: Luke]] and [[1433: Lightsaber]], where the problem with the physics of a light beam as a sword is shown. But in general light does not interact with light as {{w|photons}} are {{w|bosons}} and can thus pass through each other. Interference, yes, but two pure light beams cannot collide and bounce back as when two lightsabers collide. Also as the comic Lightsaber mentioned above shows, there is no compatible real-world way of confining a beam of light, making it stop after about a meter (or anywhere){{Dubious}} - see {{w|Optical cavity}}.

==Transcript==
:[Two Cueball like Jedi are engaging each other in a duel using lightsabers over 12 panels of equal size, with sound effects as the only sound. In the first panel the left Jedi has his lightsaber extended holding it in both hand pointing towards the other, who at this time is just turning his lightsaber on.]
:''Tssssss''
:Click

:[Almost same position of the Jedi, but the right Jedi's lightsaber has now extended, making a sound. He is holding it up near his head in both hands]
:''Tsss''

:[Then they run towards each other and swing their lightsabers towards each other, two small arcs indicating the swing of the lightsabers.]

:[The two beams hit each other and connects at the middle in a big bloop of light, with drops of "light" jumping off both above and below the connected lightsabers. Both Jedi still holds on to their handles with both hands. A loud sound comes out of the connection:]
:''Bloop''

:[The Jedi stands still holding their handles. The beam is now forming a bow between the two handles.]

:[The left Jedi violently shakes his handle causing a wave to travel down the beam towards the right Jedi.]
:Shake shake

:[The right Jedi shakes his handle and well and another wave travels the opposite direction towards the left Jedi.]
:Shake shake

:[Back to the bow of light between them, but the beam is visibly still shaking, but no wave is traveling any longer.]

:[Same setting but the shaking has stopped. The right Jedi turns his lightsaber off on his handle with a sound:]
:Click

:[The beam of light is retracted quickly into the handle of the Jedi turning his lightsaber off. So quickly that the two Jedi, still holding on to their handles are pulled up in the air and towards each other as the sound of the beam turning off is heard. Lines indicate their movement and shadows on the ground beneath them indicate they are in the air.]
:''Zhhhiiiip''

:[When the beam is completely retracted the two handles collide and so do the heads of the two Jedi with a loud sound. They still hold on to their handles with both hands. They still hang in the air with shadows on the ground beneath them.]
:''Bonk''

:[In the final panel the two Jedi lie unconscious on the ground with their heads towards each other and with their arms stretched out towards each other. The connected handles lie between them.]

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Multiple Cueballs]]
[[Category:Star Wars]]
[[Category:Fiction]]

Talk:Main Page

2022-05-04T00:53:11Z

172.68.66.63: Undo revision 236277 (vandalism) by 172.69.235.151 (talk)

{{notice|This page is for discussion of the [[Main Page]] itself. For discussion of the latest comic, see [[{{LATESTCOMIC}}#Discussion|its discussion section]]. Other issues probably belong at the [[Explain XKCD:Community portal]].}}

{{notice|This page has a sandbox, located at [[Main Page/sandbox]].}}

As a new user, I think the first page is very important. So I thought why not begin a discussion here what to have on the first page every user visits.--[[User:Relic|Relic]] ([[User talk:Relic|talk]]) 05:59, 1 August 2012 (EDT) Re-signed here - b/c I broke the comment in two when I added the "List of comics" header. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 23:01, 2 August 2012 (EDT)

==List of comics==
I was thinking of having a quick link to the list of comics that is explained. Right know, it took me a while to even see any of them. Eventually I found the "List All Pages" (found it in Special pages) where I could find the comics that have been explained. What do you think?
:A category tag will do that for you automatically. Having a list of comics indexed by its number would be a little different.--[[User:Relic|Relic]] ([[User talk:Relic|talk]]) 05:59, 1 August 2012 (EDT)
::Sounds like a great list - I ''think'' it'd have to be manually maintained until/unless we get someone who knows how to make a bot update it. Categories will be useful, but they only work if someone added the category to the page in the first place. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 07:21, 1 August 2012 (EDT)
:::A (somewhat) related question - should [[:Category:Comics]] be sorted alphabetically or by comic number? --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 07:43, 1 August 2012 (EDT)
::::I think [[:Category:Comics]] should be sorted by comic number. If you are looking for a specific comic, you will use the search field. Is there a way to make that happen? --[[User:Jeff|Jeff]] ([[User talk:Jeff|talk]]) 08:11, 1 August 2012 (EDT)
:::::They are two different functions. For the former, instead of adding <nowiki>[[Category:Comics]]</nowiki>, add, say, <nowiki>[[Category:Comics|1]]</nowiki>. For the second, we can create redirects. Normally, I'd say just make sure the search term was in the article text, but since numbers are going to be use for other purposes than just comic titles, it may be better to create [[1]] and [[Comic 1]] as redirects to the relevant articles right off the bat. --08:24, 1 August 2012 (EDT)
::::::We could also have a comic-list template on the Main Page, I suppose, or perhaps two - one for number and one for name? --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 08:54, 1 August 2012 (EDT)
:::::::Here's what I was thinking of for that: {{tl|Comics navbox}} Thoughts? ''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]]
:(outdent) It's ugly, but a sortable wikitable [[User:SurturZ/sandbox|(click here for example)]] could be used as a checklist to see what has been uploaded and what hasn't. What's the project namespace here, anyway (analogue of "WP:")? --[[User:SurturZ|SurturZ]] ([[User talk:SurturZ|talk]]) 03:04, 3 August 2012 (EDT)
:OK, I've found a way to get all the titles of the comics, so I was confident enough to create <big>[[Explain XKCD:Checklist]]</big> which can be used to fill in the gaps. --[[User:SurturZ|SurturZ]] ([[User talk:SurturZ|talk]]) 03:41, 3 August 2012 (EDT)
::I'm liking the checklist! That should do quite nicely as a "tool for editors". (I'm linking to it at the Community Portal). We still need the "template for readers." Did you think {{tl|Comics navbox}} was on the right track or should we do something else for that? --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 20:09, 3 August 2012 (EDT)
::Better idea - I'm throwing it directly onto the Main Page. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 20:10, 3 August 2012 (EDT)

==Admin list==
You can find a system-accurate list of admins [{{canonicalurl:Special:ListUsers|group=sysop}} here], so that might good to share, along with the manual list. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 07:13, 1 August 2012 (EDT)
:Added to page. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 08:10, 1 August 2012 (EDT)
::That's exactly what I wanted, but couldn't find the auto page for it. I knew it was somewhere. I don't see any reason to keep the link to the manual page. Do you? --[[User:Jeff|Jeff]] ([[User talk:Jeff|talk]]) 08:11, 1 August 2012 (EDT)
:::Not unless you want it. I'll remove it. Should I add the similar link for 'crats or is that unnecessary at this point? --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 08:25, 1 August 2012 (EDT)
::::To be honest, I have no idea what the Burecrats role does. Might be unnecessary now but helpful in the future? --[[User:Jeff|Jeff]] ([[User talk:Jeff|talk]]) 11:16, 1 August 2012 (EDT)
:::::Bureaucrats can turn other users into administrators (or indeed, other bureaucrats). That privilege isn't available to ordinary administrators. I'd keep it to yourself for the time being. :-) --[[User:Yirba|Yirba]] ([[User talk:Yirba|talk]]) 17:39, 1 August 2012 (EDT)
::::::You can actually see a technical list of which rights each group confers at [[Special:ListGroupRights]]. As the wiki grows, you might want to spin off a few, such as the ability to grant rollbacker and autopatrolled, to admins as some other wikis have. But for the time being, at least, there's really no reason for the wiki to have more than one 'crat. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 17:07, 2 August 2012 (EDT)

== Community portal ==

I've created the [[Explain XKCD:Community portal]] as a tools/help page. If that's not what you want, feel free to change/move/whatever it, but I thought it'd be nice to save this page for discussion of the Main Page and discuss the wiki as a whole/ask for help there. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 08:36, 1 August 2012 (EDT)

== Direct link to latest comic ==

There should be a direct link to the latest comic at the top of the Main page. A nice thing about going to explainxkcd.com was that the latest comic is right there at the top. For those changing their default link to the wiki, there should be an easy "Latest Comic" link that quickly takes them there. I'm sure some folks actually skip xkcd.com and come directly here instead to read the latest offering from Randall. They shouldn't have to search for it.
[[User:Christopher Foxx|- CFoxx]] ([[User talk:Christopher Foxx|talk]]) 11:59, 1 August 2012 (EDT)

: Maybe the page [[latest]] should redirect to the most recent comic? Could that be taken care of by some sort of script/template so it doesn't have to be manually updated? Should each explination page also have "next", "previous", "random", "first" and "latest" links, possibly also generated automatically via scripts/templates? Additionally, shouldn't the number page be the canonical one? It seems like [[Internal monologue]] should redirect to [[1089]] rather than the other way around - certainly it would make a bunch of scripting types of things a lot easier. [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 13:02, 1 August 2012 (EDT)
:::If you wanted, we could even use wiki-magic to show the title of the page as the Comic name, but the URL as the number - in order to parallel the actual XKCD website. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 17:09, 2 August 2012 (EDT)
:: Shouldn't there be a way to programmatically find the comic with the highest number that has a page with content? That would work as long as no one puts future comic pages up. --[[User:Jeff|Jeff]] ([[User talk:Jeff|talk]]) 20:25, 1 August 2012 (EDT)
:::It's all sounding like folks are over-complicating something quite easy. All I'm suggesting is a prominent link to http://www.xkcd.com/. No need, I think, to list which number the latest is, or include the next/last/random buttons, etc. [[User:Christopher Foxx|- CFoxx]] ([[User talk:Christopher Foxx|talk]]) 11:41, 3 August 2012 (EDT)
::::Oh. We've got that, now, in the sidebar - labeled as "XKCD." I do think that having an internal link to the latest (explained) comic would be a great thing, though. --''[[User:Philosopher|Philosopher]]'' [[User talk:Philosopher|Let us reason together.]] 16:36, 4 August 2012 (EDT)

You can transclude the latest comic on the main page like this: <nowiki>{{:pagename}} e.g. {{:Internal_monologue}} </nowiki>--[[User:SurturZ|SurturZ]] ([[User talk:SurturZ|talk]]) 00:25, 2 August 2012 (EDT)
: I've started with just a manual link to the latest comic. Ideally it will be automatic, but a manual link will work for now as I've had quite a few people ask for it. --[[User:Jeff|Jeff]] ([[User talk:Jeff|talk]]) 21:09, 1 August 2012 (EDT)

Transclusion of the latest comic is great. Someone with the right permissions should add (for instance on the top-right corner of the grey transclusion area) a link to edit the corresponding wiki page, so that people seeing something they could add would feel invited to do so (wiki style). In my opinion this would be a good way to improve the quality of the user-generated explanations.
Also, all the "XKCD"s in the "New here?" section should be converted to the lowercase "xkcd"...
[[User:Cos|Cos]] ([[User talk:Cos|talk]]) 14:00, 6 August 2012 (UTC)
:Good points. I've done both. --[[User:Waldir|Waldir]] ([[User talk:Waldir|talk]]) 15:48, 6 August 2012 (UTC)

Call me dumb, but... You've got a link called "prev" that goes to the explaination for the previous comic. Then a link called "comic #42" but that goes to xkcd. And then a smaller, less prominent link called "go to this comic" that doesn't go to the comic but to its explaination. Anyone else think that's a little back-to-front? [[User:Zootle|Zootle]] ([[User talk:Zootle|talk]]) 17:18, 31 August 2012 (UTC)
:OK, you're dumb :-). The standard template for an explanation page includes the header with "Prev", "Comic # (date)", and "Next" links. If we don't have explanation pages for the previous or next comic, we don't show the respective link. I hadn't noticed that the "Comic # (date)" bit was a link to the xkcd site before, but in context it makes sense to me. Including a link to the Explain page for the comic who's explain page you are already looking at doesn't make sense.
:The explanation page for the latest comic is "transcluded" in the main page pretty much as-is, so we get the header, the comic, the explanation, etc. We don't get the discussion, which is visible at the bottom of the Explain page. Because there is never an explanation for a comic that hasn't been released yet, there is never a "Next" link on the main page's transcluded header. So you get "Prev" and "Comic" links. The "Go to this comic" link is added by the main page above the transcluded explain page.
:I can see how the "Go to this comic" link might be poorly worded especially as it's placement seems to be within the explanation it's linking to. [[User:Blaisepascal|Blaisepascal]] ([[User talk:Blaisepascal|talk]]) 18:16, 31 August 2012 (UTC)
::Rather than "Go to this comic" maybe it could be "Go to full explanation" ? Something else? [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 13:38, 5 September 2012 (UTC)
::There was [http://www.explainxkcd.com/wiki/index.php?title=explain_xkcd:Community_portal/Admin_requests#.22Edit_this_explanation.22_link_on_main_page a discussion at one point] about a wittier/more descriptive link - but no one came up with anything. I do like "Go to Full Explanation" better, for what it's worth. --[[User:DanB|DanB]] ([[User talk:DanB|talk]]) 15:31, 5 September 2012 (UTC)
:::My problem with that suggestion is that it implies that the main page explanation is not full. As of right now, the full explanation is transcluded on the main page. There's nothing more to see by clicking that link (explanation wise) Perhaps "Go to full explanation page" but that doesn't quite sound right to me... [[User:TheHYPO|TheHYPO]] ([[User talk:TheHYPO|talk]]) 15:42, 7 September 2012 (UTC)
::::How about "Go to this Comic Explanation Page"? One nice thing about the specific page rather than the [[Main_Page]] transcoding is that it nicely includes the discussion as well. I have a bookmark to the [[Main_Page]] that I look at every day, but I want to easily read the discussions, not only the explanation. Humm, maybe we could have a page [[most recent comic]] that automagically redirects to the most recent comic? [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 12:42, 8 September 2012 (UTC)
:::::I tried to get [[most recent comic]] to redirect to LATESTCOMIC, but can't get the syntax working - it is possible? [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 13:03, 8 September 2012 (UTC)
::::::Apparently it isn't. I would have tried <code><nowiki>#REDIRECT [[{{LATESTCOMIC}}]]</nowiki></code> like you did, but since that doesn't work, I'll delete the page for now. --[[User:Waldir|Waldir]] ([[User talk:Waldir|talk]]) 16:38, 20 November 2012 (UTC)

== Discussion of latest comic ==
Perhaps include the discussions of the latest comic here? I almost missed there was a discussion field a few times because I would only read about the latest comic on the main page. [[User:Carewolf|Carewolf]] ([[User talk:Carewolf|talk]]) 14:54, 22 September 2012 (UTC)

This comics's explanation is complete bollocks, I think. Of course it is NOT a "fact that such a room exists". This comics parodies trope often used in cop movies - an elderly cop goes to work for the last time before his retirement, packs things, plans fishing the next day ... only to be called to one more case (possibly with a new, young and brash partner). And despites his efforts not to screw anything and stay clear of danger, he is either mortally wounded or screws big time and is degraded. So much clichè, that if someone says "It's my last day or service", you might be sure one of the two options above happens. See http://tvtropes.org/pmwiki/pmwiki.php/Main/Retirony [[User:edheldil|Edheldil]] 10:17, 26 September 2012 (UTC)

I believe this link maybe relevant: http://en.wikipedia.org/wiki/Turtle_graphics {{unsigned|Rhudi}}

I went ahead and filled out the bracket from today's (see edit date) comic: http://m.imgur.com/gallery/WyPkHx2 {{unsigned|Glaucon81}}

*rise

Btw, why wouldn't I just enter "ipconfig free" if I didn't want my IP address showing? {{unsigned ip|172.68.65.48}}

== The comic explanation count is wrong ==

The adjustment is currently 3, but there are now 6 subcategories and one list making the current correct adjustment 7.
If the wiki was upgraded to version 1.20, a form exists to automatically exclude subcategories.
--[[User:Divad27182|Divad27182]] ([[User talk:Divad27182|talk]]) 09:56, 8 October 2012 (UTC)

:Looks like another week of the wiki going down then.
:But seriously, I've been noticing this too. Didn't know what was causing it, but it's going to have to be fixed sometime.[[User:Davidy22|Davidy22]] ([[User talk:Davidy22|talk]]) 10:25, 8 October 2012 (UTC)

::The text reads <pre><nowiki>We already have [[:Category:Comics|'''{{#expr:{{PAGESINCAT:Comics}}-3}}''' comic explanations]]!</nowiki></pre> The -3 is to account for the subcategories and non-explanation pages in the category. There apparently used to be three such pages, and now there are seven. I would fix this myself, but the page is protected. If the wiki where upgraded to version 1.20, the categories could be explicitly excluded, but the [[List of all comics]] would still be in the category. (Note that the -3 actually appears twice.) --[[User:Divad27182|Divad27182]] ([[User talk:Divad27182|talk]]) 05:03, 11 October 2012 (UTC)

:::Mediawiki 1.20 fixes this issue, although it'd be nice if this could be fixed in the meantime via the hack reccommended by divad. [[User:Davidy22|Davidy22]][[User talk:Davidy22|<tt>(talk)</tt>]] 06:40, 16 November 2012 (UTC)

:Looks like Waldir updated the "Comic Correction Count" to "10" (as of 20 November 2012):
<nowiki> We already have [[:Category:Comics|'''{{#expr:{{PAGESINCAT:Comics}}-10}}''' comic explanations]]!</big>
Note: the -10 in the calculation above is to discount subcategories (there are 7 of them as of 20 November 2012),
non-comic pages (2 as of same date: [[List of all comics]] and [[Exoplanet]])
and the comic 404, which was deliberately not posted. Thus 7 + 2 + 1 = 10
(But there are still {{#expr:{{LATESTCOMIC}}-({{PAGESINCAT:Comics}}-10)}} to go. Come and [[List of all comics|add yours]]!)</nowiki>
:Could we possibly make this more dynamic by creating a "IGNORE_IN_COUNT" category or something? and then using something like: <nowiki>{#expr:{{PAGESINCAT:Comics}}-{{PAGESINCAT:IGNORE_IN_COUNT}}}</nowiki>? Then any additional entries to the "Comics" category (that are 'special' entries) could just have the special category added and no main page editing would be necessary? --[[User:Bpothier|B. P.]] ([[User talk:Bpothier|talk]]) 07:50, 22 November 2012 (UTC)

==Make Jeff stop apologizing==
The apology for server downtime has been around for a while now. Can we take it down? [[User:Davidy22|Davidy22]] ([[User talk:Davidy22|talk]]) 04:41, 11 October 2012 (UTC)

== Spambots ==

I think someone should install [http://www.mediawiki.org/wiki/Extension:AbuseFilter AbuseFilter]. --[[User:Kronf|Kronf]] ([[User talk:Kronf|talk]]) 10:09, 13 October 2012 (UTC)

== Purge ==

We should regularly purge the server's cache for the main page using http://www.explainxkcd.com/wiki/index.php?title=Main_Page&action=purge to keep the explanation up to date. --[[User:Kronf|Kronf]] ([[User talk:Kronf|talk]]) 02:28, 3 November 2012 (UTC)

== Updating the Rules ==

I've been having a lovely discussion with someone who apparently thought the "edit anything you want" rule applied to the Talk pages. As we don't have any codified rules for ''here'' and can only point to "well the canonical way this is done on Wikipedia is..." I think that there are a few things we need to put into the list of Rules on the front page, and then have a link to a more in-depth talk about why the rules exist and what-not.

Specifically, I'm talking about writing "Feel free to edit any page on the wiki to be better. But, treat talk pages like you would blog comments: comments by other people ''cannot be changed by you'', you can only respond to them." as a new rule to be plastered on the front page, as there seems to be an increasing number social neophytes that seem to think that editing words that are attributed as being said by another person is perfectly legitimate and non-controversial.

Shall we discuss? [[User:Lcarsos|lcarsos]]_a ([[User talk:Lcarsos|talk]]) 01:25, 15 November 2012 (UTC)

:We could add the etiquette rules as an addendum to the signature reminder at the top of the page. Just an extra note below the alert box asking people to not edit other people's comments. [[User:Davidy22|Davidy22]][[User talk:Davidy22|<tt>(talk)</tt>]] 06:40, 16 November 2012 (UTC)

::It really should be right down with the "edited mercilessly" description, because this is an exception to that statement. Shouldn't have two sets of contradictory instructions in different places. When I made my improper edit, I had a semi-conscious moment of doubt about whether changing the other guy's comment was ok, even though this is a wiki (and even though it wasn't really clear to me that this "discussion" box held something totally separate from the page content), but that statement at the bottom put all such doubts to rest. I read it multiple times to be sure. But I did not notice that line at the top about the four tildes until ''much'' later. It's somewhat lost, visually, in the header line, when you're not looking directly at it.[[Special:Contributions/50.0.38.245|50.0.38.245]] 18:32, 18 November 2012 (UTC)

:::There's discussion to replace that message with a more noticeable alert box. The message at the bottom of the page appears for all pages, including talk pages, so a talk-page specific message there would not entirely fit. [[User:Davidy22|Davidy22]][[User talk:Davidy22|<tt>(talk)</tt>]] 00:18, 19 November 2012 (UTC)

::::If that text at the bottom is in fact alterable, it should be written to take every case into account. It's an extremely poor user interface that has instructions appearing on a page stating rules that are the exact opposite of reality. And note that the altert box on the top looks a lot like a banner add, when you don't focus on it and read it. People will tend to habitually filter out anything written there from their perception. Also, it can easily be scrolled off the top of the screen when the discussion starts to get long, and they have a preview displayed.
::::So I think after the "...then do not submit it here.", it should add, "'''Exception''': others' comments in Discussion pages are not to be altered. See full rules at <<link to appropriate wikipedia page>>."[[Special:Contributions/50.0.38.245|50.0.38.245]] 15:46, 28 November 2012 (UTC)

== Update after changes ==

The front page explanation hasn't been updated at all day to match changes in the explanation on the comic's page. This is a major problem i think, as it is the front page explanation people visitors will most often read. --[[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 20:43, 26 November 2012 (UTC)
: It might be a caching issue. Appending <code>&action=purge</code> to the URL will probably fix it. Can you confirm it looks good to you now? --[[User:Waldir|Waldir]] ([[User talk:Waldir|talk]]) 00:29, 27 November 2012 (UTC)
::Yep, now it updates instantly! Well done, whatever you did! :) --[[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 16:24, 27 November 2012 (UTC)

:::I've also added a link underneath the comic box that has the action embedded, so no one has to do any manual URL hacking. [[User:Lcarsos|lcarsos]]_a ([[User talk:Lcarsos|talk]]) 17:38, 11 December 2012 (UTC)

::::Just wanted to check in on this - are there issues with automated systems or spammers following this link? I know it can affect performance - caching is important on a busy site! --[[User:Overand|Overand]] ([[User talk:Overand|talk]]) 22:37, 13 September 2013 (UTC)

== Suggestion: Change "Go to this comic" to "Go to this entry" ==

Just a small suggestion. For the Main Page, I suggest changing "Go to this comic" to say "Go to this ''entry''" instead to remove any confusion for new and regular viewers. It certainly took me a while to figure how to go to each featured comic's entry from the main page.

[[Special:Contributions/69.43.114.2|69.43.114.2]] 17:04, 11 December 2012 (UTC)

:How about if it reads "Go to this comic explanation"? Would that be less confusing? I only quibble because the explanations aren't really entries, in wiki parlance each page is usually called an article, but that doesn't seem to fit here as we really have explanation pages. [[User:Lcarsos|lcarsos]]_a ([[User talk:Lcarsos|talk]]) 17:41, 11 December 2012 (UTC)

::Agreed. [[User:Ctxppc|Randy Marsh]] ([[User talk:Ctxppc|talk]]) 22:55, 8 January 2013 (UTC)

== Explain the Unreleased Comic? ==
:I wonder if [[http://i56.tinypic.com/a9ton8.png this comic]] is permitted to be explained, despite the double issue of Randall pulling the comic plus me finding the pulled comic through "xkcd overrated"... [[User:Greyson|Greyson]] ([[User talk:Greyson|talk]]) 18:21, 12 December 2012 (UTC)

== Comic 1156 ==

I don't have an account to edit the page directly, so here's an edit someone should make:
It looks like whoever wrote the existing page simply googled 'conditioning' and found the first link that came up.
Please modify the link to point to 'Classical conditioning', not 'Operant conditioning'.
Thanks. {{unsigned ip|124.191.56.91|05:26, 7 January 2013‎ (UTC)}}

:Hi. This is the talk page for the main page of the wiki. This page only has a "view" of the actual comic explanation. The actual explanation page is at [[1156: Conditioning]], and I assure you, edit permissions have not been restricted for that page. Someone has already changed the page to link to Classical conditioning, but the original editor came back stating that Operant was correct. If you would like to start a discussion about this [[Talk:1156: Conditioning|on the talk page for this explanation]] that would be much more conducive to getting this matter settled. [[User:Lcarsos|lcarsos]]_a ([[User talk:Lcarsos|talk]]) 05:52, 7 January 2013 (UTC)

== Comic Links ==

Some of the links seem to be confusing, as they're titled in a weird way. The link/button 'go to this comic', I'd expect would go to the actual comic on XKCD's page. Yet it goes to the comic's wiki page. And clicking on the comic # and date directs you to the XKCD page, yet I really feel that link should go to the wiki page, as it's right at the top center there, and has the date and everything, sort of indicating that it's a wiki page, yet it's not. And the prev and next buttons next to it don't go to the xkcd page, they go to the wiki pages. Which is really messed up, I think. Because of my confusion, every single time I visit here, I clicked on the wrong link, though now I've gotten used to it. I suggest rewording the links as 'XKCD Comic # and date' and 'go to this comic's wiki page'. And possibly switching the links' positions so that the wiki links could be in that navigation bar and the XKCD links could be off to the side. After all, we are a wiki, so putting our wiki links to the comic off to the side and the direct xkcd link in the center seems odd. Anyway, has anyone had the same thoughts and/or agree with me on this?--[[Special:Contributions/69.119.250.251|69.119.250.251]] 18:19, 9 January 2013 (UTC)

== Unexplained comics ==

The template that starts each explanation page should be edited to have the next and previous buttons automatically skip over pages that don't exist, rather than simply not being there if comic n+1 or n-1 doesn't exist. Preferably it would append a notice to the next page (like the redirect notices commonly found on mediawiki) telling you how many comics have been skipped. I'm not sure how feasible this would be to script, however. [[Special:Contributions/130.160.145.185|130.160.145.185]] 23:45, 9 March 2013 (UTC)

== Percentage of remaining comics calculation is off... ==

Okay, I hate to be "that pedantic math guy", but... Today the main page reads "We have collaboratively explained 936 xkcd comics, and only 252 (27%) remain." While I agree that 252/936 is roughly 27%, I believe we should really be calculating the percentage as "the number left to explain" divided by "the total number of comics that exist", not divided by "the number we have finished". That is (today), 252/1188=21%. Think about it. If we had completed 594 comics today, with 594 remaining, what should the percentage be? 594/594=100%? That's not right... 594/1188=50%? That's what we really want to say.

The page is protected, which makes sense. So I'll make my suggestion here.

Change this:

<pre>
and only {{#expr:{{LATESTCOMIC}}-({{PAGESINCAT:Comics}}-9)}}
({{#expr: ({{LATESTCOMIC}}-({{PAGESINCAT:Comics}}-9)) / ({{PAGESINCAT:Comics}}-9) * 100 round 0}}%)
remain.
</pre>
To this:
<pre>
and only {{#expr:{{LATESTCOMIC}}-({{PAGESINCAT:Comics}}-9)}}
({{#expr: ({{LATESTCOMIC}}-({{PAGESINCAT:Comics}}-9)) / {{#expr:{{LATESTCOMIC}}}} * 100 round 0}}%)
remain.
</pre>
[[User:Imperpay|Imperpay]] ([[User talk:Imperpay|talk]]) 15:32, 20 March 2013 (UTC)

:Done and done. '''[[User:Davidy22|{{Color|purple|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 15:37, 20 March 2013 (UTC)

:Thanks for the heads-up! However, notice that the #expr: around LATESTCOMIC was unnecessary. I've removed it. [[User:Waldir|Waldir]] ([[User talk:Waldir|talk]]) 11:30, 21 March 2013 (UTC)

::Waldir, you have exposed me as a charlatan and a fool! (I just copied, pasted, and tinkered until I made something that worked. I don't actually understand it. No formal training, you see. It's what we used to call "hacking" back in the dawn of the digital era, before the word took on connotations of vandalism, trespassing, and fraud. Have you kids come up with another word for it?) [[User:Imperpay|Imperpay]] ([[User talk:Imperpay|talk]]) 13:59, 22 March 2013 (UTC)

::: Joke's on me then, 'cause you sure fooled me – I readily assumed you knew your way around those parser functions. Nice job hacking the code, it was a nearly perfect crime ;) --[[User:Waldir|Waldir]] ([[User talk:Waldir|talk]]) 03:26, 25 March 2013 (UTC)

:::I've heard the cool kids call that the "Maker Mentality", usually with a reference to [http://makezine.com/ Make magazine] and [http://makerfaire.com/ Maker Faire]. But I think there's also a movement to resurrect the original meaning of hacker. [[User:Lcarsos|lcarsos]]_a ([[User talk:Lcarsos|talk]]) 04:21, 25 March 2013 (UTC)

==sidebar ads?==
''Moved to [[explain xkcd:Community portal/Proposals]] –– [[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 08:06, 4 May 2013 (UTC)''

== Expression error on Main Page ==

Please use <code><nowiki>{{PAGESINCAT:...|R}}</nowiki></code> instead of <code><nowiki>{{PAGESINCAT:...}}</nowiki></code> to correct these errors :) --[[Special:Contributions/110.168.83.62|110.168.83.62]] 10:55, 8 April 2013 (UTC)
:Dun diddly done. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 11:21, 8 April 2013 (UTC)

== Compile a list of non-technical comics to non-technical readers? ==

I'm a long-time reader and fan of >< |< C |}, but my normal approach is useless when I introduce this provocative comic series to my less technical friends. They stay at the apparent level of many comics. They don't bother reading the explanations, but they would say, "it's hard to make sense". Imagine an average non-technical (and non-arts) major guy/girl, can we compile a list of state-of-the-art but less-technical, easy-to-comprehend but "ah ha!!" strips that is suitable for them? --[[User:FrenzY|W shll nvr flly xpln xkcd!]] ([[User talk:FrenzY|talk]]) 12:39, 18 May 2013 (UTC)
:Oh my god that signature.
:Gaah, derailment. Uh, pretty much anything that isn't tagged with the physics or math categories are easy enough to understand for the average English speaker, so just check the categories at the bottom of the page for that. Also, avoid comics with the incomplete tag, and that oughta be fine. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 14:41, 18 May 2013 (UTC)

== Quit building? ==
''This post was moved to [[Talk:1214: Geoguessr]].''

:Hello, this is the talk page for the content of the front page of the wiki, not for discussion of the most recent comic, that happens [[Talk:1214: Geoguessr|here]]. I've moved your post over there for you. Cheers, and welcome to explain xkcd! [[User:Lcarsos|lcarsos]]_a ([[User talk:Lcarsos|talk]]) 05:09, 22 May 2013 (UTC)

== List of incomplete comics ==
We need a link to the "Incomplete articles" at the main page below the "Missing link". Most pages are created but many are incomplete.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:06, 7 June 2013 (UTC)

== Header message ==

'''Please don't take this seriously unless you actually think it's a good idea:'''

I think the header should be changed from "explain xkcd: It's 'cause you're dumb." to "explain xkcd: It's 'cause you're dumb... or still have some hope that comic [[1190]] will end." or something similar. [[User:Schiffy|Schiffy]] ([[User_talk:Schiffy|Speak to me]]|[[Special:Contributions/Schiffy|What I've done]]) 14:53, 9 June 2013 (UTC)

::Nope! This page is trying to explain more than 1222 comics, not only [[1190: Time]]. The header just states the truth.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 15:49, 9 June 2013 (UTC)

I'd vote for a change. People have started coming over to discuss the comic even when they've 'gotten' it. That, and the fact that this is one step ahead of Googling the references yourself. So.. maybe, "it's because you're dumb..and lazy."[[Special:Contributions/220.224.246.97|220.224.246.97]] 02:26, 31 August 2013 (UTC)
:I honestly don't think it either. This is the most comprehensive comic-by-comic Wiki. People don't come here because they're dumb ''or'' lazy. That's like saying I'm dumb for reading a review of an episode after I've watched it - I'm interested in seeing what other people up with or caught that I didn't. It denigrates the idea of aggregating information, which is a very un-XKCD idea.

As a regular reader of explainxkcd (who was to lazy to cotribute anything until now), I'd like to support the proposed edit. (... and lazy) It really fits to the tone of our favourite waste of otherwise productive time (which is xkcd for myself). Best wishes from Heidelberg, Germany. --[[Special:Contributions/147.142.13.86|147.142.13.86]] 14:38, 10 October 2013 (UTC)

A friend that happens to be blind hates this site because of the "It's cause you're dumb" tagline. If he wants a transcript of the comic on xkcd, his option is to come here and have his screen reader program telling him that he is dumb every single time.

How about, "explain xkcd: because sometimes we all need a little help."? -- [[Special:Contributions/173.245.54.65|173.245.54.65]] 02:07, 8 February 2016 (UTC)

:Oh, hadn't thought about that. There's been recurring complaints about this over the years, though the tagline's been around since before we were a wiki. I'll write something up and put this to a vote. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 09:00, 8 February 2016 (UTC)

== A point of confusion ==

Why is 'Apatosaurus' a category but 'Internet Argument' no longer a category? [[User:Greyson|Greyson]] ([[User talk:Greyson|talk]]) 13:53, 20 June 2013 (UTC)
:Cuz people hit the random button, see an Apatosaurus feature in three comics and figure it must be a recurring theme. Same as the internet argument thing. Will get round to a category purge after we've cleared out all the incomplete tags. I think there's one for ferrets hidden away somewhere in the dark recesses of our catalog of categories. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 14:45, 20 June 2013 (UTC)
::On the subject, can I suggest a "Barred from Conferences" category, or similar? That's definitely a recurring theme (for a long, long time), and thus should be justified enough. I'd be happy to add various qualifying articles as I scroll through again, if I can, but first I'll leave it up to someone else to solidify the actual name. (In case it turns out not to be just conferences, for example.) [[Special:Contributions/178.98.31.27|178.98.31.27]] 16:27, 22 June 2013 (UTC)

== Incomplete comics statement ==

I suggest the minor change: "We have an explanation for all x xkcd comics, and only y (y/x %) are '''marked as''' incomplete." –[[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 08:07, 21 June 2013 (UTC)

== 1262 is out ==

So what are you waiting for? [[Special:Contributions/75.60.27.102|75.60.27.102]] 06:25, 9 September 2013 (UTC)
:<nowiki>(diff | hist) . . N 1262: Unquote‎; 06:23, 9 September 2013 (UTC) . . (+322)‎ . . ‎Davidy22 (Talk | contribs | block)‎ (Created page with "{{comic | number = 1262 | date = September 9, 2013 | title = Unquote | image = unquote.png | titletext = I guess it's a saying from the Old Country. }} ==Expl...")</nowiki>
:Examine the time stamps. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 06:30, 9 September 2013 (UTC)

== Adverts ==

I am not going to disable my adblock, I hate ads. If you accept bitcoin I can make a donation though. [[Special:Contributions/184.66.160.91|184.66.160.91]] 05:24, 27 September 2013 (UTC)
:Our ads are always easy-to-load images as opposed to flash ads, they're always pointing to some valuable product of some form and we've looked at and approved all of them. They also occupy space that would otherwise have been empty, as our one ad is bound strictly to the sidebar. We used to have a paypal donation button, but it was pitifully tended to and a much less reliable source of income than ads. Ads are the only reliable business model for small sites like this one; unless our readers suddenly become willing to pay all our server costs for us, we can't feasibly afford a better hosting plan without ads. We legally aren't allowed to open a merch store, because that infringes on Randall's shop, and we haven't had a single generous benefactor yet. If you want to stop seeing our server error messages, loosening up adblock for us and contributing to our impressions count will help us massively. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 06:00, 27 September 2013 (UTC)

I don't care about your server message, I wanted to make a donation. Sooo, you don't want any bitcoins? [[Special:Contributions/37.221.161.235|37.221.161.235]] 07:16, 27 September 2013 (UTC)
:This took a bit of digging. We're fine with bitcoin donations, it's just that at the rate donations came in, they were just not enough to pay for anything. [https://coinbase.com/checkouts/b19f921822ac962807a8f72d51509e59] '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 20:34, 28 September 2013 (UTC)

Donation made! [[Special:Contributions/184.66.160.91|184.66.160.91]] 23:23, 30 September 2013 (UTC)
:Thanks! '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 02:27, 1 October 2013 (UTC)

Am I the only one that feels it is "wrong" that the explainxkcd site has ads and the real xkcd doesn't have any? It feels like someone is profiting off of Randall's work. Does he officially endorse this website? Do any proceeds help go to support his ongoing publication of an awesome comic? [[Special:Contributions/173.245.54.19|173.245.54.19]] 16:01, 7 July 2015 (UTC)

:An admin will be able to give you more detail than me, but explainxkcd has a significant number of visitors (and thus hosting costs), and no way to generate income other than donations and ads. In contrast, Randall makes money from his comics by way of books and merchandise (and possibly public speaking), some of which will pay for his hosting. He could choose to have ads on his site to generate additional income, its his choice not to. I have no knowledge of the finances of explainxkcd, however I doubt there is much/any surplus ad revenue being pocketed by the owners/admin. As far as the site being officially endorsed, not as far as I'm aware, no.
:Also, for more discussion on adverts/income, see [http://www.explainxkcd.com/wiki/index.php/explain_xkcd:Community_portal/Proposals#Sidebar_ads here].--[[User:Pudder|Pudder]] ([[User talk:Pudder|talk]]) 16:21, 7 July 2015 (UTC)

== /wiki is returning a 403 ==

Hello, 
http://www.explainxkcd.com/wiki/ is returning a 403 now. In my eyes you should redirect it to the main-page instead :-). --[[User:DaB.|DaB.]] ([[User talk:DaB.|talk]]) 12:41, 8 November 2013 (UTC)
:We have a new, hopefully better, server. The problem is already reported to [[User_talk:Jeff#Forbidden]] --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 14:22, 8 November 2013 (UTC)

== Explain Explain XKCD / Explain^2 XKCD ==

This particular comic explanation requires explanation. Way too many potential cross references with each conjecture requiring its own explanation page. Dial it back a little. {{unsigned ip|108.162.245.11}}
:Uh, sorry, could you clarify that a little? '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 07:23, 19 November 2013 (UTC)

::He is talking about the [http://www.explainxkcd.com/wiki/ http://www.explainxkcd.com/wiki/] issue. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 21:32, 19 November 2013 (UTC)
:::Well if it's that, that's an intentional permissions setting on a URL that no-one is feasibly going to type. Unless you can come up with a better use for that URL, with a reason? '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 08:40, 20 November 2013 (UTC)
::::A symlink to "index.php" at the root folder would solve the problem.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 09:26, 20 November 2013 (UTC)
:::::I cannot believe how many weeks that took to fix. Amazing. No one was going to type it, but everyone was going to get redirected to it from the home page! [[Special:Contributions/108.162.222.227|108.162.222.227]] 11:37, 20 November 2013 (UTC)

The problem is still not solved. [http://www.explainxkcd.com/wiki/ http://www.explainxkcd.com/wiki/] gives still a 403 error because "index.php" is not included in the http server configuration as a default index page. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 20:07, 20 November 2013 (UTC)
:: I've fixed this. Sorry about the delay. Was super busy! --[[User:Jeff|Jeff]] ([[User talk:Jeff|talk]]) 16:02, 21 November 2013 (UTC)
:::Thanks Jeff, it's working. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:20, 21 November 2013 (UTC)

== Webmaster: Obtrusive video ad on your site ==

In the ad section I saw a box sticking out and blocking out the explanation. This was therefore a very obtrusive botched video ad. Please remove this ad from your site. [[Special:Contributions/199.27.128.188|199.27.128.188]] 22:29, 6 June 2014 (UTC)

EDIT: It's now sticking out and preventing me from clicking on the "Save page" button. [[Special:Contributions/199.27.128.188|199.27.128.188]] 22:29, 6 June 2014 (UTC)
:We only accept GIFs for moving ads. Ads should also be contained within the sidebar as they're techonogically restricted to standard-sized PNGs and GIFs, so an extruding ad would be a CSS error on the site end/browser error. In addition, we run ads from lots of advertisers, and "this ad" is not specific enough to tell us which ad you want us to remove. Could you provide a screenshot/link/more information? '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 22:54, 6 June 2014 (UTC)

== Adding an arcs list page ==

I think there should be a page listing all webcomics arcs so far (the red spiders, the race, etc.)[[Special:Contributions/188.114.102.134|188.114.102.134]] 12:47, 2 October 2014 (UTC)

:This already exists, see [[:Category:Comic series]]. --[[User:Waldir|Waldir]] ([[User talk:Waldir|talk]]) 05:39, 10 April 2015 (UTC)

== This explanation may be incomplete or incorrect: link ==

This has been bothering me for a while now. Why does the link in the info box for the main page link to editing the main page? It needs to link to the editing of the page which the comic's explanation is on. When I would like to edit the latest XKCD explanation, I click that thinking I am going to edit the explanation, but instead I am led to editing the main page. [[User:Auraxangelic|Auraxangelic]] ([[User talk:Auraxangelic|talk]]) 15:19, 24 October 2014 (UTC)
:Ooooooh, nice catch. I've actually never noticed that before, and it's definitely not intentional. It happens because the text of the explanation page is folded into the main page before mediawiki parses links and syntax, and the "Edit this page" button links to the page that the link is on. I have an idea for how to fix it though, so I'll get on that. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 01:49, 25 October 2014 (UTC)

== #1454 - bad description ==

"Curly-hair states longingly..." She comes across as disappointed (or even heartbroken), not "longing", which suggests sounding somewhat positive and energetic, rather than deflated. [[Special:Contributions/141.101.99.88|141.101.99.88]] 22:29, 2 December 2014 (UTC)

==Cueball/Rob merge==

It seems to me from a general reading of the comics that Randall has always intended for the character we here call "Cueball" to have the name "Rob". Much as "Cutie" was renamed "Megan" when we learned her name, and now she is identified as "Megan" even in comics where her name is not explicitly mentioned, I think we should consider merging the "Cueball" and "Rob" articles. I know there's a lot of inertia here, but it seems to me that this is Randall's intention for the character's name. [[User:Djbrasier|Djbrasier]] ([[User talk:Djbrasier|talk]]) 13:38, 10 March 2015 (UTC)
: Alternatively, we should un-merge [[Megan]] and [[Cutie]] for consistency. [[User:Djbrasier|Djbrasier]] ([[User talk:Djbrasier|talk]]) 14:50, 10 March 2015 (UTC)
: I'm pretty sure this is an augmentation of the author's internal characters, including the one he has developed involuntarily as to the nature of his love. His memory of his love is not his love, yet it is what he has to love. Randall seems the type to delve into this, and thus I am in support of keeping the character names as they stand. /eof [[Special:Contributions/173.245.56.185|173.245.56.185]] 05:43, 25 March 2015 (UTC)

== Kerbal Space Program ==

I'm a schizophrenic who's been playing Kerbal Space Program for about five days with no sleep, and I'm pretty sure this is a reference to [https://www.google.com/search?q=xkcd+kerbal+space+program&oq=xkcd+kerbal+space+program&aqs=chrome..69i57.10851j0j7&sourceid=chrome&es_sm=122&ie=UTF-8 comic 1365] :D [[Special:Contributions/173.245.56.185|173.245.56.185]] 05:39, 25 March 2015 (UTC)

== 1509 is missing ==

When will it be added? By bot, I presume.--[[User:17jiangz1|17jiangz1]] ([[User talk:17jiangz1|talk]]) 04:51, 8 April 2015 (UTC)

== Broken Date Box on comics ==

The "Comic #1511 (April 13, 2015)" textbox that appears on top of each comic breaks if you shrink the screen. I think the space after the comma needs to be replaced with a non breaking space.{{unsigned ip|108.162.238.144}}

:Is it fixed now? '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 20:59, 13 April 2015 (UTC)

::It looks like it. I had pointed it out once before and it was fixed. I guess somebody reverted that change or something... --[[Special:Contributions/173.245.56.202|173.245.56.202]] 13:42, 15 April 2015 (UTC)

== 1515? ==

Is it correct that we have 1515 comics, as of April 15, 2015? --[[Special:Contributions/173.245.48.122|173.245.48.122]] 05:20, 15 April 2015 (UTC)
:It's not, but some people insist on making comic pages for things that aren't comics. I'll fix that. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 06:27, 15 April 2015 (UTC)

== 972 is broken ==

Look, I'm not going to make an account here or anything, but I just wanted to point out that trying to access the page for comic #972 leads to a database error, and maybe someone should check on that. [[Special:Contributions/173.245.48.102|173.245.48.102]] 07:45, 14 July 2015 (UTC)

Actually a lot of other pages lead to that same error as well... Even the 'Technical Diskussions' sub-page is broken. Seems to my, like some swap-spac needs cleaning up? [[Special:Contributions/108.162.230.83|108.162.230.83]] 10:32, 14 July 2015 (UTC)
:Yep. It's a symptom of another problem, but the errors should be cleared up now. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 16:31, 14 July 2015 (UTC)
::No dice. [[997]] is still broken. --[[Special:Contributions/198.41.235.119|198.41.235.119]] 00:27, 3 August 2015 (UTC)

:::Looks like they're working now. 21:01, 2016-11-27 {{unsigned ip|141.101.98.163}}

== #1567 ==

I think the current explanation is missing the connection, and the parody of, many "As Seen On TV" commercials selling kitchen products. Many of these commercials show people trying to use common kitchen equipment (pots, pans, can openers, etc) in a way that no normally functioning human would do it (for example, one has a lady draining the liquid from a pot of food into a sink in an extremely awkward manner — one that no normal person who has ever seen a kitchen would do — but then the lid flies one way, food goes another, there's a huge mess, etc; another commercial has someone trying to open a can of food using a can opener '''backwards''', with the woman looking extremely confused looking on how the can opener is supposed to be used or attached to the can [if you told someone act like they are a clueless monkey trying to use a can opener for the first time, that's basically what the commercial had the woman doing — no joke]). These commercials often begin with phrases such as "If you are like me" or "If you are like most home makers" or some other closely related "If you are like..." phrase (thus this comic is directly tieing itself to these commercials using this catch phrase). [[Special:Contributions/108.162.220.11|108.162.220.11]] 07:50, 21 August 2015 (UTC)
:: Other opening catch phrases for these commercials include the "Tired of [fill-in made-up frustration]" and the "Do you [fill-in made-up frustration]" kind. [[Special:Contributions/108.162.220.11|108.162.220.11]] 08:09, 21 August 2015 (UTC)

== "I used Google news BEFORE it was clickbait" ==

Go to a handful of older pages on this wiki, and it won't be long before you see this phrase in the comments - [[941: Depth Perception]], for instance has two of them. Does anyone know why this happens? [[Special:Contributions/108.162.221.116|108.162.221.116]] 10:59, 23 August 2015 (UTC)
:That's the signature of a person who used to post here. If you click through, it actually goes to a userpage. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 14:25, 23 August 2015 (UTC)

== URL ==

I notice that whenever you add "explain" to an xkcd url, it takes you here! neat! [[Special:Contributions/198.41.235.233|198.41.235.233]] 23:13, 28 August 2015 (UTC)
:Someone noticed! Finally! '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 04:45, 29 August 2015 (UTC)

== Should we really be using CC-BY-SA? ==

Don't get me wrong, CC-BY-SA is my favorite creative commons license. The problem is, are we really allowed? The reason I'm worried is that I'm not sure if what we are doing really counts as "fair use" with respect to XKCD. It would probably be better to do CC-NC-BY-SA, to respect XKCD, or at least put a note that CC-BY-SA only covers the wiki portion (since it's probably too late to do CC-BY-SA anyway).
[[Special:Contributions/173.245.54.37|173.245.54.37]] 23:38, 27 January 2016 (UTC)
:This is a tough one. Mediawiki sites generally use CC-BY-SA, even if the content they're based off is copyrighted (Wikia sites for various topics do this). The license only does apply to content ''created'' here. What should probably be done, if it isn't already, is some specification on pages in the <code>File:</code> namespace indicating that they are owned by someone other than the owners of this site. [[User:Schiffy|Schiffy]] ([[User_talk:Schiffy|Speak to me]]|[[Special:Contributions/Schiffy|What I've done]]) 19:37, 7 April 2016 (UTC)

== #1663: Garden not yet added? ==

For me it's 4:30 AM, 4/4/16 - I have a sleep schedule just like [https://xkcd.com/361/], so I've been first on quite a few xkcd explanations immediately. when they came out.
I notice that usually, immediately once a new xkcd comic is released, a bot generates a corresponding bare-bones page on this wiki. However, this new comic "1663: Garden" doesn't yet have an automatically-generated page. Maybe it's because of the strange user-session hash key that appears in the URL bar when the "comic" is interacted with? Maybe this sort of interactive thing messes with the bot?
Am I just being impatient? Do I have to wait a few minutes? (I'm going to bed, and this probably won't be seen until tomorrow, but I am at least interested in knowing how the bot system works.) [[Special:Contributions/173.245.54.21|173.245.54.21]] 09:01, 4 April 2016 (UTC)

== Skins broken ==

It seems both the Classic and Monobook skins are very very broken. Only Vector seems to be laid out normally. [[User:Schiffy|Schiffy]] ([[User_talk:Schiffy|Speak to me]]|[[Special:Contributions/Schiffy|What I've done]]) 19:39, 7 April 2016 (UTC)
: Yes, for me too. Let me see what can be done. [[User:Jeff|Jeff]] ([[User talk:Jeff|talk]]) 20:10, 12 April 2016 (UTC)
::All calls to /load.php seem to fail, which results in the broken look. --[[Special:Contributions/162.158.86.167|162.158.86.167]] 11:02, 14 April 2016 (UTC)
:::Oh wow, I thought I was the only one. [[User:SuperSupermario24|Just some random derp]] 15:57, 8 May 2016 (UTC)
::::Should be fixed now. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 18:59, 17 May 2016 (UTC)

== #1682: Not sure about the reference for Russian meaning for Bun ==
''Also interesting to note is that in several Slavic languages (including Russian, Czech and Polish), the word for Rabbit literally means Little King''

I'm a native Russian speaker, and i've never heard of Rabbit being used for ''Little King''...

* Rabbit: ''krolik'' (кролик)
* Little King: ''korolyok'' (королёк)

Not sure if this above statement is correct for Russian language. {{unsigned ip|162.158.255.28}}
:This is the main page. You probably want to put this in [[Talk:1682: Bun]]'''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 16:36, 20 May 2016 (UTC)

== Random Button ==
The actual xkcd site has one and adding one would make it closer to the actual site and make discovering random comics and their explanations easier. It could go next to the comic # button.[[Special:Contributions/173.245.52.69|173.245.52.69]] 01:03, 5 June 2016 (UTC)
:There is a random page button on the left. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 02:36, 5 June 2016 (UTC)
::Oh. Didn't see that. Sorry.[[Special:Contributions/173.245.52.69|173.245.52.69]] 20:16, 5 June 2016 (UTC)

== XKCD Alignment Chart ==

A while back, I was searching for an XKCD alignment chart, with no success, so I made one. It is not perfect, so I'm wondering what other opinions on the alignment of the characters are.

Lawful Good- Beret

Neutral Good- Ponytail

Chaotic Good- Mrs. Roberts

Lawful Neutral-Cueball

Neutral Neutral- Megan

Chaotic Neutral- White hat

Lawful Evil- Hairy

Neutral Evil- Danish

Chaotic Evil- Black Hat

--[[User:Fallencrow305|Fallencrow305]] ([[User talk:Fallencrow305|talk]]) 22:10, 28 July 2016 (UTC)

:What about Help I'm trapped in a drivers license factory Elaine Roberts? --[[User:JayRulesXKCD|JayRulesXKCD]] ([[User talk:JayRulesXKCD|talk]]) 15:48, 29 September 2016 (UTC)
::Or Hairbun? Or Science Girl? Here are my predictions: Elaine - Chaotic Good, Hairbun - Lawful Good, Science Girl - Lawful Neutral --[[User:JayRulesXKCD|JayRulesXKCD]] ([[User talk:JayRulesXKCD|talk]]) 16:00, 29 September 2016 (UTC)

What? How can Beret Guy be anything other than chaotic?

== 1713 cc also means carbon copy. So 50 carbon copies of either of those words could be called for. ==

1713 cc also means carbon copy. So 50 carbon copies of either of those words could be called for. {{unsigned ip|108.162.215.146}}
:Sorry, but [[User:108.162.215.146|108.162.215.146]], you need to remember to sign your work. --[[User:JayRulesXKCD|JayRulesXKCD]] ([[User talk:JayRulesXKCD|talk]]) 11:50, 26 September 2016 (UTC)

== Chatroom Idea... What do you guys think? ==
I have an idea. What if there was a discussion board for the wiki? (And no, I don't mean boards like this or the "comment section" of comic explanations. I mean a live chatroom plugin of sorts. We could add it to the website and enable it so we can talk to each other in real-time and make live edits with each other. This way, we can also let each other know of edits we've made, make new pages altogether, or just talk. What do you guys think? -- [[User:JayRulesXKCD|JayRulesXKCD]] ([[User talk:JayRulesXKCD|talk]]) 9:10, 13 September 2016
:The [http://www.explainxkcd.com/wiki/index.php/Special:RecentChanges recent changes] log already notifies all users on the site of new pages and edits. User talk pages and the community portals exist for coordination. Also, avoid creating new comment topics in the middle of a talk page in the future, comments are supposed to follow a chronological order. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 15:39, 13 September 2016 (UTC)
::Sorry. --[[User:JayRulesXKCD|JayRulesXKCD]] ([[User talk:JayRulesXKCD|talk]]) 13:59, 26 September 2016 (UTC)

== Copying versus embedding ==

Hi, I'm new here and I'm trying not to be an asshole. However, I just noticed that this site uses its own archive of copied xkcd comics, rather than using the image URL provided for hotlinking and embedding. I can understand this website will want to have its own archive in case xkcd.org ever goes offline, but until then, why not just embed the images instead of copying?

The reason I'm asking: I just realised I hardly ever go to xkcd.org anymore ever since my browser put explainxkcd above xkcd.org. Explanations get updated, so sometimes I check back later, which rarely happens with the comics. It makes perfect sense. But if more people experience this issue, xkcd.org is getting fewer unique visitors because of it, and this could be fixed by fetching the image directly from there, while still making and storing a copy in case it is needed in the future. Thoughts, anyone? [[Special:Contributions/141.101.104.33|141.101.104.33]] 17:08, 18 October 2016 (UTC)
:So, we can't do this for every comic, like [[1190]] or other april fools comics. Also, xkcd's revenue comes from merchandise sales, not ad revenue, so I believe it's not actually negatively impacting them that we're serving the images ourselves rather than making the main site serve them for us. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 05:39, 19 October 2016 (UTC)

:Embedding images is generally known as "stealing bandwidth", since it uses resources of the original site's server (may be limited) without bringing it any actual visitors (they won't see anything else of the website, like announcements, shop, other sections, ...). Also, depending on how unique visitors are counted, "visitors" through embedding might be invisible (client's side scripts won't be loaded). So no image embedding without the original site's owner express permission. [[Special:Contributions/141.101.88.106|141.101.88.106]] 12:51, 7 February 2017 (UTC)

== Other Languages ==
Are there translations of pages anywhere. It has been mentioned that they are on subdomains of this site, or a sub-page, as Main_Page/es for spanish. I can't seem to find them there. [[User:The Muffin Man|The Muffin Man]] ([[User talk:The Muffin Man|talk]]) 14:48, 7 February 2017 (UTC)
:It's a work in progress, long delayed but I really do want to get to it eventually. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 18:58, 7 February 2017 (UTC)

== Why are there male/female symbols in some of the entries? ==

Those symbols are not in the comic, but they're in the table. I think a vandal put them there. Can someone remove them from the Lavaball, Bladeball, Eggspotting, Merfishing, Consequence Golf and Heck Escape? (now don't act like someone who criticizes "politically correct leftist "libt++d" SJW snowflakes" just because I said "heck" or censored the derogatory term for "liberal" or not even trying to say these uncensored) -- [[Special:Contributions/108.162.221.106|108.162.221.106]] 12:36, 25 November 2017 (UTC)

== How quaint ==

From the Main Page:

Explain xkcd: '''It's 'cause you're dumb.'''

From the Rules section:

'''Don't be a jerk. '''

(Emphasis mine)

How very ,very quaint. --[[Special:Contributions/162.158.126.100|162.158.126.100]] 21:00, 5 December 2017 (UTC)

== HTTPS? ==

Hi,
With the general trend towards HTTPS being favoured over HTTP for security and speed reasons, would it be possible to force the use of HTTPS and secure the mixed content please?

Please see [https://www.whynopadlock.com/results/7e707bfd-cd71-4b00-b95e-be226fb10fb6 Why no Padlock?] for more details.

Thanks,
[[Special:Contributions/162.158.179.202|162.158.179.202]] 10:32, 13 January 2018 (UTC)

:Browsing using HTTPS seems to just work. There's even a signed certificate.
:https://www.explainxkcd.com/wiki/index.php/1946

:I really don't get why people are so convinced that browsing using HTTPS is so much more "secure". You even seem to claim that it's faster?
:If you love it so much, install a browser extension like https://www.eff.org/https-everywhere.

:With the exception of the login / register page, I really don't see the point for enforcing this for the whole site. I am no admin though.
[[Special:Contributions/172.69.54.93|172.69.54.93]] 22:30, 25 January 2018 (UTC)

We are already in 2018 and this website still does not even redirect automatically to HTTPS ([https://support.cloudflare.com/hc/en-us/articles/200170536-How-do-I-redirect-all-visitors-to-HTTPS-SSL- you can do it so easily with Cloudflare...]) nor enforce HTTPS with {{w|HSTS}}... I don't know, just check [https://scotthelme.co.uk/hardening-your-http-response-headers/#strict-transport-security on Scott Helme's site] why it's important. Having to rely on the user installing an extension for doing the sysadmin work is a bad joke, really. And it does not fix some issues with mixed content of course. With Let's Encrypt and Cloudflare providing certificates for free and the plethora of tutorials online on securing a website (not limited to HTTPS), there is no excuse to not do it. -- [[User:guest|guest]] ([[User talk:guest|talk]]) 11:22, 31 January 2018 (UTC)

== "It's 'cause you're dumb" ==
I see that there was some talk about this a while ago, in which people seemed to agree that the "It's 'cause you're dumb" tagline is unnecessarily mean and should be changed... and yet, it's still here. I'd like to add some more fuel to the fire with several reasons why I really hate this tagline:

* The tagline doesn't fit the tone of XKCD. Randall celebrates knowledge. Even Black Hat wouldn't just outright say "You're dumb", because he's a classhole who can insult way better than that.
* Many of the people who contribute to this wiki are very smart. They're not dumb.
* They're also quite amicable from what I've seen. If they wouldn't insult someone, why is the website doing so?
* Not knowing something is not the same as being dumb. Even the smartest people don't know everything.
* Having a desire to learn is smart, not dumb.
* The tagline's logic is flawed. Just because you learn a new thing, doesn't mean you were dumb to begin with.

Anyone with me on this?

[[User:Hawthorn|Hawthorn]] ([[User talk:Hawthorn|talk]]) 14:07, 20 February 2018 (UTC)

: The first line of the "Rules" section is "Don't be a jerk" at the time of writing. The first thing this wobsite does is to break that rule. I'm not sure what else is to be said here. --[[Special:Contributions/162.158.126.76|162.158.126.76]] 16:55, 20 March 2018 (UTC)

:I always thought that was weird too. But it's still there... I'll tell the admins about it, and hopefully it will be changed. [[User:Herobrine|Herobrine]] ([[User talk:Herobrine|talk]]) 13:18, 18 April 2018 (UTC)

Explanation: ''This'' is a joke... Missing the punchline? --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 15:15, 18 April 2018 (UTC)

Personally, I'm fine with the current tagline. I consider it a joke and don't feel offended. However, if there is consensus a) that and b) to what it should be changed, I'm ok with changing it. --[[User:SlashMe|SlashMe]] ([[User talk:SlashMe|talk]]) 16:18, 18 April 2018 (UTC)

I'm wondering, would it be possible to temporarily (a week or so?) stop new ads from appearing in the sidebar and replace it with a poll concerning this issue? Right now it's just showing what appeared in the banners in [[1965: Background Apps]], and not a real ad. [[Special:Contributions/162.158.58.81|162.158.58.81]] 10:12, 19 April 2018 (UTC)
:The advertisement is used to pay the fees needed to run this site. Right now this wiki get's an upgrade but when it's done this discussion will get a proper placement here. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 13:37, 21 April 2018 (UTC)

The first time I encountered this tagline I thought it was pretty funny. Satire can be hard to detect online but this one seems clear enough. --[[User:DKMell|DKMell]] ([[User talk:DKMell|talk]]) 20:42, 20 August 2018 (UTC)
:What is it satirizing? I'm serious; I genuinely don't know. It could well be that I just don't get the joke. [[User:Hawthorn|Hawthorn]] ([[User talk:Hawthorn|talk]]) 13:39, 10 January 2019 (UTC)

At first I liked the joke, but now it's either annoying or I ignore it. Personally I don't feel it needs to be changed, as it's in the satirical spirit of xkcd, but I wouldn't care too much. [[User:Nyx goddess|Nyx goddess]] ([[User talk:Nyx goddess|talk]]) 22:56, 5 December 2018 (UTC)

It's satire, if it gets removed that's exactly the kind of overzealous political correctness that MAGA chuds are talking about when they accuse us of being snowflakes, howabout let's not give them ammo. - 02:03, 22 December 2018 (UTC) {{unsigned ip|162.158.63.94}}
:As above: what it is satirizing? Also, for my part, it's not about political correctness at all; it's that the tagline doesn't match my personal positive image of XKCD, nor of this wiki, and it just feels unfitting to me, for all the reasons that I laid out. [[User:Hawthorn|Hawthorn]] ([[User talk:Hawthorn|talk]]) 13:39, 10 January 2019 (UTC)

I'm in favor of a change. Let's drop the "dumb". Or at least modify it. I propose a "strikethrough" of dumb, then add any one of a list of possible words: confused, ignorant, curious, wondering, befuddled... (Oooh, could it randomly change each time the page is loaded? Code wizards, advance!) [[User:Imperpay|Imperpay]] ([[User talk:Imperpay|talk]]) 22:25, 24 January 2019 (UTC)
:A complete list of all synonyms of dumb, including dumb and all synonyms of those synonyms, according to thesaurus.com. One randomly loads each time you load the page via rng, or on a once a day system, like the incomplete page of the day. That would actually probably make it more mean on average, but more clearly a joke. Wouldn’t be impossible to code either.[[User:Netherin5|Netherin5]] ([[User talk:Netherin5|talk]]) 15:18, 21 February 2019 (UTC)

The reason I come to Explain XKCD is because I'm excited to see what other people have said about it. I agree with the above - it doesn't fit the spirit of xkcd's joy for knowledge and it really just isn't why people come here. Furthermore, it skirts demeaning people with disabilities. Please remove it. [[User:Jachra|Jachra]] ([[User talk:Jachra|talk]]) 07:43, 2 July 2019 (UTC)

I also agree with Hawthorn. This tagline always was very strange for me. No, this is nothing about political correctness. I don't mind being insulted, if there is a joke, or something ironical or satirical behind it. But there just isn't. It's just not funny at all.
A random selection on every page load from a long list of completely absurd reasons would be more the XKCDs way. You could even try to create one or more "''It's because ...''" explanations for every comic and randomly display one out of those. 2206: "''... you don't know how to type capital numbers.''", 2205: "''... you don't assume Pi is one.''", 2204: "''... you didn't give us a moon.''", 2203: "''... there wasn't a really big meteor impact for a while.''" and so on. Pretty straight forward. The more frequent visitors of XKCD would probably even get many of the references and remember the corresponding comic. --[[Special:Contributions/162.158.91.221|162.158.91.221]] 17:39, 24 September 2019 (UTC)
:I did recently raise the issue again on the [https://www.explainxkcd.com/wiki/index.php/explain_xkcd:Community_portal/Miscellaneous#Is_the_.22It.27s_.27cause_you.27re_dumb.22_tagline_a_relic_of_the_past.3F Community Portal], explaining my case in more detail, although it seems to have garnered little interest. [[User:Hawthorn|Hawthorn]] ([[User talk:Hawthorn|talk]]) 12:13, 30 September 2019 (UTC)

What instead, then? It's poor form to suggest half a change; if not "it's cause you're dumb," what should the tagline be? [[Special:Contributions/173.245.52.85|173.245.52.85]] 16:37, 25 December 2019 (UTC)

There seems a pretty clear consensus to get rid of the jarring insult, with no apparent objections. Has been for years now. What do we need to do to delete it? What's the blocker, here?
"first we need a consensus on replacement" isn't an answer. It sets too high a bar for something which is trivial, and anyway replacement is a separate task which can be performed later. Deletion is step 1, so what needs to be done to perform step 1, since none of us seems to have access to do so?
Personally, I'd argue for making it publicly editable, which then magically also resolves step 2, replacement. Any tagline that stayed for any amount of time would then only remain because it was widely considered worthy by site members. --[[Special:Contributions/172.69.71.143|172.69.71.143]] 16:39, 30 September 2021 (UTC)
:I like that idea, it efficiently gets rid of the years-old issue, and any further issues would have their own discussion page, plus any change that's problematic, obscene or spam could easily be reversed. I can imagine that at first there would be many changes, but after a few weeks/ months it should stabilize itself. [[User:256.256.256.256|256.256.256.256]] ([[User talk:256.256.256.256|talk]]) 14:19, 30 November 2021 (UTC)

In my opinion it is not an issue of political correctness, or any related flavour of woke nonsense. It is much simpler. Problem is, ''"It's 'cause you're dumb"'' is extremely pretentious and high-horsed, while simultaneously having absolutely no business being so. It feels like it is said by someone who unironically refers to him/herself in third person. Someone whose professional CV includes the fact that he/she used to be a class leader in second grade of primary school. Someone who used to remind a teacher about homework that the teacher was supposed to check, but forgot. Someone who still asks his/her mom to cut the crust off his/her sandwiches. I am not offended nor insulted by this line, I am just cringing because of that line's author being too socially inept to realize that he/she is not in the place to judge and attempt insulting readers' intellectual capabilities. Understanding Munroe's poorly drawn stick figures, diatribes, and diagrams originating from his neurotic turmoil does not come with an added bonus of entering the supposed high echelons of intelligence, and certainly not comedy nor humour. Munroe's "humour" actually requires only the superficial sliver of knowledge from any given domain to understand and thus does not really come with too many prerequisites, while at the same time it succeeds in making readers feel rare and exceptional as a result of being able to understand said "humour", and makes them feel much smarter than they actually are. That's why those comics were able to find quite a large audience within their niche. It is quite smart in itself, actually: while Munroe may be poor quality comedian, he seems to be self-aware enough to realize the existence of his own shortcomings, and compensate by "bribing" his readers via appeasing their egos. In return, the readers are willing to overlook poor comedic value of virtually all Munroe's content, as long as they are being deluded to feel exceptionally intelligent and sophisticated for understanding the comics' supposedly hyperintellectual subtle references. Meanwhile, doing what this website does: insulting that audience is basically, in principle, going in the completely opposite direction to what actually made Munroe's content successful in the first place, and hence is quite self-destructive from this website's point of view. --[[Special:Contributions/172.70.242.207|172.70.242.207]] 00:20, 3 May 2022 (UTC)

== Editor FAQ ==
Eventually we may need that banner at the top for something else, like the incomplete explanation spotlight, or when the wiki was being upgraded, so I think we should add the Editor FAQ in the New Here? section. [[User:Herobrine|Herobrine]] ([[User talk:Herobrine|talk]]) 11:21, 2 June 2018 (UTC)
:It's a first draft and I'm just waiting to be convinced that it's NOT incomplete. And be sure I haven't written it without a plan how to present it on the proper places. Furthermore this "Sitenotice" on the top is only "dissmissable" for valid users, every visitor not logged in does see this always. Thanks for your participation and I'm grateful about any help. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 16:30, 2 June 2018 (UTC)

== Categories on Main Page ==

[[MediaWiki:Common.css]] has the following entry:
<pre>
.page-Main_Page div#catlinks ul li {
border-left: none;
position: absolute;
left: 70px;
bottom: 6px;
}
</pre>
The <code>70px</code> cause an overlap for me in Firefox, and much too small a gap in Chrome. I suggest to actually remove that line completely, just compare it with categories on other pages: The gap is quite large. In Firefox, also the <code>6px</code> are too much, but in Chrome they are required. But it might be worth to try whether setting vertical align to something else can achieve a more consistent display. --[[Special:Contributions/162.158.88.230|162.158.88.230]] 10:22, 13 July 2018 (UTC)
:And the comment above that says: "Dirty hack to hide the categories of the current comic from main page. ...". I'm aware of this but there is much more, especially for a mobile version I'm looking forward to. Only in this case I see three problems: The component is rendered as a list (ul,li) by hiding the bullets. This then empty space is always rendered different in different browsers. Using "position: absolute" tries to circumvent this but absolute positioning is bad layout and never should be used. Furthermore mixing the units ''px'' and ''em'' in many places is also a problem when comparing it at different browsers. I'm working on this with the final goal also having a proper mobile version, not only for Firefox, Chrome, Edge,... on a desktop. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 12:12, 13 July 2018 (UTC)

== Bookmark ==

I think we should add this book mark I made to automatically transfer anything from xkcd to its explainxkcd page (I was frustrated, ok?):

javascript:x=window.location.href;x = x.replace(/\D/g,'');t=document.title.substring(5).replace(/ /g,"_");window.location.href="https://www.explainxkcd.com/wiki/index.php/"+x+":"+t;

I know the code could be more compact, but using this, you can just press a button and it will take you to the explain page {{unsigned ip|172.68.47.84}}
:Just changing the URL from <code>xkcd.com/2115/</code> to <code>explainxkcd.com/2115/</code> (putting the word explain to the beginning) does the same. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 16:41, 22 February 2019 (UTC)
:Collecting these [[Browser helpers|here]]. – [[User:Yfmcpxpj|Yfmcpxpj]] ([[User talk:Yfmcpxpj|talk]]) 04:48, 13 October 2020 (UTC)

== Non-comic explanations? ==

So I was looking at xkcd and I noticed a little jokey line near the bottom of the page in very small print that reads <pre> <nowiki> "xkcd.com is best viewed with Netscape Navigator 4.0 or below on a Pentium 3±1 emulated in Javascript on an Apple IIGS at a screen resolution of 1024x1. Please enable your ad blockers, disable high-heat drying, and remove your device from Airplane Mode and set it to Boat Mode. For security reasons, please leave caps lock on while browsing." </nowiki> </pre>
Now, I know enough to understand the joke, but it would be nice to have a page for this. Do we have one? Am I just blind? Either way, I would like to know. Thanks! [[User:Nyx goddess|Nyx goddess]] ([[User talk:Nyx goddess|talk]]) 23:39, 28 March 2019 (UTC)
:Nevermind, I just found it. Sorry! [[User:Nyx goddess|Nyx goddess]] ([[User talk:Nyx goddess|talk]]) 23:40, 28 March 2019 (UTC)

== Latest comic released. ==

I don't know where to post this, but the bots haven't created the page yet.
[[User:HelloWorld|HelloWorld]] ([[User talk:HelloWorld|talk]]) 19:24, 4 April 2020 (UTC)

: Probably infected by COVID-19. That's why you should wash your keyboards after visiting other websites. Until then, feel free to create the page manually (if possible). --[[Special:Contributions/108.162.242.19|108.162.242.19]] 21:07, 4 April 2020 (UTC)

== Minor edit proposal ==

Line 19 of the main page includes this sentence:
<pre>Many of the recent contributors, listed above, have [http://www.explainxkcd.com/wiki/index.php?title=Special%3AContributions&contribs=newbie just joined].</pre>
That right there is not a wikilink. Could we change it to:
<pre>Many of the recent contributors, listed above, have [{{fullurl:Special:Contributions|contribs=newbie}} just joined].</pre>
Both render as follows:
{|class="wikitable"
|Many of the recent contributors, listed above, have [{{fullurl:Special:Contributions|contribs=newbie}} just joined].
|}
And I think my way is cleaner. [[User:Jacky720|That's right, Jacky720 just signed this]] ([[User talk:Jacky720|talk]] | [[Special:Contributions/Jacky720|contribs]]) 14:52, 9 April 2020 (UTC)

==1000: 1000 Comics/1000 characters update==
I've completed the blank explanations for all the remaining characters in [[1000: 1000 Comics/1000 characters]]; however, it could really use some work in terms of verification. I offer the sweet incentive of being able to get rid of a page's 'incomplete' label as reward for people to double check my, and [[User:Kynde|Kynde's]] work on the project. [[User:BlackHat|Your favourite sociopath]] ([[User talk:BlackHat|(the one who leaves all the parentheses open]] 07:58, 25 October 2020 (UTC

==2021-02 updates to top of page==
I don't really like the changed first few lines - I think it takes up too much room and the previous info was better. I look at the main page daily, and want to see the comic and explination not all this stuff that I think would be better down below the daily comic display. [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 17:50, 5 February 2021 (UTC)

: I agree, and it drives me crazy that {{tl|Welcome}} is designed for talk pages, so there is a red link to [[User:Main Page]]! [[Special:Contributions/172.68.142.213|172.68.142.213]] 15:22, 6 February 2021 (UTC)

: Since Jeff is much more involved in all this sort of stuff than myself, I would tend to defer to his judgement, but I also agree that the "Main Page" red link is pretty ugly. I will "be bold" and revert the change and then drop it if he really wants it. [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 18:54, 6 February 2021 (UTC)
::I guess I cannot revert things as there are no "edit" buttons I can view for the Main Page [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 19:01, 6 February 2021 (UTC)
:::You need administrator privileges to edit the main page. This was done to reduce spam, which is basically non-existent now. I made the {{tl|Welcome}} template, and I certainly did not make it for it to be displayed in the main page! I made it to welcome new users to the site. — [[User:Sqrt-1|The 𝗦𝗾𝗿𝘁-𝟭]] [[User talk:Sqrt-1|talk]] [[Special:Contributions/Sqrt-1|stalk]] 13:16, 8 February 2021 (UTC)
::::I see on [User:Jeff|Jeff]]'s talk page that Sqrt-1 has made a comment about this so maybe it will be taken care of. I am guessing that some automatic bot-like thing might have made an error. Today I got the {{tl|Welcome}} template added to my user page by Sqrt-1. It does seem like a useful template for user pages - less so for the Main page. [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 13:28, 8 February 2021 (UTC)
:It looks like [[User:Jeff|Jeff]] has reverted it - Thanks! [[User:J-beda|J-beda]] ([[User talk:J-beda|talk]]) 11:51, 12 February 2021 (UTC)

== Overuse/misuse of incomplete template ==

Instead of having information on why the comic is incomplete or being removed once the explanation is finished, the incomplete template is being treated as a place to put witty comments. This overcrowds the category, making it more difficult to see articles in need of actual help or know why they need help. I have gone through the incomplete articles and posted new topics on ones with incomplete tags that do not provide information on why the template is there, asking to know why the comic is incomplete and, failing that, to have the template removed. For the full details, please see [[User:Quillathe_Siannodel|my user page]].

I would like to request that either a less obtrusive solution or compromise be found or the error of my (relatively new user) ways be explained to me by someone more experienced.

Sincerely, <s>[[406:_Venting|Summer Glau]]</s> [[User talk:Quillathe Siannodel|{)|(}]][[User:Quillathe_Siannodel|Quill]][[User talk:Quillathe Siannodel|{)|(}]]

P.S. Maybe an "incomplete incomplete template" template? I don't know.

P.P.S. I can kill you with my brain.

I don't know. I re-signed and edited so many times, March 2021 (UTC)
: In some cases, the "incomplete" tag is left on for a long time, when nobody takes the trouble to remove it from a page that has migrated out of people's attention. Sometimes, people remove it inappropriately, while a page is still actively under revision. In many cases, it's hard for anyone to say what's "incomplete" about a page because there's relevant stuff to add that isn't obvious until someone adds it. The question is more: at what point can a page be reasonably assumed to be "complete"? A week after the most recent edit to it? Some pages undergo revision for quite a while after they're first posted; other pages remain stable after only a few days. It annoys me when someone edits a page and removes its "incomplete" tag at the same time, which gives me the impression of "now that I have made my change, the page is in its final form, and nobody else should touch it!" [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 22:55, 6 April 2021 (UTC)
::Proposal: The default text of the incomplete template could be modified to include <code><nowiki>[[Category: Incomplete Incomplete (or something similar)]]</nowiki></code>. If the text is modified, the page should be removed from the category. This new category would be easily accessible from the main page, and anyone visiting it should see information about the category's meaning and how to help make said templates more informative. Possible ways to go about this:
::* Line 315 of the bot script would be changed to read: <code><nowiki>{{incomplete|Created by a BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.[[Category: Whatever The Name Ends Up Being]]}}</nowiki></code>.
::* The main page banner would be changed to read: <code><nowiki>''Welcome to the '''explain [[xkcd]]''' wiki!'' 
We have an explanation for all [[:Category:All comics|'''{{#expr:{{PAGESINCAT:All comics|R}}-1}}''' xkcd comics]],

and only {{PAGESINCAT:Incomplete explanations|R}}
({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 0}}%) [[:Category:Incomplete explanations|are incomplete]]. Help us finish them! If you're looking for something easier, you could also edit one of the {{PAGESINCAT:Whatever The Name Ends Up Being|R}} pages with [[:Category:Whatever The Name Ends Up Being|incomplete explanations]], which would help other editors.</nowiki></code>.

::* The new category would read: <code><nowiki>This is the category page for incomplete pages that have no explanation for why they are incomplete in the incomplete tag. Do not add pages to this category. See also: [[:Category:Incomplete pages]] and [[:Category:Incomplete transcripts]]</nowiki></code>.
::I will not do this without first seeking community approval, because these are huge edits that could majorly change the wiki. Is this a good idea? [[User talk:Quillathe Siannodel|{)|(}]][[User:Quillathe_Siannodel|Quill]][[Special:Contributions/Quillathe_Siannodel|{)|(}]]
::: Feels a great idea. Given the dearth of opinion ventured either way, and given you've given plenty of time for people to declare an opinion, I'd argue to be bold, do it, and see if people squeal. It can always be reverted if required. --[[Special:Contributions/172.70.178.161|172.70.178.161]] 17:02, 9 November 2021 (UTC)

== Add another digit to percentage incomplete count ==

With the large majority of comics gaining explanations, I suggest that the current expression be adjusted to the following, changing "round 0" to "round 1":

<pre>({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 1}}%)</pre>

Resulting in: ({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 1}}%)
[[User:Gamma|Gamma]] ([[User talk:Gamma|talk]])

== Problems creating account ==

I just attempted to create an account, and got the following message:
There are problems with some of your input.

I made an adjustment to the password (which seemed to be the problem), consisting of making one of the letters of my original attempt a capital. This didn't work.

There is no point telling me there are problems with my input and not telling me what the problems are. I can't read your mind at this distance.

Cheers
Copey.

== 2530: Clinical Trials ==

Maybe step 3 should come before step 2?

== add non-numbered comics ==

idea: for the "We have an explanation for all [number] xkcd comics..." make the number include the non-numbered comics like five minute comics part 4, Syndication, Blue Eyes, and that one book-publishing-rate one. what do you guys think? [[Special:Contributions/108.162.221.93|108.162.221.93]] 17:52, 22 October 2021 (UTC)Bumpf

:Good point, also as of right now even only including the numbered comics it's not up-to-date, as the newest comic is 2555 and it says "We have an explanation for all 2554 xkcd comics" -- [[User:256 256.256.256|256.256.256.256]] ([[User talk:256 256.256.256|talk]]) 09:38, 16 December 2021 (UTC)

:: That is likely due to:
<nowiki></nowiki>
:: -- [[Special:Contributions/108.162.237.65|108.162.237.65]] 17:21, 21 February 2022 (UTC)

== fix these articles please! ==

[[What If chapters]] should be a redirect, not a mirror of [[What If? chapters]] ! [[Special:Contributions/172.69.71.10|172.69.71.10]] 17:38, 19 November 2021 (UTC)Bumpf
:Done. — [[User:Sqrt-1|The 𝗦𝗾𝗿𝘁-𝟭]] [[User talk:Sqrt-1|talk]] [[Special:Contributions/Sqrt-1|stalk]] 07:00, 28 November 2021 (UTC)

== lol ==

https://www.reddit.com/r/xkcd/comments/6xbc78/reading_xkcd_comics/ 13:14, 17 December 2021 (UTC)

== Top 10 includes no more than 9 people? ==

[[File:Top_10_but_it's_just_nine.png]]

have only nine users edited in the past seven days (unlikely) or does that top ten list really show no more than nine users? [[User:256.256.256.256|256.256.256.256]] ([[User talk:256.256.256.256|talk]]) 09:13, 6 January 2022 (UTC)
:My guess is that it is because currently place 10 and 11 have a tie with a score of 4 due to 3 edits on 2 pages and the top 10 table can show a maximum of 10 entries and cannot "decide" which one to show as no 10.
:You can view the full list by clicking the "lots of people" below the table. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 13:19, 6 January 2022 (UTC)

::That would make sense, except right now it alternates between ElijaRock and Asdf who both have two edits, two points and two unique pages edited, and pure chance seems to decide which one of the two gets 10th place every time I hit F5 [[User:256.256.256.256|256.256.256.256]] ([[User talk:256.256.256.256|talk]]) 14:31, 12 January 2022 (UTC)
:::PS: The actual 10th place right now is neither Asdf nor ElijaRock, it´s Jack (or at least it should be and sometimes, when the wind is blowing in the right direction, it even is) [[User:256.256.256.256|256.256.256.256]] ([[User talk:256.256.256.256|talk]]) 14:34, 12 January 2022 (UTC)

== Countdown Timer? ==

What’s the timer at the top right of the xkcd site counting down to? Apologies if there’s already a page on this; I didn’t look very hard :P

See https://www.explainxkcd.com/wiki/index.php/Talk:2566:_Decorative_Constants -- [[Special:Contributions/172.70.114.39|172.70.114.39]] 02:17, 11 January 2022 (UTC)

Now here: https://www.explainxkcd.com/wiki/index.php/Countdown_in_header_text.

== Set up X-Forwarded-For for correct IP address reporting ==

(I already posted this on David's talk, but I noticed he's no longer active... Hopefully an admin will read this here) This should be done server-side, as right now (and for a very long time) it's been reporting load balancer / cache IP addresses for all the users. With recent vandalism, it'd help. [[User:BytEfLUSh|BytEfLUSh]] ([[User talk:BytEfLUSh|talk]]) 22:27, 29 April 2022 (UTC)

== Vandalism ==

To think that the seventh user on the all time list is a vandal… [[User:While False|While False]] ([[User talk:While False|talk]]) 22:39, 3 May 2022 (UTC)

1035: Cadbury Eggs

2022-05-04T00:45:29Z

172.68.66.63: Undo revision 232658 (vandalism) by X. K. C. D. (talk)

{{comic
| number = 1035
| date = March 28, 2012
| title = Cadbury Eggs
| image = cadbury_eggs.png
| titletext = When they moved production from New Zealand to the UK and switched from the runny white centers to the thick, frosting-like filling, it got way harder to cook them scrambled.
}}

==Explanation==
{{w|Cadbury Creme Egg|Cadbury Eggs}} are a chocolate egg-shaped candy with a filling. They are supposed to replicate a real egg with a hard exterior and soft interior. However, unlike real eggs, the exterior is edible.{{Citation needed}}

In this comic, [[Cueball]] is trying to say that sodas have way too much sugar to even be appealing as beverages, because they contain as much sugar as 2 or 3 Cadbury Eggs, and one Cadbury Egg alone makes him feel gross. (A 12 oz can equals 355 mL, while a 20 oz bottle is about 590 mL.)

However, [[Megan]] interprets this in precisely the opposite way to what Cueball intended. Instead of comparing soda to Cadbury Eggs, she compares Cadbury Eggs to soda. If a [[1070|few]] Cadbury Eggs have the same amount of sugar as soda, Megan can eat as many as she wants year-round in place of soda, with no additional guilt. Cadbury Eggs are usually consumed around {{w|Easter}} — which is anywhere between March 22nd and May 7th, depending on whether one is consulting the Catholic or Orthodox calendar.

The title text mentions the closure of the {{w|Cadbury Creme Egg#Manufacture in New Zealand|manufacture in New Zealand}} in 2009 and the change of the filling from runny to thick as a consequence. The joke here is the comparison to real eggs, which can be cooked {{w|Scrambled_eggs|scrambled}}, the new thick filling is not liquid enough to be cooked in a pan, as was the old runny filling.

==Transcript==
:[Two Cadbury eggs, one in the foil, the other out of the foil and broken open to reveal the gooey center.]
:A Cadbury egg has about 20g of sugar. (25g outside the US.) "One Cadbury Egg" is a nice unit of sugar content.

:[A can of soda with an equals sign and two eggs; a bottle of soda with an equals sign and three eggs.]
:One 12oz. can of soda has about two Cadbury eggs worth of sugar. One 20oz. bottle has three.

:[Two unwrapped Cadbury eggs, with an arrow indicating they should be placed in a glass of water.]
:One Cadbury egg is enough to make me feel kinda gross. Now when I see Coke or Snapple or Nestea or whatever, I imagine drinking a couple of dissolved Cadbury eggs.

:[Megan puts her hand to her chin in thought, Cueball has his arms out in exclamation.]
:Megan: Wow. Huh. So the takeaway is... I can eat Cadbury eggs by the handful all season and feel no worse about it than I do about soda?
:Cueball: That's not really—
:Megan: This is ''awesome!''
:Cueball: *sigh*

==Trivia==
*Cadbury Eggs and the high sugar content of soda are referenced again in [[1793: Soda Sugar Comparisons]].
*The Cadbury egg/soda comparison is also mentioned in the what if? {{what if|74|Soda Planet}}.

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

1289: Simple Answers

2022-05-04T00:45:02Z

172.68.66.63: Undo revision 234522 (vandalism) by X. K. C. D. (talk)

{{comic
| number = 1289
| date = November 11, 2013
| title = Simple Answers
| image = simple answers.png
| titletext = 'Will [ ] allow us to better understand each other and thus make war undesirable?' is one that pops up whenever we invent a new communication medium.
}}

==Explanation==
This is [[Randall]]'s commentary on some of the baseless skepticism and equally baseless optimism directed at new technologies. Related: [[1215: Insight]] and [[1227: The Pace of Modern Life]]. While it's always healthy to evaluate the advantages and disadvantages of cutting-edge tech before blindly diving in and adopting it, it's not healthy to base that evaluation on unrealistically high standards and expectations.{{Citation needed}} New developments will have pros and cons, and it's hard to tell whether they make the world a better place or not.

Randall has set up a Q&A for this kind of questioning. Most of the them are straightforward, but we'll provide some commentary on selected questions.

''Will [ ] destroy whole industries? Yes.'' A widely adopted technology usually causes another to gradually phase out, and industries will rise and fall as technologies do. This is a bit of a loaded question because "destroy industries" sounds negative, and only covers half the effect — instead of merely destroying them, we're also {{w|Creative destruction|replacing}} them with something (hopefully) better.

''Will teens use [ ] for sex? Yes. Were they going to have sex anyway? Yes.'' Sex is pretty important to almost everyone, so it'll find its way into most generic technologies. Hormone-crazed tech-savvy teenagers are a particularly strong intersection of the two. Parents fearing teen sex might be worried about how their kids would use the technology, but the second question refutes these concerns quite concisely.

''Will [ ] destroy music/art? No.'' Every new technology for reproducing musical and artistic works (such as [https://www.eff.org/deeplinks/2004/03/wicked-player-piano player pianos] and [http://www.forbes.com/sites/joshbarro/2012/01/18/thirty-years-before-sopa-mpaa-feared-the-vcr/ video cassette recorders]) has been accompanied by warnings that it will destroy the industry that supplies it content. The reality is a special case of the "destroy industries" question - old business models will fall but new ones will arise in their place, and art and music as a whole will survive.

''But can't we go back to a time when— No.'' Elderly people {{tvtropes|WhenIWasYourAge|express their disapproval}} of today's technological luxuries, nostalgically longing for a time before Foo or Bar came around. That's just how the stereotype goes, but there is a large helping of truth to it. Usually, their sentiments are not a fair judgement, but an emotional attachment to the olden days and a {{tvtropes|TheyChangedItNowItSucks|resistance to change}}.

''Will [ ] bring about world peace?- No.'' People have been trying to bring about world peace for centuries; sadly, other people are in no such hurry and insist on more conflict to solve their own problems.

The final answer is a depressing and strangely beautiful comment on human nature: ''Will [ ] cause widespread alienation by creating a world of empty experiences? We were already alienated.'' Skeptics may be concerned that a new technology will make people's pleasures and interactions more artificial and shallow; Randall comments that this is already something well known in our society.

From the Title Text, ''Will [ ] allow us to better understand each other and thus make war undesirable?'' describes the usual theory that a technology might use to bring about world peace. Unfortunately, not only does the answer seem to be "no" to World Peace either way, but there's no indication that increased global communication actually facilitates understanding and empathy between distant communities. In fact, many cynics say the Internet has in fact caused the opposite effect, causing people to fracture into like-minded cliques rather than intermingle.

==Transcript==
:[Caption above the chart:]
:The '''simple answers''' to the questions that get asked about every new technology:
:{| class="wikitable"
|Will [ ] make us all geniuses?||align="center"|No
|-
|Will [ ] make us all morons?||align="center"|No
|-
|Will [ ] destroy whole industries?||align="center" |Yes
|-
|Will [ ] make us more empathetic?||align="center" |No
|-
|Will [ ] make us less caring?||align="center" |No
|-
|Will teens use [ ] for sex?||align="center" |Yes
|-
|Were they going to have sex anyway?||align="center" |Yes
|-
|Will [ ] destroy music?||align="center" |No
|-
|Will [ ] destroy art?||align="center" |No
|-
|But can't we go back to a time when-||align="center" |No
|-
|Will [ ] bring about world peace?||align="center" |No
|-
|Will [ ] cause widespread alienation by creating a world of empty experiences?||align="center" |We were already alienated
|}

==Trivia==
* Robinson Meyer of {{w|The Atlantic}} [https://www.theatlantic.com/technology/archive/2013/11/xkcd-is-amazing-but-its-latest-comic-is-wrong/281422/ rather disagreed] with [[Randall Munroe]] on this one...

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

1904: Research Risks

2022-05-04T00:44:34Z

172.68.66.63: Undo revision 234658 (vandalism) by X. K. C. D. (talk)

{{comic
| number = 1904
| date = October 18, 2017
| title = Research Risks
| image = research_risks.png
| titletext = The 1919 Great Boston Molasses Flood remained the deadliest confectionery containment accident until the Canadian Space Agency's 2031 orbital maple syrup delivery disaster.
}}

==Explanation==
This is a comparison of the possibility of the subjects of various sciences being a threat to humanity. It can either be an autonomous threat to the local population (i.e. by escape from a lab), or as part of a supervillain's scheme to [https://www.youtube.com/watch?v=GBkT19uH2RQ rule the world].

In general, areas of study that could be used by supervillains, but are unlikely to "break free" refer to technologies that are unlikely to be self-propagating or self-maintaining, but could be used as weapons or for some other form of control. Subjects that could break free, but are unlikely to be used by supervillains are all living organisms (which could presumably breed and multiply without human intervention), but which have little potential as weapons. Areas of study that fall in both categories are either more controllable forms of biology (microbiology, genetic engineering), forms of technology that could become self-propagating (robotics), or a study where a release could be dangerous without being self-propagating (chemistry).

The category of a low risk of either could, of course, contain many fields of study, as most research fields have limited potential for weaponry and little danger of going out of control on a large scale.

See the chart below for detailed explanations of each scatter point.

There have so far been several similar comics with such [[:Category:Scatter plots|scatter plots]]. See for instance [[1242: Scary Names]], [[1468: Worrying]], [[1501: Mysteries]] and [[1701: Speed and Danger]].

The title text is related to the Molasses Storage entry at the bottom left of the chart, and references the {{w|Great Molasses Flood}}, also known as the Great Boston Molasses Flood. It occurred on January 15, 1919 in the North End neighborhood of {{w|Boston}}, {{w|Massachusetts}} (the state in which [[Randall]] lives). A large {{w|molasses}} storage tank burst and a wave of molasses rushed through the streets at an estimated 35 mph (56 km/h), killing 21 and injuring 150. The joke in the title text is that in 2031 (14 years after the release of this comic) the {{w|Canadian Space Agency}} has an even more serious disaster, which will be known as the orbital {{w|maple syrup}} delivery disaster. The title text claims that this disaster then became the deadliest {{w|confectionery}} containment accident, thus killing more than 21 people.

==Table==
{| class="wikitable sortable"
! Risk of Breaking Free !! Risk of Supervillain !! Research field !! Research Risks !! Comments
|-
| 6% || 90% || Prosthetics || Cyborgs || A large number of villains in media have had augmentative and non-augmentative prosthetics for various reasons. However, there's very little risk of individual prosthetic limbs getting loose and terrorizing people.
|-
| 21% || 83% || Neuroscience || Mind Control || Neuroscience is the study of the human brain. While the greatest risk in this field is the danger that mad scientists will adapt its findings for nefarious purposes, {{w|Fiend Without a Face|horror movies}} will attest that there is always a chance that brains will break out of their labs and perpetrate violence of their own accord.
|-
| 2% || 76% || Laser Optics || Something like {{w|Laser Weapon System}}. Or a powerful laser could be used to [https://www.youtube.com/watch?v=DoQwKe0lggw cut a hero in two] as in {{w|Goldfinger}}. || See {{w|Directed-energy weapon}}. Lasers, like prosthetics, are unlikely to do much damage without people to wield them, though.
|-
| 36% || 77% || Pharmacology || Poisons || Pharmacology studies the effects of medicines and drugs. There are scores of instances where supervillains attempt to use some sort of drug to incapacitate the hero or the general populace. It's possible that a laboratory accident may also result in a new or altered creature which can proceed to go on a rampage.
|-
| 19% || 69% || Materials Science || Villains: New materials used for villainous purposes. Escape: new materials turning out to be alive and also evil || Adamantium, Vibranium, Kryptonite, etc. Alternatively, {{w|Life (2017 film)|soil samples may contain predatory life form}}.
|-
| 24% || 62% || Sociology || Tyranny, manipulation. || Sociology studies the development and interactive patterns of human societies. While it's unlikely ({{w|American Revolution|though}} {{w|French Revolution|hardly}} {{w|Greek War of Independence|impossible}}) that societies will "escape" and wreak havoc and destruction, this field is very useful to the supervillain that seeks to ingratiate him/herself with people, or otherwise establish their power via Machiavellian means.
|-
| 5% || 57% || History || Supplemental research, {{w|historical negationism}} || History mostly consists of artifacts, data and records, which are unlikely to break free.{{citation needed}} A particular ''subject'' of history, however, can be of use to a supervillain--for example, one might adapt the methods of previous successful dictators and [https://www.youtube.com/watch?v=n9aYrURLHh0 learn from the errors of unsuccessful dictators] to fulfill one's goals. Alternatively, after achieving dictatorial rule, a villain might {{w|Ministries of Nineteen Eighty-Four#Ministry of Truth|alter history in order to consolidate their power}}.
|-
| 36% || 53% || Psychology || Manipulation, Hannibal Lecter || Psychology studies human mentality. It contains the topic of "[http://on-memetics.blogspot.com/2013/10/memetic-hazard.html memetic hazards]" (information bytes that do some sort of harm to the viewer--e.g., propaganda) which could "break out" into the local population. The same supervillainous possibilities as sociology apply.
|-
| 73% || 95% || Robotics || Villains: Robot minions. Escape: evil robots, nanobots || Robots are minions of villains in many occasions, and research on it could be used to further power them up. Apart from supervillains, popular tropes include robots gaining sentience and killing everything, or nanobots going rogue and [[865: Nanobots|devouring]] everything in their path.
|-
| 92% || 90% || Genetic Engineering || Villains: Modified, super powered minions. Escape: Modified life forms || See {{w|Gene drive}}. Genetic engineering is generally the source of modern monster movie creatures, and the dangers of GMO food are often debated. Meanwhile, it's become common practice for villains to have an army of genetically altered superhumans at their disposal, or an array of useful monsters created via genetic engineering.
|-
| 61% || 77% || Chemistry || Explosives, corrosives, mutagens || Villains could obviously use certain chemicals, like nitroglycerin or chlorine trifluoride, to explode things and wreak general havoc. They could also use unspecified chemicals to modify creatures into monsters to do their bidding, or such monsters could be accidentally produced in a lab, escaping to threaten the locals.
|-
| 97% || 81% || Microbiology || Lethal diseases || See for instance {{w|12 Monkeys}}. Whether the microbes escape on their own (which Randall implies is all-but-inevitable) or are employed by a supervillain, the outcome is similarly horrifying.
|-
| 5% || 41% || Geology || Earthquake machines || Geology is the study of rocks. Scores below average on the supervillain scale, since aside from the odd supervillain attempting to [https://ask.metafilter.com/28644/Lex-Luther-vs-the-San-Andreas-faultline cause earthquakes], geology is not highly useful to evildoers. It's also very unlikely that rocks will escape and terrorize the world, since they don't tend to move very much.
|-
| 9% || 31% || Linguistics || {{w|Newspeak|1984 Newspeak}} || Aside from the possibility that people in general or supervillains in particular will create deliberately misleading/manipulative language to achieve their purposes, linguistics doesn't pose too much of a threat.
|-
| 16% || 22% || Paleontology || Reviving dinosaurs and other such prehistoric creatures. || Study of fossils. Reviving dinosaurs {{w|Jurassic Park|isn't exactly good for human survival}}. Aside from this possibility, though, [[1211: Birds and Dinosaurs|the majority]] of dinosaurs aren't terribly dangerous, being very dead.
|-
| 6% || 12% || Astronomy || Asteroid impact || A villain could divert an asteroid towards Earth. Randall also rates them as unlikely to "break free"; this is likely because asteroids are already "free" in space, because the risk of them "threatening the local population" is very real.
|-
| 33% || 12% || Molasses Storage || Flood || Breaking free chance is medium low as molasses did "escape" at least once in history. See {{w|Great Molasses Flood}}, as referenced in the title text.
|-
| 7% || 4% || Dentistry || {{w|Jaws (James Bond)}} || Teeth are neither likely to escape on their own, nor terribly useful to villains.
|-
| 70% || 43% || Botany || Man-eating plants || Plants are [http://littleshop.wikia.com/wiki/Audrey_II commonly used] in [http://triffids.guidesite.co.uk/triffids horror films] where they mutate and eat everything.
|-
| 93% || 41% || Entomology || Disease, famine, flesh-eating bugs || Entomology is the study of insects. Insects are small and can often escape through even small cracks, and are known for carrying diseases. They could also mutate into terrifying threats - see for example the movie ''{{w|Empire of the Ants (film)|Empire of the Ants}}''. Entomology is also referenced in [[1012: Wrong Superhero]].
|-
| 60% || 33% || Mycology || Disease, famine, mind-control || {{w|Mycology}} is the study of {{w|fungi}}. Fungi cannot move very far on their own, but their spores could easily spread, therefore, escape probability has been deemed medium high. However, the risk of mycology being used for evil has raised strongly with the release of Star Trek Discovery.
|-
| 91% || 26% || Marine Biology || Sharknado, Jaws, {{w|Cthulhu}} || Villains may keep [[1326: Sharks|a tank of sharks]] in order to dispose of opposition; however, as the linked comic implies, it is difficult to control what sharks will do (they might simply swim away). Randall implies that it's more likely that marine creatures will escape on their own and threaten local swimmers.
|-
| 79% || 16% || Ornithology || Escape: predatory birds; pesky invasive species. Villains may sometimes keep a bird of prey as a pet || Ornithology is the study of birds. The ability to fly makes escape easier for birds than, say, rocks, and it's possible that certain escaped species of birds may {{w|The Birds (film)|threaten the local population directly}} (by pecking/diving at them) or indirectly (perhaps they're an invasive species, capable of outcompeting native birds and unbalancing the local ecosystem).
|-
|}

Note : percentages refer to the position of the center of the smallest enclosing rectangle around each name. 0% and 100% correspond to the low and high arrow tips, respectively.

==Transcript==
:[A chart with two crossing lines with double arrows. Each arrow is labeled:]
:Y axis top: High
:Y axis bottom: Low
:X axis left: Low
:X axis right: High

:[Near each of the "high" ends of the two axis there is a label written in gray, with a line pointing to the relevant axis:]
:Y axis: Risk of your research being used by a supervillain for world domination
:X axis: Risk of the thing you're studying breaking free from your facility and threatening the local population

:[The following points are on the charts upper left quadrant (in reading order):]
:Prosthetics
:Neuroscience
:Laser Optics
:Pharmacology
:Materials Science
:Sociology
:History
:Psychology

:[The following points are on the charts upper right quadrant (in reading order):]
:Robotics
:Genetic Engineering
:Chemistry
:Microbiology

:[The following points are on the charts lower left quadrant (in reading order):]
:Geology
:Linguistics
:Paleontology
:Astronomy
:Molasses Storage
:Dentistry

:[The following points are on the charts lower right quadrant (in reading order):]
:Botany
:Entomology
:Mycology
:Marine Biology
:Ornithology

==Trivia==
* The comic initially had the erroneous spelling "Entymology" (possibly a mistaken mix-up between etymology and entomology, similar to [[1012: Wrong Superhero]]). This was later changed to the correct "Entomology".
* The SSL-Certificate of xkcd expired while this comic was online, causing a non-reachability of the site.

{{comic discussion}}

[[Category:Scatter plots]]
[[Category:Rankings]]
[[Category:Science]]
[[Category:Astronomy]]
[[Category:Chemistry]]
[[Category:Robots]]
[[Category:Physics]]
[[Category:Animals]]
[[Category:Space]]
[[Category:Geology]]
[[Category: Research Papers]]

1398: Snake Facts

2022-05-04T00:44:10Z

172.68.66.63: Undo revision 234878 (vandalism) by X. K. C. D. (talk)

{{comic
| number = 1398
| date = July 23, 2014
| title = Snake Facts
| image = snake facts.png
| titletext = Biologically speaking, what we call a 'snake' is actually a human digestive tract which has escaped from its host.
}}

==Explanation==
This is the first comic using [[:Category:Facts|Facts]] in the title, but only the second to use a fact that is not a [[:Category:Fun fact|Fun fact]].

The comic lists a few ''{{w|Lie|factoids}}'' about snakes, ranging from the mildly informative to the strictly {{w|tongue-in-cheek}}.

The first factoid references the hypothesis that {{w|snake venom}} {{w|Evolution of snake venom|was an evolutionary development of}} {{w|saliva}} that, over time, gradually became more toxic as snakes with saliva that was able to assist in subduing their prey possessed an evolutionary advantage. It then posits that the evolutionary branch that developed into venomous snakes began with a snake whose mutation gave him a mouth that was 'slightly more gross than usual', probably in reference to {{w|bad breath}}.

Additionally, the comic illustration accompanying the second factoid colors in a '{{w|habitat}} range' on a map of South America that is snake-shaped, implying that when it states 'The longest snake is found in {{w|Brazil}}, {{w|Peru}}, and {{w|Chile}}' that this snake is so long that it literally stretches from Brazil, across part of Peru, into Chile, and that the 'habitat' shaded on the map is, in fact, this mammoth snake's {{w|silhouette}}. The age, length and location of the snake are so exaggerated that they are obviously untrue, but may be a reference to the {{w|green anaconda}}, one of the world's largest snakes, which inhabits this region.

The final factoid is entirely tongue-in-cheek. Many factoids come in the form "If you laid all the X end to end, Y would occur" (e.g. "If you laid all the veins and arteries in the human body end-to-end, they would stretch 60,000 miles"). The Y portion of the factoid is supposed to be surprising; therefore, it is ironic that the factoid in the comic, "If you laid all the bones in a snake end to end, you would have a snake.", is obvious and not at all exciting. Clearly, you would not have an entire snake, literally, but you would have a skeleton that was recognizably that of a snake and could reasonably be referred to as 'a snake'. A common example that pokes fun at this format is, "If you laid every elephant from end to end between the Earth and the Moon, then you'd have a lot of dead elephants."

The title text presents the amusing idea that 'snakes' as we know them are not, in fact, a suborder of reptiles but are instead human {{w|digestive tract}}s that, rather than being a system of organs, are creatures capable of escaping from their 'host' human and living independently. The idea seems to follow from the superficial resemblance between snakes and the human digestive tract as long, roughly tubular collections of animal matter, which can process the food entering the top end, and get rid of the waste through the other end.

[[Randall]] had previously posted an [[Media:snake facts old.png|incorrect map]], that included the snake's habitat in {{w|Bolivia}} instead of Peru.

==Transcript==
:'''Snake Facts:'''
:Snake venom evolved from saliva, which means that it all started with a snake whose mouth was sliiiightly more gross than usual.
:[Picture of a snake below the text above.]
:Snake: Hi guys!
:Off-panel voice: Eww, it's Frank.
:[Map of South America with gray shade in the form of a snake. Text to the left of it.]
:The world's longest snake is found in Brazil, Peru, and Chile. It is believed to be over 60 years old.
:[Picture of a snake skeleton between the first and the second of the lines below.]
:If you laid all the bones in a snake end-to-end,
:you would have a snake

==Trivia==
Given the habitat listed for the second factoid, it is likely the comic is referring to the Green Anaconda ''({{w|Eunectes murinus}})''.
*The Green Anaconda's habitat range includes Colombia, Venezuela, the Guianas, Ecuador, Bolivia, Brazil, Peru, the island of Trinidad, and Paraguay.
*The Green Anaconda is one of the longest snakes in the world reaching more than 6.6 m long.
*Anacondas generally do not live beyond 20 years in captivity, and likely less in the wild.
*Since anacondas are reported to continue growing throughout their lives, a 60 year old specimen would likely be the longest snake in the world.
*The Reticulated Python ''({{w|Python reticulatus}})'' is recognized as the longest, but not heaviest, snake and grow to more than 6.95 m.
*The Reticulated Python's habitat is in Southeast Asia.

{{comic discussion}}

[[Category:Facts]]
[[Category:Animals]]
[[Category:Biology]]

385: How it Works

2022-05-04T00:43:28Z

172.68.66.63: Undo revision 233932 by X. K. C. D. (talk)

{{comic
| number = 385
| date = February 18, 2008
| title = How It Works
| image = how it works.png
| titletext = It's pi plus C, of course.
}}

==Explanation==
The comic reveals discriminative jargon against women when doing tasks such as mathematics. When a guy does something wrong, it's his own mistake. When a girl does something wrong, it is taken as a confirmation that girls are inferior.

The mathematics displayed is neither {{w|semantically}} nor {{w|syntactically}} correct. To begin with, there should (reasonably) be a ''dx'' after x2. Adding this, we have an {{w|indefinite integral}} on the left hand side.

The answer {{w|π}} is just nonsensical: What we want is a {{w|Function (mathematics)|function}} whose {{w|derivative}} is x2. Now, x3/3 satisfies this condition. However, since adding a {{w|constant (mathematics)|constant}} to a function does not change its derivative, the full answer is (any function of the form) x3/3 {{w|Constant of integration|+ C}}, where C is any fixed number. The "plus a constant" part is very easy to forget, and might even be omitted by a (sloppy) professional mathematician. So if someone really gave the answer π, "you forgot to add a constant" would be a pretty funny remark, because in one way it's true, but on the other hand it wouldn't quite be the main thing to worry about. (It is especially inane as π itself ''is'' a constant.)

It would also be possible to fix the equation by adding [http://www.mathwords.com/b/bounds_of_integration.htm bounds of integration], so that {{w|π}} becomes the area below a section of the curve x2. That is called a definite integral, and there would be no "+ C". The bounds would have to be somewhat awkward though; if 0 was the lower bound, the cube root of 3π would have to be the upper.

==Transcript==
:[Cueball and a friend stand at a blackboard. The friend is writing, in standard mathematical notation, that the integral of x squared equals pi. No differential or bounds are given for the integral.]
:Cueball: Wow, you suck at math.
:[The same scene, except the writer is Megan.]
:Cueball: Wow, girls suck at math.

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

9: Serenity is coming out tomorrow

2022-05-04T00:43:17Z

172.68.66.63: Undo revision 233751 (vandalism) by X. K. C. D. (talk)

{{comic
| number = 9
| date = September 30, 2005
| title = Serenity is coming out tomorrow
| image = firefly.jpg
| titletext = Mal, Simon, Wash, Zoe, River, Kaylee, Jayne, Inara, Book.
}}

==Explanation==
This comic is about the release of the movie ''{{w|Serenity (2005 film)|Serenity}}'', which was the followup to {{w|Joss Whedon}}'s TV show, ''{{w|Firefly (TV series)|Firefly}}'', which was cancelled by {{w|Fox Broadcasting Company|Fox}} after only one season. Plus, three episodes were not shown on Fox but debuted on {{w|Sci Fi Channel}} in the UK. The show was followed by a devoted number of fans who were outraged by the cancellation of the show. High DVD sales and strong fan support allowed the follow up film Serenity to be created, which tied up many of the loose ends that Firefly left open, such as the cause of {{w|List of Firefly characters#River Tam|River}}'s abilities and the origins of the {{w|Reaver (Firefly)|Reavers}}.

The image shows the main characters of Firefly. From left to right:
*{{w|Malcolm Reynolds|Malcolm "Mal" Reynolds}} - the ship's captain.
*{{w|Simon Tam}} - a doctor trying to rescue his sister.
*{{w|Hoban Washburne|Hoban "Wash" Washburne}} - the ship's pilot.
*{{w|Zoe Washburne}} - the ship's second-in-command.
*{{w|River Tam}} - Simon's sister, who displays superhuman capabilities, but is crippled by alliance research.
*{{w|Kaylee Frye}} - the ship's happy-go-lucky mechanic.
*{{w|Jayne Cobb}} - the hired muscle.
*{{w|Inara Serra}} - a companion, the equivalent of a courtesan, but with a greater deal of respect.
*{{w|Derrial Book}} - a shepherd, which is similar to a priest, with a very unknown backstory.

This is the first [[xkcd]] with adorned stick figures (e.g. hair, coats, etc.) to represent distinct characters, which later becomes a standard motif of the comic.

{{w|Nathan Fillion}}, {{w|Summer Glau}}, and {{w|Jewel Staite}}, the actors who play Mal, River, and Kaylee respectively, show up later in Randall's series [[:Category:The Race|The Race]].

==Transcript==
:[Several stick figures stand side by side in a lineup. A forlorn male in a coat, a male with combed hair, a male with spiky hair and arms outstretched enthusiastically, a female with long hair and cornrows, a shorter female with stringy hair falling over her face, an enthusiastic female with arms raised in celebration with shorter hair, a male with short hair and a goatee and hands on hips, a female with curly hair wearing a dress, and a stern-looking man with flyaway hair.]

==Trivia==
*This was the 10th comic originally posted to [[LiveJournal]].
**The previous was [[6: Irony]].
**The next was [[10: Pi Equals]].
*Original title: "Firefly"
*Original [[Randall]] quote: "Drawn in honor of the upcoming Serenity! If you work very hard you can figure out who is who."
*This was one of the [[:Category:First day on LiveJournal|thirteen first comics]] posted to LiveJournal within 12 minutes on Friday September 30, 2005.
*This comic was posted on [[xkcd]] when the web site opened on Sunday the 1st of January 2006.
**It was posted along [[:Category:First day on xkcd|with all 41 comics]] posted before that on LiveJournal as well as a few others.
**The latter explaining why the numbers of these 41 LiveJournal comics ranges from 1-44.
*One of the original drawings drawn on [[:Category:Checkered paper|checkered paper]].

{{comic discussion}}
[[Category:Comics posted on livejournal| 10]]
[[Category:First day on LiveJournal| 10]]
[[Category:First day on xkcd]]
[[Category:Checkered paper]]
[[Category:Firefly]]

1791: Telescopes: Refractor vs Reflector

2022-05-04T00:43:04Z

172.68.66.63: Undo revision 234657 by X. K. C. D. (talk)

{{comic
| number = 1791
| date = January 27, 2017
| title = Telescopes: Refractor vs Reflector
| image = telescopes_refractor_vs_reflector.png
| titletext = On the other hand, the refractor's limited light-gathering means it's unable to make out shadow people or the dark god Chernabog.
}}

==Explanation==
This comic compares two major types of {{w|optical telescope|optical telescopes}}: The {{w|refracting telescope}} and the {{w|reflecting telescope}}. A refracting telescope produces an image with a series of lenses. A reflecting telescope uses mirrors. (A third type, the {{w|catadioptric system}} telescope, uses both mirrors ''and'' lenses. It is not shown here.)

It first looks like the comic is simply trying to show that refracting has many flaws, such as expense, size and visibility (see more [[#The real problems with refracting telescopes|details below]]). However, the punchline invalidates these complaints with the (apparently major) flaw listed with the reflecting telescope: '''It can't see space vampires'''.

The unstated reason for this is that {{w|vampires}}, {{w|Vampire#Apotropaics|according to some cultures}}, cannot be seen in a mirror. As {{w|Space Vampires}} (like earth vampires) are widely believed to be {{w|Vampire#Origins_of_vampire_beliefs|made up}} and thus unlikely to interest most [[1644: Stargazing|stargazers]],{{Citation needed}} this complaint is superfluous, and the reflecting telescope effectively has no flaws in comparison to the refracting telescope. There are other problems, though, with reflecting telescopes see [[#The real problems with reflecting telescope|details below]]. (Also there was a big problem in the [[#Trivia|original version of this comic]]).

Frequently, however, the right-angle transition at the base of the refractor telescope is done with a prism (an "image erector"). This uses the optical principle of total internal reflection. If mirror-non-appearance of vampires is due to the interaction of evil with silver, a refractor using a prism could still see vampires. On this theory, however, the reflector could too, since modern astronomical mirrors are coated with aluminum, not silver.

The title text expands on the seeing of supernatural beings, as another negative point is added to the refracting telescope; it apparently can't see {{w|Shadow person|Shadow People}} or the Slavic god {{w|Chernobog|Chernabog}} (sometimes spelled Chernobog), both of which are important although clearly not as important to the telescope's merit as seeing vampires since the fact is only mentioned in the title text. So of course the refracting telescope is still the best. Of course also neither the {{w|Shadow_person#History_and_folklore|shadow people}} nor {{w|Chernobog#Folklore|the god}} exists{{Citation needed}} so this would likewise be a moot point.

In reality, "shadow people" are a psychological phenomenon wherein humans ascribe human shapes and movements to shadows in dark spaces. Chernobog is a 12th century Slavic deity, whose name translates to ''black god''. His most famous appearance in modern media was in the 1940 Disney movie {{w|Fantasia (1940 film)|''Fantasia''}} (and Disney merchandise is also almost the only place that his name is spelled as Randall spelled it, with an "a" in the middle). Because shadows are dark and the god is also dark, they cannot be seen by the refracting telescope due to the reduced light-gathering which has already been mentioned as a drawback in the main comic.

Telescopes have been the subject of [[:Category:Telescopes|many comics]] on xkcd. Recently one about space telescope was released [[1730: Starshade]] and before that a large "private" telescope was shown in [[1522: Astronomy]].

===The real problems with refracting telescopes===
The basic performance of a telescope is determined by its size: a wider telescope catches more light, making it easier to see faint objects, while a longer telescope is better for high magnification viewing. For looking at stars, the width is actually more important. No matter how much you zoom, a star is too far away to make bigger, but with a big aperture, you can see stars too faint for the naked eye. Planets benefit more from magnification, and distant galaxies need both.

In both respects, it's much easier to make a big reflector telescope than a big refractor one. Since a lens can only be held in place by its edge, the center of a large lens sags due to gravity, distorting the images it produces. This means most refractor telescopes make do with narrow apertures only a couple of inches across. Reflector telescopes are sometimes called "light buckets" because they can have extremely big openings that can catch light from even very faint stars. In addition, because it has a mirror at one end, the reflector telescope is, in effect, twice as long as it appears - a refractor just cannot compete.

Refracting telescopes were only gradually overtaken by reflecting telescopes, however. In the age of {{W|great refractors}}, the largest telescopes in the world were refractors. Reflectors at the time had mirrors surfaced in {{W|speculum metal}} that began to tarnish only months after application, negatively affecting telescope performance. This problem was resolved when it became possible to surface a mirror in silver, but the problems with refractive lenses persist. Because of this, the {{w|List of largest optical telescopes historically|largest optical telescopes ever built}} are reflectors, rather than refractors. In addition, a {{w|liquid mirror telescope}} uses a very cheap, but potentially very large mirror - with the drawback that the telescope can only look straight upwards.

'''Randall's points:'''
*More expensive
**Grinding a high quality lens is more expensive than producing an equivalent mirror - {{w|Crown glass (optics)|crown glass}}, which is needed for good quality telescope lenses, is expensive.
*Less compact
**In theory, a refractor ''could'' be made compact, but the image quality would be awful, because the lens would have to be extremely fat. The longer the telescope is, the less dramatic the focusing needs to be.
*{{w|Chromatic aberration}}:
**In optics, chromatic aberration is an effect resulting from dispersion in which there is a failure of a lens to focus all colors to the same convergence point, producing a rainbow effect around the image familiar to people who wear glasses, and with prisms. It occurs because lenses have different refractive indices for different wavelengths of light. Each colour is therefore focused slightly differently by the lens. Mirrors don't have chromatic aberration, since the light is reflected off the front of the mirror. The {{w|achromatic lens}} can reverse this effect, but it's expensive and its size is limited. Nevertheless, before telescope mirrors were perfected in the early 20th century, the best telescopes were achromatic refractors.
***Note that this effect has also been mentioned in relation to photography by [[Black Hat]] in [[1014: Car Problems]], in a completely different context, but shows this is an issue Randall has considered before.
*Reduced light-gathering
**Apart from generally needing to be smaller than reflector telescopes a further problem comes from glass defects, striae or small air bubbles trapped within the glass. In addition, glass is opaque to certain wavelengths, and even visible light is dimmed by reflection and absorption when it crosses the air-glass interfaces and passes through the glass itself. All of this reduce the light gathered.

'''Other problems not mentioned by Randall:'''
*Suspending a lens
**Another important difference (and a big reason why large refracting telescopes don't exist) is that the lens of a refracting telescope has to be supported by the edges, so that light can pass through it. As a result there comes a point where it is no longer feasible to mount a large lens in a telescope due to its weight and the need to support it from the edges. In contrast the mirror of a reflecting telescope is supported from behind, and any support structures for the primary mirror are not in the path of the light. As a result, substantially larger mirrors can be easily mounted and supported. As an additional benefit this behind-the-mirror support has led to the creation of {{w|Adaptive_Optics|Adaptive Optics}}, a technique (which is impossible for refracting telescopes) that allows some of the atmosphere's distortions to be corrected for.
*A mirror can be segmented to make a larger reflecting surface out of smaller (and hence easier to build/mount/support) mirrors. By using a {{w|Segmented_mirror|segmented mirror}} it is possible to build an effective aperture much larger than what could be built even from a single mirror, which is itself much larger than the largest possible lens that might be built for a refracting telescope.

===The real problems with reflecting telescope===
It is worth noting that (apart from the vampire problem) a reflecting telescope also has disadvantages compared to a refracting telescope:
*The main disadvantage is that in almost all reflecting telescope designs the focal point is directly in front of the mirror, i.e. in between the mirror and the target of interest.
**As a result a {{w|Secondary_mirror|secondary mirror}} is commonly used to direct the focal point somewhere outside of the field of view. However, this secondary mirror (and the struts that support it) will still block part of the field of view - although the focus of the telescope means that the secondary mirror is not visible when looking at distant objects, it will result in diffraction patterns that also hinder the image quality. In fact, this is the source of the {{w|Diffraction_spike|diffraction spikes}} around stars which are commonly seen in astronomical images.
*** {{w|Off-axis reflecting telescope|Off-axis telescopes}} avoid the problem of diffraction from in-path obstructions, they also require larger footprints and more complicated mirror shapes compared to their on-axis counterparts.
*A reflecting telescope is also harder to maintain:
**The mirrors need to be very precisely aligned (this is called {{w|collimation}}), and this can be a laborious process. They may also need re-polishing.
**The telescope is open at one end, allowing dust and dirt to enter.
*A reflecting telescope is not very portable. This is why {{w|Birdwatching|bird-spotters}} use small refractor telescopes as an easy way to get a closer view of birds.

Despite this disadvantage, reflecting telescopes are used almost exclusively in modern astronomy because of practical limitations in making large refracting telescopes. Very few amateur astronomers use refracting telescopes - nowadays, they mostly exist to con people looking for Christmas presents in department stores (just because a telescope promises 100x zoom doesn't mean the image quality is any good!)

On the other hand, reflecting telescopes help astronomers gaze at Beige Gorgons (mentioned in [[2360: Common Star Types|comic 2360: Common Star Types]]).

==Transcript==
:[A one panel comic showing two different telescope designs next to each other with labels above them and a bullet list of points below them. The left drawing will be described first then the right.]

:[Left:]
:<big>Refractor</big>

:[A slim telescope design is shown. At the top the light enters shown in a light yellow shade between two thin parallel light gray lines that just fits inside the opening of the telescope which is slightly wider at the top than at the lens sitting a short way into the opening. The lens causes the light to focus just where the telescope again changes dimensions, and the light enters a small opening at the bottom of the long pipe of the telescope. Here the yellow light is a point as the two gray lines cross each other at that point. The light then broadens slightly again and the thin yellow light cone hits a mirror at the bottom of the telescope and is reflected to the left and out through the eyepiece. Below are the following points:]
:*More expensive
:*Less compact
:*Chromatic aberration
:*Reduced light-gathering

:[Right:]
:<big>Reflector</big>

:[A much broader (more than 150% of the first) but also much shorter (66%) telescope design is shown. At the top the light enters shown in a light yellow shade between two thin parallel light gray lines that still just fits inside the opening of the telescope. On it's way down to the bottom of the telescope the light passes by a small mirror turned down towards the bottom. When the hits the curved bottom mirror light is focus on it's way back back and a small light cone hits the small mirror mentioned before sitting almost at the top of the telescope. This mirror reflects the light to the left into an even thinner light cone that goes out through the eyepiece located near the top of the telescope. Below is the following point:]
:*Can't see space vampires

==Trivia==
In an '''[http://www.explainxkcd.com/wiki/images/archive/b/b2/20170127171253%21telescopes_refractor_vs_reflector.png earlier version]''' of this comic, the eyepiece of the refracting telescope included a mirror, often used with refractors to give an upright image and more comfortable access for the observer. This would of course invalidate the only advantage it has (vampire-visibility) over reflecting telescopes.

[[Randall]] later corrected this so the '''[http://www.explainxkcd.com/wiki/images/b/b2/telescopes_refractor_vs_reflector.png current/final version]''' shows the light going straight out of the end.

An {{w|amici roof prism}} is sometimes used instead of a mirror with refractors, because it does not only deliver an upright image, but also one that is not a mirror image. In a prism, there is only total reflection, which, as opposed to a metal mirror, would probably work on vampires.

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Telescopes]]
[[Category:Rankings]]
[[Category:Science]]
[[Category:Astronomy]]
[[Category:Space]]
[[Category:Religion]]

2329: Universal Rating Scale

2022-05-04T00:42:33Z

172.68.66.63: Undo revision 233003 by X. K. C. D. (talk)

{{comic
| number = 2329
| date = July 6, 2020
| title = Universal Rating Scale
| image = universal_rating_scale.png
| titletext = There are plenty of finer gradations. I got 'critically endangered/extinct in the wild' on my exam, although the curve bumped it all the way up to 'venti.'
}}

==Explanation==
In this comic, [[Randall]] has blended many traditional rating scales to create a "universal rating scale". Unfortunately, the mixing of these scales creates a scale that is impossible to use. Only a subset of the values of each rating scale is included, further weakening its claim as a "universal" scale. The result is much like the attempt to create a "universal standard" in [[927: Standards]].

Alternatively, it can be perceived as a way of comparing the different scales, for instance to answer a question like "Is it worse to get a 2 or an F?"

: '''Scale of zero to ten''' (but with an 11, because people often add that to exaggerate - see {{w|up to eleven}} about the meme)
:: 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11. The number 9 is omitted, possibly because seven ate nine (789) or because nine is the [[1103: Nine|neglected number]].
: '''Competitive scores''', such as for artistic gymnastics' {{w|Code of Points (artistic gymnastics)|Code of Points}}, (ordinarily from 0.0 to a {{w|Perfect 10 (gymnastics)|perfect 10.0}})
:: 10.0
: '''{{w|Likert scale}}'''
:: strongly disagree, disagree, agree, strongly agree (often there is a "neither agree nor disagree" value in the middle, but it is not strictly required)
: '''{{w|School grades}}''' (there are also B, C, D, and others with + or -)
:: F, A+
:: S - Schools in Japan may use the {{w|Academic grading in Japan|S grading}}, which is said to stand for [https://en.wiktionary.org/wiki/S#Etymology_1_2 "superior"], implying “even better than A.” The expression S is also used in daily life, generally perceived as an S in '''s'''pecial or '''s'''uper, here unrelated to the academic grading system. For example, the most expensive seat in a theater (e.g. a balcony seat) may be called ''S-seki'' (lit. “S seat”) in Japanese, while the second most expensive seat may be called ''A-seki''. Many video games also use S grading, and some (such as Beat Saber and Dance Dance Revolution) use SS, SSS, and even more S's as ranks above that (though these are not shown in the webcomic). A possibly related expression is “Super S” as in {{w|Sailor Moon (TV series)|''Sailor Moon SuperS''}}.
: '''{{w|Star (classification)|Star rating}}'''
:: 1 star, 2 stars, 3 stars, 4 stars, frequently used to rate restaurants, films etc. 5 star is omitted, probably due to Randall's opinion that items with 5 stars [[1098: Star Ratings|tend to only have had one rater and aren't trustworthy]].
: '''{{w|Conservation status}}''' (this is only a subset of the nine groups in the {{w|International Union for Conservation of Nature}} (IUCN) Red List of Threatened Species)
:: extinct, critical (probably critical''ly endangered''), endangered, least concern
:: According to the title text, "extinct in the wild" is a half-step below "critical", presumably above "G".
: '''{{w|Starbucks#Products|Starbucks brand beverage sizes}}''' (there is also short and trenta)
:: tall, grande, venti
: '''MPAA age-appropriate {{w|Motion Picture Association film rating system|film ratings}}''' took effect November 1, 1968 with G, M (now PG), R (not shown in comic) and X (now NC-17)
:: G, PG (as of February 11, 1972, {{w|Motion Picture Association film rating system#From M to GP to PG|replaced GP}}), {{w|PG-13}} ({{w|Motion Picture Association film rating system#Addition of the PG-13 rating|introduced}} July 1, 1984), {{w|NC-17}} (introduced September 1990, {{w|Motion Picture Association film rating system#X replaced by NC-17|replaced X}})
: '''ESRB age-appropriate {{w|Entertainment_Software_Rating_Board#Ratings|ratings}}''' for video games (there is also EC for early childhood, E for everyone, E10+ for Everyone 10+, M for Mature, and AO for Adults Only)
:: T for teen
: '''Happiness emojis''' (alternately, the '''{{w|Wong–Baker Faces Pain Rating Scale}}''')
:: Frowny face (☹, U+2639), neutral face (😐, U+1F610), smiley face (☺, U+263A). It is not totally clear which emoji each symbol is meant to refer to. The unhappy face could be [https://emojipedia.org/worried-face Worried Face] 😟, [https://emojipedia.org/anguished-face/ Anguished Face] 😧, [https://emojipedia.org/frowning-face/ Frowning Face] ☹️ (note the lack of eyebrows), [https://emojipedia.org/slightly-frowning-face/ Slightly Frowning Face] 🙁 etc.
: '''{{w|Coin grading|Coin grades}}'''
:: G, VG, UNC meaning good, very good, and uncirculated respectively
: '''Hurricane/cyclone strengths''', {{w|Saffir–Simpson scale}} (ordinarily categorized from category 1 to category 5)
:: Category 5
: '''Tornado intensities''', {{w|enhanced Fujita scale}} (ordinarily categorized from EF0 to EF5)
:: EF-5
: '''Credit (and other) ratings'''
:: A, AA, AAA
:: Credit rating agencies will rank businesses and governments based on their likely ability to pay back their creditors' interest ratings. The very highest are rated AAA, and then (in Standard & Poor's scheme) AA+, AA, AA-, A+, and so on. (Note that Randall's scale rates A+ as better than AA, indicating that it's the "A+" from school grades rather than the one from Standard & Poor's list.)
:: This could also be a reference to battery sizes. This would imply that AAA is better than AA, which is not necessarily true, but funny to think about.
:: Alternatively, this could be a reference to sports tier divisions; where AA and AAA basketball for example promote age and skill appropriate competition.

The title text suggests that the scale as shown here is incomplete, by referencing further gradings that are not shown in the table. {{w|Critically endangered}} and {{w|Extinct in the wild}} are real conservation status categories recognised by the IUCN, although it's not clear what "Critically endangered/extinct in the wild" would mean - perhaps the "possibly extinct in the wild" designation, abbreviated CR(PEW). It would presumably fit on the table somewhere between "Extinct" and "Critical", although its ordering relative to "tall", "2" and "G" is unclear.

The title text suggests that a score at this level had been {{w|Grading on a curve|graded on a curve}}, which bumped its rating up to "Venti", which is on the table, two steps below "Least concern". This would be an extraordinary example of such a curve, pushing the score from approximately 2/10 to almost 8/10. This could only happen if the exam was extremely difficult, meaning most results were significantly below 2/10.

==Transcript==
: [Caption above the frame:]
: Universal Rating Scale

: [A vertical scale, with 45 gradations, labelled. These are the grades:]
: 0
: 1
: Strongly Disagree
: F
: [star] ☆
: Extinct
: Tall
: 2
: G
: Critical
: [frowny face] ☹
: 3
: endangered
: [two stars] ☆☆
: PG
: Disagree
: VG
: 4
: Grande
: 5
: PG-13
: [neutral face] 😐
: 6
: T for Teen
: 7
: [three stars] ☆☆☆
: Agree
: Venti
: 8
: Least Concern
: [smiley face] ☺
: A
: Strongly Agree
: Category 5
: EF-5
: NC-17
: UNC
: AA
: [four stars] ☆☆☆☆
: A+
: S
: AAA
: 10
: 10.0
: 11

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

2592: False Dichotomy

2022-05-04T00:42:30Z

172.68.66.63: Undo revision 235139 (vandalism) by X. K. C. D. (talk)

{{comic
| number = 2592
| date = March 11, 2022
| title = False Dichotomy
| image = false_dichotomy.png
| titletext = There are two types of dichotomy: False dichotomies, true dichotomies, and surprise trichotomies.
}}

==Explanation==
A dichotomy is two alternatives which are normally mutually exclusive (such as the dichotomy between a flat Earth and non-flat Earth). A {{w|false dichotomy}} is a {{w|logical fallacy}} based on an incorrect perception of limited options (for example: if the page background isn't white, it is black).

[[Cueball]] has apparently made one such error and is being called out by [[White Hat]] for it. Upon having this pointed out to him, Cueball says that we must '''embrace''' false dichotomies, because the '''only other option''' is {{w|cannibalism}}. This statement is another false dichotomy, as presenting false dichotomies is not the only alternative to cannibalism{{Citation needed}}. The reverse (that cannibalism is incompatible with expressing false dichotomies) is also not potentially true, as eating people may eventually result in having nobody you need to present false dichotomies to.

Cueball has thus created another false dichotomy to excuse his first.

The false dichotomy Cueball appears to be referring to is the notion that those identified as human must not be eaten, but even closely related animals are not human and can be eaten, i.e. species can be divided clearly between "human" and "food". If this dichotomy is not accepted, then consuming any species that shares, for instance, any significant percentage of DNA with humans could be considered a measure of cannibalism.

The title text states that there are two kinds of dichotomies, making a dichotomy in itself. Due to three types of dichotomy being mentioned, and only two being foreshadowed, this statement is itself a surprise trichotomy, or three-parted choice. The title text is a variation of the [https://tropedia.fandom.com/wiki/There_Are_Two_Kinds_of_People_in_the_World "Two kinds of People"] joke. The classic math nerd variant is "There are three kinds of people in the world, those who can count, and those who can't." Alternatively, it may refer to a variation about {{w|base 2|binary}}. The original joke usually goes something like this: "There are 10 types of people: those who know binary, and those who don't." The variation is usually something like the following: "There are 10 types of people: those who know binary, and those who don't, and those who weren't expecting a {{w|base 3|ternary}} joke." Another version of this kind of joke is "there are two kinds of people: those who can extrapolate from an incomplete data set,"

The word {{wiktionary|trichotomy}} is a relative neologism, to be understood as to mean "divided into (or amongst) three parts", having replaced the original prefix "di-" (a factor of two, either doubled or, by context, halved) with that of "tri-" (similarly tripled/thirded). Strictly, though, {{wiktionary|dichotomy}} more directly stems from Greek elements that say "apart, I cut", with "apart" being represented by the "dicho-" (itself being roughly "into two", or to separate) which does not have a direct "tricho-" equivalent, although it does ultimately derive from "duo", Greek for "two". This is the kind of linguistic nuance that [[Randall]] clearly enjoys, yet may also happily or carelessly (mis)use without compunction.

==Transcript==
:[White Hat and Cueball are talking to each other. White Hat has his arms spread outwards in exasperation, while Cueball gestures assertively with his pointer finger.]
:White Hat: That's a false dichotomy!
:Cueball: Yes, but we have to embrace false dichotomies, because the only alternative is cannibalism.

{{comic discussion}}
[[Category:Comics featuring White Hat]]
[[Category:Comics featuring Cueball]]
[[Category:Language]]
[[Category:Self-reference]]

1559: Driving

2022-05-04T00:41:53Z

172.68.66.63: Undo revision 232740 by X. K. C. D. (talk)

{{comic
| number = 1559
| date = August 3, 2015
| title = Driving
| image = driving.png
| titletext = Sadly, it probably won't even have enough gas to make it to the first border crossing.}}

==Explanation==
A {{w|self-driving car}} is a car that requires no human interaction to navigate streets to a destination. Thus, when [[Black Hat]] places a rock that weighs "as much as a small adult" into the car's seat, he begins the process of fooling the car into thinking it has an occupant when it does not. His purpose in doing so appears to be to send the car to {{w|Anchorage}}, {{w|Alaska}}, which is presumably quite far from where Black Hat and [[Cueball]] are standing, thus taking the car far away from its owner with relatively little effort on the part of Black Hat. This is yet another evil prank from xkcd's resident [[classhole]].

The title text references the fact that driving to Alaska from the {{w|contiguous 48 states|contiguous lower 48 states}} requires two border crossings, once into {{w|Canada}} from the mainland, and once from Canada into Alaska. The car apparently begins some distance from the Canadian border, since it will likely run out of gas before reaching Canada. Title text expresses regret about this probable failure; perhaps Randall was looking forward to the encounter between the border guards and the vehicle's "occupant." However, even if the car does not get to Anchorage, Black Hat will have created a serious problem for its owner who will have to report the car as stolen.

Shortly after this comic appeared, Tesla released footage of a robotic charger that can [http://www.bbc.co.uk/news/technology-33794085 connect itself to a Tesla automatically.] If this kind of technology becomes common then a self-driving electric car might be able to make a transcontinental journey without human intervention.

At the time of the release of this comic there were no places where self-driving cars were for sale to individuals. However, several corporate-owned test cars are frequently seen on public roads (such as those operated by Google among others). {{w|Google_driverless_car|Nevada, Florida, California and Michigan}} were the first states to allow the testing of self-driving cars on public roads, and this legality is quickly spreading to many other states, as well as several countries in Europe. Alternatively, Randall might be setting this comic in an idyllic near future, wherein you could drive all over the country (and Canada) with these cars!

It could have been [[Beret Guy|Beret Guy's]] car - see [[1493: Meeting]]. Self-driving cars are a [[:Category:Self-driving cars|recurring topic]] on xkcd.

==Transcript==
:[Black Hat, carrying a rock, is walking toward Cueball, leaving a trail of sand.]
:Black Hat: Would you guess this weighs as much as a small adult?
:Cueball: What?
:Cueball: Uh, probably.

:[Black Hat walks past Cueball who turns to look after him.]
:Black Hat: Great!

:[Black Hat has walked out of the frame. Cueball is looking in the direction he left in. Several noises and voices are coming from off-panel.]
:Off-panel: <nowiki>*</nowiki>Thump*
:Car voice (off-panel): ''Please fasten your seatbelt.''
:Off-panel: <nowiki>*</nowiki>click*
:Black Hat (off-panel): Take me to Anchorage, Alaska.
:Car voice (off-panel): ''Navigating''
:Off-panel: <nowiki>*</nowiki>slam*

:[Black Hat walks back in the panel towards Cueball.]
:Car driving off:''Vrrrrrrrrrrrrrrrrrrrrrrr''
:Black Hat: I love self-driving cars.
:Cueball: ...Whose car was that?
:Black Hat: Dunno, but they shouldn't have left it running.

{{comic discussion}}

[[Category:Comics featuring Black Hat]]
[[Category:Comics featuring Cueball]]
[[Category:Self-driving cars]]
[[Category:Sabotage]]

774: Atheists

2022-05-04T00:41:15Z

172.68.66.63: Undo revision 234867 by X. K. C. D. (talk)

{{comic
| number = 774
| date = August 2, 2010
| title = Atheists
| image = atheists.png
| titletext = 'But you're using that same tactic to try to feel superior to me, too!' 'Sorry, that accusation expires after one use per conversation.'
}}

==Explanation==
In public debates, some {{w|Christian fundamentalism|fundamentalist}} {{w|Christian}}s and some {{w|atheist}}s, while having different opinions, can behave surprisingly similar. Both can be very {{w|dogmatic}} about their beliefs, and be very disrespectful and accusative towards people of the other standpoint. [[Cueball]] is blaming both parties for being annoying. [[Megan]] sarcastically remarks that Cueball then must feel superior to just about everyone.

The title text takes this one step further when Cueball realizes that Megan's reply is just as smugly superior as his. For practical reasons (that is, the prevention of an endless, useless thought loop about your own thought process), Megan stops the tactic, by humorously stating that the statement expires after one use in a conversation. Of course, statements cannot expire.{{Citation needed}}

==Transcript==
:[Cueball and Megan talking. Cueball has his palm out.]
:Cueball: Personally, I find atheists just as annoying as fundamentalist Christians.
:Megan: Well, the important thing is that you've found a way to feel superior to both.

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

Talk:2614: 2

2022-05-03T03:35:16Z

172.68.66.63:

Hello people. Anyone got an explanation for this? [[Special:Contributions/172.70.114.229|172.70.114.229]] 22:59, 2 May 2022 (UTC)

To the person who has requested a citation that two is a number... here you go: https://youtu.be/dBVoIUASFS0?t=82. Can someone who knows how to add citations add it? :D --[[Special:Contributions/172.70.110.209|172.70.110.209]] 23:09, 2 May 2022 (UTC)
:The [citation needed] thing is a running joke here thanks to [[285: Wikipedian Protester]]. It's used for obvious statements of fact on this wiki as a joke (basically the opposite of its Wikipedia use). [[User:KirbyDude25|KirbyDude25]] ([[User talk:KirbyDude25|talk]]) 00:43, 3 May 2022 (UTC)
::I'm sorry to inform you that you probably became another victim of Poe's law (or "r/whooosh", as kids say these days). I was just playing the [https://www.smbc-comics.com/comic/game SMBC citation game]. --[[Special:Contributions/172.70.110.209|172.70.110.209]] 02:08, 3 May 2022 (UTC)

Hey all, the group theory thing reminds me a lot of cyclic groups or ideals generated by the value 2. Also equivalence classes (which come up in group theory) can be written with [brackets] but may be confused with <cyclic groups> or (ideals).

The 2;2 notation looks like the notation \mu; \nu that is used for covariant derivatives of tensors in physics. Also 2,2 looks like \mu, \nu that is used for partial derivatives of tensors. And as mentioned above, (2) could be a cyclic subgroup or ideal generated by two or a special case of cycle notation for elements of symmetry groups used to mean an element that keeps 2 fixed. [[Special:Contributions/162.158.62.120|162.158.62.120]] 23:32, 2 May 2022 (UTC)

I second the point about tensors. Maybe you could expand the summation notation slightly. It's common to use index sets or rules underneath large symbols for all sorts of things, like sums, products, direct sums, direct products, unions, intersections, integrals, and much, much more. So here, the large 2 in parentheses represents one of these symbols. Rather than adding or multiplying the elements or whatever, you are twoing them, whatever that means. You are twoing over all values of 2, apparently. It's sort of reminiscent of jokes with punchlines like "for sufficiently large values of 2." There are of course, different 2s out there. Like, there is the von Neumann ordinal 2, the integer 2, the rational number 2, the real number 2, the complex number 2, the residue class of 2 mod 3, etc. All of these may be represented by 2. Perhaps we are indexing over some collection of canonical representations of 2? [[Special:Contributions/172.70.130.161|172.70.130.161]] 00:02, 3 May 2022 (UTC)

Explanation needs something about one of the 2s being cursed. Also, this should be added to the category for cursed stuff (I think it's cursed things, but did not look it up). [[Special:Contributions/172.70.211.72|172.70.211.72]] 01:37, 3 May 2022 (UTC)

Superscript or subscripts before a thing can indicate tetration and pentation. [[Special:Contributions/172.68.66.63|172.68.66.63]] 03:35, 3 May 2022 (UTC)