explain xkcd - User contributions [en]

Talk:1255: Columbus

2023-03-11T17:30:42Z

172.70.175.146:

Megan's version of the story is one big reference to the {{w|Silmarillion}}, in case you're wondering. [[Special:Contributions/100.40.49.22|100.40.49.22]] 06:00, 23 August 2013 (UTC)

I fail to see how the fact scholars and other educated people knew the Earth is round means he couldn't have difficulty getting sponsorship because of that. He wasn't asking scholars for sponsorship, did he? :-) Actually, according to {{w|Christopher_Columbus#Quest_for_support|wikipedia}}, "Columbus presented his plans to Queen Isabella, who, in turn, referred it to a '''committee'''" ... -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 09:14, 23 August 2013 (UTC)

Because it wasn't just scholars - ''everyone'' knew that the world was a sphere. Sailors, for example, took the monumental task of noticing that when objects appeared in the distance, they seemed to "rise up" over the horizon (hence the phrase). For that to happen, the sea (and by extension the rest of the world) had to be curved.
[[Special:Contributions/109.76.209.186|109.76.209.186]] 12:08, 23 August 2013 (UTC)

: Farmers were famous for believing the world was flat, but it might as well just be city prejudice or jokes on farmers behalf. They would anyway be in the worst position to know any better. [[Special:Contributions/62.220.2.194|62.220.2.194]] 12:30, 23 August 2013 (UTC)

:: I was trying to make a joke. According to wikipedia again, it is recorded that the committee denied the request because of distance to Asia, therefore shown much more intelligence that committees tend to have on average. Still, he asked for sponsorship multiple people, which might include some who believed earth is flat. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 11:07, 24 August 2013 (UTC)

Looking at the moon and at the earth's shadow during a lunar eclipse would probably make many realize the earth is round. [[User:Ghaller825|Ghaller825]] ([[User talk:Ghaller825|talk]]) 12:45, 23 August 2013 (UTC)
:Unless "round" as in "circular", rather than "spherical". A disc-like Earth could give the same effect. A ''non-tidally-locked moon'' would have been an interesting thing for early understanding of the universe, as it would have shown a clearly spherical ball rotating and let the layperson imagine sphericality under their own feet a lot easier in their own childhood, thus flat-earthing would have been culturally invalid, not just lazy/unthinking. Whether or not farmers 'knew'/cared/were-told-by-the-church that the world was flat isn't really relevent on the scale of farming where you need to worry more about localised hills on your land than global curvature on its actual order of magnitude. Of course, in the absence of any other clues you tend to think of everything as flat as your (crudely worked) kitchen tabletop by default. [[Special:Contributions/178.104.103.140|178.104.103.140]] 16:16, 23 August 2013 (UTC)

I am not sure what people knew and what they believed in earlier times. For example: {{w|M-Theory}} says that the space we live in has 11 dimensions. Assuming this is correct, what will people in 500 years say about us? Did we know it or did we not? Could we have expected what will hit us in a couple of years from out of one of the dimensions that we do not visually perceive?
To apply this to the quesion of whether they knew that the world was round: There is a {{w|Deep-sea_exploration#Milestones_of_deep_sea_exploration|story}} about Magellan (who certainly believed that the world was round because he tried to sail around it): He tried to measure the depth of the ocean with a 700m long rope. When the rope failed to reach the bottom, he concluded that the ocean was infinitely deep. Now how can a round object with a finite perimeter have and infinite radius? (I realize that wikipedia does not give any sources for the story and its origin is somewhat obscure, someone translated the story from the German wikipedia in July 2011; in the German wikipedia it had first appeared in 2006, but the story was around on German language websites since at least [http://www.scinexx.de/dossier-detail-40-11.html 2000]; I have no idea where it originally comes from, but it would be interesting to have a look at Magellan's ship's log if it had such a thing.)
[[User:Y4cy|Y4cy]] ([[User talk:Y4cy|talk]]) 13:41, 23 August 2013 (UTC)

:You suppose that the round earth is imbedded in flat 3-dimensional space. If it were’nt, you could easily have infinitely deep oceans. Maybe Magellan was way ahead of his time by thinking in non-Euclidean categories.
:(Explanation for non-mathematicians: Draw a circle – it surely has a finite radius, but if you measure the depth perpendicular to the sheet of paper, you could go infinitely deep. Now apply this to a round sphere and measure perpendicular to the 3D space you put it in.)
:--[[Special:Contributions/188.102.28.80|188.102.28.80]] 09:41, 24 August 2013 (UTC)

::Your example fails. Magellan sailed in ship with keel pointing in the direction of the depth he tried to measure. His success depended on the fact that earth is round IN THAT DIMENSION. Sure, there are geometries where the earth can be round in that dimension AND ocean would still be infinite, but, as you correctly mentioned, they would be non-euclidean, while your example with sheet of paper is (almost) euclidean. Also, dimension which would make possible to measure infinite distances is {{w|Brane cosmology}} - {{w|M-Theory}} would work perfectly well even in case all of those "extra" dimensions would be extremely small. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 11:07, 24 August 2013 (UTC)

:[http://www.wdl.org/en/item/3082/ Journal of Magellan's Voyage] is an original source (in French) accessible online of this voyage, which could contain this story. Sebastian --[[Special:Contributions/178.26.118.249|178.26.118.249]] 19:36, 24 August 2013 (UTC)

[http://www.glyphweb.com/arda/a/arda.html Arda] was not [http://www.glyphweb.com/arda/b/bentworld.html bent] until the [http://www.glyphweb.com/arda/d/downfallofnumenor.html Downfall of Númenor] in [http://www.glyphweb.com/arda/chronicle.html?startyear=3319&startage=2 S.A. 3319]. When [http://www.glyphweb.com/arda/e/earendil.html Eärendil] sailed into [http://www.glyphweb.com/arda/w/west.html the West] in [http://www.glyphweb.com/arda/chronicle.html?startyear=538&startage=1 F.A. 538] he did so on a topologically flat earth. It was the [http://www.glyphweb.com/arda/i/istari.html Istari], the [http://www.glyphweb.com/arda/g/greyelves.html Sindarin] belatedly answering the [http://www.glyphweb.com/arda/g/greatjourney.html summons of the Valar], [http://www.glyphweb.com/arda/g/galadriel.html Galadriel] of the [http://www.glyphweb.com/arda/n/noldor.html Noldorin], [http://www.glyphweb.com/arda/e/elrond.html Elrond] [http://www.glyphweb.com/arda/h/halfelven.html half-Elven], and the [http://www.glyphweb.com/arda/r/ringbearers.html ring-bearers] of the [http://www.glyphweb.com/arda/t/thirdage.html third age] who took the [http://www.glyphweb.com/arda/s/straightroad.html straight road] to [http://www.glyphweb.com/arda/v/valinor.html Valinor]. --[[User:April_Arcus|April Arcus]] 01:44, 25 August 2013 (UTC)
* Nerrrrrrrrrrrrrrrrrd. :) --[[User:V2Blast|V2Blast]] ([[User talk:V2Blast|talk]]) 07:34, 27 August 2013 (UTC)
: Oh yah, 'cos the rest of the comments/conversation on this page are just soooo hip :P [[User:Orazor|Orazor]] ([[User talk:Orazor|talk]]) 10:11, 30 September 2014 (UTC)

How is the title text related to the title text in 1256? Does Arwen visit the Undying Lands? [[User:Jd2718|Jd2718]] ([[User talk:Jd2718|talk]]) 12:06, 5 September 2013 (UTC)

I'm pretty sure Valar are immune to disease... [[Special:Contributions/199.27.128.150|199.27.128.150]] 22:26, 28 December 2013 (UTC)
:And ''I'm'' pretty sure valar morghulis... wait, what? [[User:Orazor|Orazor]] ([[User talk:Orazor|talk]]) 10:11, 30 September 2014 (UTC)
:Valar, Maiar, and Elves are all disease-immune. Valar and Maiar can actually shed their physical bodies entirely. [[Special:Contributions/108.162.221.40|108.162.221.40]] 13:39, 13 July 2015 (UTC)
While the main inhabitants of the Undying Lands are undying in their own right, it may be that they also confer immortality. As I recall, the Numenorean invasion was based upon that belief. [[User:Magic9mushroom|Magic9mushroom]] ([[User talk:Magic9mushroom|talk]]) 10:38, 10 September 2016 (UTC)

I thought the morning star was Polaris. How did it become the planet Venus?
:You were incorrect. Polaris is the (Northern Hemisphere) North Star, not the morning star. [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 12:32, 23 November 2021 (UTC)
:: It's also the southern hemisphere North Star. It's just always below the horizon (as is the celestial north pole) so it isn't really all that useful. [[Special:Contributions/172.70.175.146|172.70.175.146]] 17:30, 11 March 2023 (UTC)

2688: Bubble Universes

2022-10-21T16:59:53Z

172.70.175.146:

{{comic
| number = 2688
| date = October 21, 2022
| title = Bubble Universes
| image = bubble_universes_2x.png
| imagesize = 740x188px
| noexpand = true
| titletext = The theory finally unifies cosmic inflation and regular inflation.
}}

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

The comic seems to be recursive, where one Cueball's bubble universe contains another Cueball doing the same thing, blowing bubbles, seeming to contain the whole scene within one of the bubbles in the original scene.

This may reference cosmological models like the {{w|Big Bounce}} where a new universe emerges from a previous universe. Similarly e.g. "it's turtles all the way down" but here the universe is suspended in bubbles, and those bubbles suspended in a universe suspended in bubbles, "all the way down" (or at least one layer down).

"Finally unifies cosmic inflation and regular inflation" where "regular inflation" refers to the inflation of bubbles. Cosmic inflation refers to the expansionary phase of the universe shortly after the Big Bang; this would explain why that happened with the simple proposition that it was a bubble and inflated like regular bubbles do. (Ignoring various issues like the sheer size of the universe.)

The scene looks like it could be part of an infinite recursion, but not exactly: the two Cueballs and grounds are similar but not identical.

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

[Cueball blowing expanding bubbles. In the largest one is a whole new universe with another Cueball blowing similar bubbles. The bubbles are progressively darker: the first ones are regular transparent/white bubbles, and as they grow, they turn grey then dark, to match the black night sky, with stars, galaxies, planets and other astronomical bodies]

Title text: This theory finally unifies cosmic inflation and regular inflation

{{comic discussion}}

2687: Division Notation

2022-10-19T23:02:38Z

172.70.175.146: /* Explanation */ Added link to topic

{{comic
| number = 2687
| date = October 19, 2022
| title = Division Notation
| image = division_notation_2x.png
| imagesize = 235x310px
| noexpand = true
| titletext = Science tip: Scientists hardly ever use the two-dot division sign, and when they do it often doesn't even mean division, but they still get REALLY mad when you repurpose it to write stuff like SALE! ALL SHOES 30÷ OFF!
}}

==Explanation==
{{incomplete|Created by a GROUP OF SCHOOLCHILDREN DIVIDED AMONGST THEMSELVES - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

This comic pokes fun at some of the ways to write the {{w|Division (mathematics)|division}} operation in math. In this comic, Randall has used A as the dividend (the number being divided) and B as the divisor (the number that A is divided by).
The first two are respectively the division sign (÷) and long division symbol. (Note: the long division symbol is only used in English-speaking countries). These methods of division are often used by school children as the first ÷ is what people learn when first learning division, and the second long division symbol is usually the first type of long division learned (it's easier to do it visually on paper that way).

The third line is the way the division is often written in code. The 4 standard operations in programming usually are +, -, *, /. This one was missing in the first version of the comic.

The fourth notation is the way division is written in science, dividend on top line and divided on bottom line.

The fifth notation uses a negative exponent. The exponent -1 has the same effect as dividing by the base. It can be used to keep an equation on 1 line.

The final form of notation appears to be not a simple notation for division. Rather, it looks like a definition of a notion of division which is customized to a particular setting. This situation is likely to occur in abstract algebra, where one might have to define what "division" might mean for two elements of a mathematical object such as a group, ring, or magma. One example would be an object G, such that, for two elements A and B of G, "A divided by B" is defined as an element C such that CB=A, or alternatively as an element C such that BC=A. These definitions might differ if multiplication in G is not commutative. Furthermore, if such a C is not unique, a function F(A,B) might have to be chosen to select a unique value for "A divided by B" for each A and B. Thus, the F(A,B) in the comic might not even refer to a uniquely defined operation, but simply to the property of a function F(A,B) that is a valid division operation on G, given some definition of division.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
A÷B and A⟌B both indicating schoolchild.

A/B left to software engineer.

A/B as in unicode ½ left to normal person or Unicode enthusiast.

A over B left to scientist.

AB^-1 left to fancy scientist.

F(A, B) such that (text getting smaller) next to oh no, run.

{{comic discussion}}

Talk:2684: Road Space Comparison

2022-10-13T12:22:14Z

172.70.175.146:

Hold on, I'm trying to concoct an interesting 30 goats/20 cabbages/10 wolves problem... [[User:GreatWyrmGold|GreatWyrmGold]] ([[User talk:GreatWyrmGold|talk]]) 20:53, 12 October 2022 (UTC)
S3C0ND P0ST [[Special:Contributions/172.71.150.131|172.71.150.131]] 21:12, 12 October 2022 (UTC)

You have no idea how many car-centric infrastructure arguments happen in my discord servers, this is a fantastic comic to post for that[[Special:Contributions/188.114.102.55|188.114.102.55]] 21:23, 12 October 2022 (UTC)

What if the last panel also references other river crossing puzzles like the "Missionaries and cannibals problem" or the Flash "Japanese River Crossing" puzzle so you have extra rules for each member of each species? [[Special:Contributions/172.71.98.97|172.71.98.97]] 22:11, 12 October 2022 (UTC) Alex

My name is GreyFox, and I added the transcript for this page. [[Special:Contributions/172.71.150.171|172.71.150.171]] 22:13, 12 October 2022 (UTC)

So [[1035|the takeway is]]... we can put humans in hamster balls by the handful all season and feel no worse about it than about cars driving down the road? This is awesome! [[Special:Contributions/162.158.2.215|162.158.2.215]] 22:20, 12 October 2022 (UTC)
:No, unfortunately the comic is missleading! Even though it is labelled as 50 hamsterballs the image only shows 39! [[User:Lupo|Lupo]] ([[User talk:Lupo|talk]])
::The comic never said it was one person per hamsterball. There's plenty of space in those for the hamster equivalent of a sidecar. [[User:GreatWyrmGold|GreatWyrmGold]] ([[User talk:GreatWyrmGold|talk]]) 05:30, 13 October 2022 (UTC)
:::But the image shows only one shioulette per hamsterball. I assume this picture is intentionally misleading and Randall was payd by the hamsterball-industry in order to manipulate society towards being pro hamster-ball [[User:Lupo|Lupo]] ([[User talk:Lupo|talk]])

Saw this one recently, can't be a coincidence [https://files.fietsersbond.nl/app/uploads/2011/07/18104628/enfb_ruimtegebruik.jpg NL Fietsersbond Ruimtegebruik] [[Special:Contributions/108.162.221.105|108.162.221.105]] 22:25, 12 October 2022 (UTC)

I'm a bit unsure about the linked "52 person tandem" (also, the way it is currently made a bottom-of-page reference link, which we avoid on this site). It took me a while (behind all the popups the referenced link gave me, typically) to realise the only picture of it was the miniscule thumbnail planted at the start. Which explained the anomolous wheel-count, if I understand the low-res image correctly. I would dispute Ripleys'/Guiness's acceptance of that thing as a 'tandem'. It is clearly a multi-stage {{w|Trailer bike|Rann Trailer}}-style construction (possibly with individual tandem-'trailers' in there to get the wheel count down to ''no more'' than the rider-count). Also, how on earth would a linked line of trailers actually start bursting tyres? The load of riders plus frames would spread out about as evenly as for any given single occupant bike (certainly less than the forces on the wheels of a proper tandem/trandem, or even a tandem-trike!), so I'm not sure how they even buckled a wheel. So I'd like to know what the longest two-/three-wheel tandem is (and certainly how anything like Randall's slightly snaking frame does not buckle), if anybody has their finger on that rather more relevent information, rather than that faux-tandem. [[Special:Contributions/172.71.178.137|172.71.178.137]] 03:03, 13 October 2022 (UTC)

Is it just me, or is the last block also a subtle dig at Putin's blown-up Kerch bridge? [[Special:Contributions/172.70.175.146|172.70.175.146]] 12:22, 13 October 2022 (UTC)

2682: Easy Or Hard

2022-10-07T12:45:21Z

172.70.175.146:

{{comic
| number = 2682
| date = October 7, 2022
| title = Easy Or Hard
| image = easy_or_hard_2x.png
| imagesize = 740x400px
| noexpand = true
| titletext = "Friction-driven static electrification is familiar and fundamental in daily life, industry, and technology, but its basics have long been unknown and have continually perplexed scientists from ancient Greece to the high-tech era. [...] To date, no single theory can satisfactorily explain this mysterious but fundamental phenomenon." --Eui-Cheol Shin et. al. (2022)
}}

==Explanation==
{{incomplete|Created by THE EIFFEL TOWER TAKING A TYLENOL - Do NOT delete this tag too soon.}}

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
{| class="wikitable"
|-
! !! Actually pretty easy to find out !! Very hard, but there have been recent breakthroughs !! Extremely hard, currently unsolved
|-
! Sounds borderline unsolvable
|How much does the Eiffel Tower's gravity deflect baseballs in Boston?||What time of year did the crecateous impact happen?||How can relativity be reconciled with quantum mechanics?
|-
! Sounds pretty hard, but you'd assume someone knows
|Where was Mars in the sky from Paris on the day the Eiffel Tower opened?||How many ants are there?||How does Tylenol work?
|-
! Sounds like it would be easy to look up
|How tall is the Eiffel Tower?||How does general anesthesia work?||Why does your hair get a static charge when you rub it with a balloon?
|}

{{comic discussion}}

2100: Models of the Atom

2022-10-07T12:43:11Z

172.70.175.146: /* Explanation */ complete change in tone???

{{comic
| number = 2100
| date = January 18, 2019
| title = Models of the Atom
| image = models_of_the_atom.png
| titletext = J.J. Thompson won a Nobel Prize for his work in electricity in gases, but was unfairly passed over for his "An atom is plum pudding, and plum pudding is MADE of atoms! Duuuuude." theory.
}}

==Explanation==

This comic humorously describes the changing view of what an {{w|atom}} is. This has happened so much it seems that we never really knew what we are looking at, and there have been many competing theories aside from the mainstream ones we are taught in school. He lists major depictions in the history of our understanding of an atom, and adds a few humorous ones in to poke fun at how diverse, contentious, and in retrospect often foolhardy, this history has been.

;Small hard ball model
The first model shown, in 1810, is said to be a "small hard ball model." Around this time, {{w|John Dalton}} published his textbook ''A New System of Chemical Philosophy'' which linked existing ideas of atomic theory and chemical reactivity to produce a combined {{w|law of multiple proportions}} which proposed that each chemical element is comprised of a single unique type of atom, and introduced the concept of {{w|Molecular mass|molecular weight}}. Dalton's theories form the basis of what is known today as {{w|stoichiometry}}, which underpins chemical reactivity. As atoms were considered at this time to be the smallest possible division of matter the scientific community thought of them as "hard round balls" of different sizes; thus the name described here. The "small hard ball" model is still commonly used when teaching and discussing chemical molecules which do not require the level of detail provided by more advanced models, with atoms represented as small, hard, round balls connected by sticks representing chemical bonds.

;Plum pudding model
In the late 19th and early 20th centuries, the study of these "atom" things faced a crisis: where would the newly discovered "{{w|electron}}s" go? In 1904, physicist {{w|J. J. Thomson}}, who discovered electrons, had an idea: maybe the electrons were small point charges moving around in a big mass of positive charge. This was the "{{w|plum pudding model}}", the second model on the comic, called this because people imagined the positively charged mass as a "{{w|Christmas pudding|plum pudding}}". (The title text references Thomson (although misspelled as "J.J. Thompson") as well, along with the humorous observation that plum puddings themselves are made of atoms.) The problem with this approach is that same charges generally repel, resulting in the more mobile or unbalanced charges forming a surface shell around the others, attempting to escape, rather than being content to being randomly distributed among them.

;Tiny bird model
There were many competing ideas in the formative years of what-are-atoms-made-of-ology; [[Randall]] makes up a 1907 "tiny bird model," which he suggests might have fit well in the relative chaos of the period. In this model, four birds surround the small hard ball at equal distances to one another. Two of them are singing and the other two are not and all birds are opposite to their identical bird. The non-singing birds balance the singing birds like electrons and protons. This model might be mocking the strange and sometimes illogical models that were presented for the shape of an atom.

;Rutherford model
The tentative winner in the battle was the model of Thomson's student {{w|Ernest Rutherford}}, who discovered from electrostatic scattering experiments that the positive charge seemed to be concentrated in the center of the atom, and proposed his {{w|Rutherford model}}, or "planetary model", in 1911, where electrons orbit a very concentrated positive charge. This model has often been compared to the orbit of the planets around the sun, with the electrostatic attraction of the electrons and protons shaping the orbits, rather than gravity. This is the fourth model in the comic.

;Bohr model
The Rutherford model could not explain the discrete spectral lines in absorption and emission spectra. It also did not explain why electrons did not spiral in to the nucleus. {{w|Niels Bohr}} patched the model up by proposing that electrons could only exist in distinct "energy levels" at discrete distances from the nucleus. The 1913 "{{w|Bohr model}}", the fifth model shown here, was part of beginning quantum mechanics. Physics behaves differently at the small scale of atoms than the large scales we are more familiar with.

;Nunchuck model
Randall facetiously suggests a "{{w|Nunchaku|nunchuck}} model", the sixth model shown, of a packet of protons swinging a packet of electrons around. One can imagine a handle filled with electrons bonded by the strong nuclear force to a chain made of neutrons, bonded again by the strong nuclear force to a handle made of protons. The heavier protonic handle acts loosely as an orbital center as the electron-filled opposite handle swings wildly around it, attempting to resolve its electrostatic attraction within the restraints of its chain.

;Chadwick model
The next refinement was in the structure of the nucleus. Note that at this time, nobody thought of splitting up the nucleus into {{w|proton}}s and {{w|neutron}}s. But pretty soon people noticed that protons and neutrons existed; {{w|James Chadwick}}, who discovered the neutron, figured that the atom had a nucleus of neutrons and protons, along with a bunch of electrons orbiting around it in a Bohrish manner. This is what the layman today often thinks of as an atom, and is the seventh model shown here.

;538 model
The eighth model shown is a made up "538 model," in 2008. {{w|FiveThirtyEight}} is a statistical analysis website that gained fame in 2008 for predicting every race but 2 correctly in the {{w|2008 United States presidential election|US presidential election}} and predicting every state and Obama's win in the 2012 election. Unlike most other media and polling institutes it saw a rather high probability of 29% for Trump to win the 2016 election by summing up the uncertainties in all the battle states. It has since been known for making mathematical models for everything; the model jokingly suggests that 538 has modeled and presumably made predictions about the atom. The {{w|pie chart}} shows the statistical composition of neutrons, protons and electrons, 38%, 31%, and 31% respectively. This could either be the average of a massive body with several isotopes or represent gallium-69, the most abundant {{w|Isotopes of gallium|isotope of gallium}}, with 31 protons, 31 electrons and 38 neutrons. FiveThirtyEight has previously been mentioned in several xkcd comics, including in [[477: Typewriter]], [[500: Election]], [[635: Locke and Demosthenes]], [[1130: Poll Watching]], [[1779: 2017]], and [[2002: LeBron James and Stephen Curry]]. It's appropriate to list the 538 model as a precursor to the quantum model, as it is a step towards considering the likelihood of different quantities of subatomic particles to be in different volumes of space, rather than considering them as strictly kinematic particles. The comic moves this development into 2008 in support of this joke, when it was actually made much earlier.

;Quantum model
But the Chadwick model is not what scientists endorse today.
{{w|Maxwell's equations|The theory of electromagnetism}} says that accelerated charges, like the electrons circling, would lose energy emitted as electromagnetic waves and would quickly orbit into the nucleus. Bohr only postulated that this would not happen, but his model could not explain why. Another problem{{Citation needed}} is that atoms, even the hydrogen atom are not flat - which they would be, if a single electron orbited in a circular or elliptical trajectory (the circular motion of charge results in a magnetic moment; Otto Stern and Walter Gerlach {{w|Stern–Gerlach experiment|showed}} that independent from the direction of the measurement the angular momentum - for certain elements - always has the maximum positive or negative value, i.e. not only the radius, but also the angular momentum is quantized - and never zero. You cannot 'look at' the atom from above and 'see' the orbital circle. It always 'seems', as if you 'looked' from the side and would measure the full magnetic dipole. Stern and Gerlach actually saw the spin of an electron of the silver atom instead of the angular momentum, which is according to quantum mechanics 0).
Today (i.e. actually since 1926, 29 years after the discovery of the electron) physicists subscribe to a quantum model, which is the ninth model shown here. Instead of electrons with definite location and momentum (~speed), the parts of the atom are described by probability fields of possible locations and momentums. The changes in momentum probability normally cancel each other out, so there is no electromagnetic radiation. This is very abstract, and in the last model, the model is postulated to get so abstract that it is just a "small hard ball surrounded by math" model, the last model shown. This then is remarkably similar to the model we started out from, the "small hard ball model" (without the math).

;“Small hard ball surrounded by math” model
The picture for the "small ball surrounded by math" depicts a circle with several numbers around it. While the numbers seem to symbolize the "surrounding math" in a general sense, some of them suggest constants used in actual mathematical equations or other numbers related to the quantum model. The shapes and densities of the atomic orbitals are calculated with the {{w|Schrödinger equation}}, which is complex and difficult to solve. For this reason atoms are generally precisely considered in only very simple simulations, and the details of interactions of many atoms at large scales that form our daily lives are incredibly hard to precisely understand and predict on an atomic level. It comes down to "these roundish things we call atoms are moving around in these approximate ways obeying this complex equation with too many numbers involved in most situations to accurately model, so let's use a different, empirically derived formula that describes the behavior of the system in general."

This model is probably a reference to the {{w|mathematical universe hypothesis}} and, as a striking case of [[2203: Prescience|prescience]], may be seen as a prediction of April 2020’s {{w|Stephen Wolfram#Wolfram Physics Project|Wolfram Physics Project}}.

==Transcript==
:[Heading:]
:<big>Models of the Atom</big>
:over time

:[What follows is a progression of depictions of atoms.]

:[A ball.]
:1810
:Small hard ball model

:[A 'pudding' inside of which there are electrons.]
:1904
:Plum pudding model

:[A ball, with four birds perched on it and two of them singing.]
:1907
:Tiny bird model

:[A ball with electrons orbiting chaotically, in all directions, around it.]
:1911
:Rutherford model

:[A ball with electrons circling around it.]
:1913
:Bohr model

:[A nunchuck swinging, with the left stick filled with protons and the right stick filled with electrons.]
:1928
:Nunchuck model

:[A nucleus with protons and neutrons, with electrons circling around it like the Bohr model.]
:1932
:Chadwick model

:[A pie chart. 38% is allocated to neutrons, 31% to protons, and 31% to electrons.]
:2008
:538 model

:[A nucleus with clover-like orbitals around it and surrounded by two outer partly dashed circles.]
:Today
:Quantum model

:[A ball surrounded with numbers.]
:Future
:"Small hard ball surrounded by math" model

{{comic discussion}}

[[Category:Charts]]
[[Category:Comics featuring real people]] 
[[Category:Physics]]
[[Category:Animals]] 
[[Category:Nobel Prize]]

2679: Quantified Self

2022-09-30T21:04:29Z

172.70.175.146: /* Explanation */ Added link

{{comic
| number = 2679
| date = September 30, 2022
| title = Quantified Self
| image = quantified_self_2x.png
| imagesize = 386x328px
| noexpand = true
| titletext = It's made me way more excited about ferris wheels, subways, car washes, waterslides, and store entrances that have double doors with a divider in the middle.
}}

==Explanation==
{{incomplete|Created by a PERSON STRANGLED TO DEATH WITH IMAGINARY PATH-STRING - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
Cueball (a representation of Randall in this comic) is talking about how he embraces the {{w|quantified self}}, a popular philosophy promoting tracking yourself with devices and data to help your well-being. He claims to apply this phiolosophy to his life, but he creates extremely nonsensical measurements of his fitness that create odd incentives and are unlikely to help his health.

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

[A red path links two red Cueballs. It start from the left Cueball, does two loops through a small house, under a first road bridge, under a gantry sign, under a second road bridge, under the Gateway Arch, and to a second red Cueball on the right. That Cueball is looking at a smart watch on its wrist.]

:Red Cueball's watch: Good job! You hit your weekly goal for "total length of your path through space if you minimize its length by pulling it taut, maneuvering it around solid objects but not through them."

:Below the panel: I'm into the quantified self, but only for really arbitrary quantities.

{{comic discussion}}

[[Category:Comics with color]]

649: Static

2022-09-17T22:09:39Z

172.70.175.146: /* Explanation */ update link

{{comic
| number = 649
| date = October 14, 2009
| title = Static
| image = static.png
| titletext = I firmly believe that nothing can go wrong on a project if you're wearing one of those wrist things.
}}

==Explanation==
This comic describes an unlikely confusion between a {{w|condom}} and an {{w|antistatic wrist strap}}. The two characters, presumably Cueball and Megan, are in the dark and about to engage in {{w|sexual intercourse}}. Megan checks that Cueball has a condom on. Cueball thinks a condom isn't necessary because he has an antistatic wrist strap on. Megan finds this ridiculous.

{{w|Antistatic wrist straps}} are important safety tools for {{w|electronics}} work such as handling computer parts. The wrist strap provides a conduction path directly from one's skin to an {{w|electrical ground}}, preventing the buildup of {{w|static electricity}} which, if accidentally discharged upon touching part of a circuit, can damage sensitive electronic components.

{{w|Condoms}}, on the other hand, are an important safety tool for sex, as {{w|birth control}} and protection from {{w|Sexually transmitted infection|STIs}}.

The confusion is humorous because both items have abstract similarities, but are used in wildly different kinds of activities. In an abstract sense, both are items that you want to be sure to put on before engaging in a certain activity, wearing it throughout that activity to prevent any disastrous accidental effects.

The last panel implies that in his confusion, Cueball put on a condom in order to replace the {{w|RAM}} in his computer the previous week. Rather than actually asking about it, Megan just thought that was weird. {{w|Geek Squad}} is the computer service department of the {{w|Best Buy}} chain of American electronics superstores. So Cueball also implies that he put on a condom while working in Best Buy, for performing computer repair, and so he was fired for indecency.

The title text conveys the irrational belief that nothing can go wrong on a project while wearing an antistatic wrist band. In reality, the wrist band will only protect your electronics from {{w|electrostatic discharge}}, and there are plenty of other things that could go wrong on an electronics project, such as bad soldering, installing the wrong component, mechanical damage through excessive force, or even electric shock from an exposed live voltage. Or the text could be referring to even non-electronics projects, in which case the wrist band would really be pointless.

==Transcript==
:[It's pitch black. Only Cueball and Megan's dialogue can be seen.]

:Megan: Hang on, I can't see—did you put on a condom?
:Cueball: It's okay. I've got a wrist thing on.

:Megan: A what? Let me see that.
:''fumble''
:Megan: This is an anti-static strap.

:Cueball: You mean it doesn't...
:Megan: No. Why would you even THINK that?
:Cueball: I guess I was mixed up.

:Cueball: Wait, so when I was replacing that RAM last week...
:Megan: Yeah, I THOUGHT that was weird.
:Cueball: Oh, but it explains why the Geek Squad fired me.

{{comic discussion}}
[[Category:Sex]]
[[Category:Comics with inverted brightness]]

649: Static

2022-09-17T22:08:46Z

172.70.175.146: /* Explanation */ updated language regarding STIs

{{comic
| number = 649
| date = October 14, 2009
| title = Static
| image = static.png
| titletext = I firmly believe that nothing can go wrong on a project if you're wearing one of those wrist things.
}}

==Explanation==
This comic describes an unlikely confusion between a {{w|condom}} and an {{w|antistatic wrist strap}}. The two characters, presumably Cueball and Megan, are in the dark and about to engage in {{w|sexual intercourse}}. Megan checks that Cueball has a condom on. Cueball thinks a condom isn't necessary because he has an antistatic wrist strap on. Megan finds this ridiculous.

{{w|Antistatic wrist straps}} are important safety tools for {{w|electronics}} work such as handling computer parts. The wrist strap provides a conduction path directly from one's skin to an {{w|electrical ground}}, preventing the buildup of {{w|static electricity}} which, if accidentally discharged upon touching part of a circuit, can damage sensitive electronic components.

{{w|Condoms}}, on the other hand, are an important safety tool for sex, as {{w|birth control}} and protection from {{w|STIs}}.

The confusion is humorous because both items have abstract similarities, but are used in wildly different kinds of activities. In an abstract sense, both are items that you want to be sure to put on before engaging in a certain activity, wearing it throughout that activity to prevent any disastrous accidental effects.

The last panel implies that in his confusion, Cueball put on a condom in order to replace the {{w|RAM}} in his computer the previous week. Rather than actually asking about it, Megan just thought that was weird. {{w|Geek Squad}} is the computer service department of the {{w|Best Buy}} chain of American electronics superstores. So Cueball also implies that he put on a condom while working in Best Buy, for performing computer repair, and so he was fired for indecency.

The title text conveys the irrational belief that nothing can go wrong on a project while wearing an antistatic wrist band. In reality, the wrist band will only protect your electronics from {{w|electrostatic discharge}}, and there are plenty of other things that could go wrong on an electronics project, such as bad soldering, installing the wrong component, mechanical damage through excessive force, or even electric shock from an exposed live voltage. Or the text could be referring to even non-electronics projects, in which case the wrist band would really be pointless.

==Transcript==
:[It's pitch black. Only Cueball and Megan's dialogue can be seen.]

:Megan: Hang on, I can't see—did you put on a condom?
:Cueball: It's okay. I've got a wrist thing on.

:Megan: A what? Let me see that.
:''fumble''
:Megan: This is an anti-static strap.

:Cueball: You mean it doesn't...
:Megan: No. Why would you even THINK that?
:Cueball: I guess I was mixed up.

:Cueball: Wait, so when I was replacing that RAM last week...
:Megan: Yeah, I THOUGHT that was weird.
:Cueball: Oh, but it explains why the Geek Squad fired me.

{{comic discussion}}
[[Category:Sex]]
[[Category:Comics with inverted brightness]]

2661: Age Milestone Privileges

2022-08-20T16:03:03Z

172.70.175.146:

{{comic
| number = 2661
| date = August 19, 2022
| title = Age Milestone Privileges
| image = age_milestone_privileges.png
| titletext = If you reach 122, you get complete unrevertible editorial control over Jeanne Calment's Wikipedia article.
}}

==Explanation==
{{incomplete|Created by a BABY GOD-EMPRESS MAKING THE PRESIDENT'S LETTER R-RATED - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

This is a list of "age milestones" in the United States. As usual for Randall, he has added many fictional entries to supplement some real life ones.

{| class="wikitable"
! Age || Privilege || Description
|-
| 16 || Drive || Legal driving age varies by state in the US. In Randall's state of Massachusetts, 16 is the minimum age to apply for a learner's permit.
|-
| 17 || Attend R-Rated movies Alone ||In the US, the Motion Picture Association assigns {{w|Motion_Picture_Association_film_rating_system|ratings}} to movies based on whether content in said movie is generally acceptable to present to minors. A rating of "R" is supposed to prohibit viewing by minors under 17 years of age unless a parent or guardian accompanies them.
|-
| 18 || Vote || Twenty-sixth Amendment to the United States Constitution prevents a minimum age of voting from being set above eighteen but does not preclude a minimum age below eighteen. The vast majority of states, but not all, use eighteen years as the minimum age for voting.
|-
| 21 || Buy Alcohol || In the US, the legal drinking age is 21 years, although other countries have a lower drinking age. For example, in Japan the legal age to drink is 20; whilst in the UK a person as young as 16 may have alcohol with a meal, although they are not allowed to buy it themselves.
|-
| 25 || Rent a car || Car rental companies charge higher rates for underage drivers; traditionally the minimum age is 25.
|-`e
| 30 || Run for Senate || This entry is slightly incorrect: one must be at least 30 years old in order to ''become'' Senator, not ''run'' for Senate. Joe Biden was 29 years old when he was first elected to Senate but turned 30 before being sworn in.
|-
| 32 || Rent a Senator's Car || This is the first joke entry in the table. For one thing, most Senators do not rent out their cars, which they probably need to use regularly themselves because they have jobs{{citation needed}} to commute to, and it would be a security hazard to allow random strangers access to their vehicle.
|-
| 35 || Run for president || In the US a person must be at least 35 years old to be eligible to the Office of President.
|-
| 40 || Rent a flying car ||
|-
| 45 || Learn about the god-empress || Obviously, the god-empress does not actually exist because this comic is visible to people under 45 years old.{{citation needed}}. According to [[1413]], she will be public knowledge by 2040 anyway.
|-
| 50 || Join AARP || Full AARP (formerly called the American Association of Retired Persons) membership is available to anyone age 50 and over. {{w|AARP}}
|-
| 50 || Get a shingles vaccine || At the time of the comic, the [https://www.cdc.gov/vaccines/vpd/shingles/public/shingrix/index.html CDC recommended] that adults 50 years and older get the shingles vaccine called Shingrix (this line was not in the original version of the comic, corrected later)
|-
| 52 || Click to skip captchas ||
|-
| 55 || Vote for god-empress ||
|-
| 62 || $80 national parks lifetime pass || https://www.nps.gov/planyourvisit/passes.htm
|-
| 65 || Eligible for Medicare ||
|-
| 67 || Collect Social Security [Note: U.S. individuals may collect reduced Social Security benefits at age 62.]||
|-
| 68 || See "Skip ads" button on live tv || Some DVRs and streaming applications have a feature to skip over commercial breaks in recorded programs, but this could not be available in live TV, since it would require jumping forward in time. Time travel is currently impossible.{{citation needed}} ||
|-
| 70 || Run for God-empress || The name suggests that this would also only be available to women.
|-
| 75 || Ride any animal in a national park || The National Parks Service probably could institute this relatively safely because most people over 75 would not be able to run fast enough to outrun/catch up to an animal and mount it{{citation needed}} and would not have the rebellious/risk-taking/adventurous streak that would incline them to try.{{citation needed}}
|-
| 80 || Eligible for Megacare || This is based off of becoming eligible for Medicare at age 65.
|-
| 85 || Click to toggle whether an ad is positive or negative about the product ||
|-
| 90 || Click to make any movie R-rated ||
|-
| 100 || Get a letter from the president || In the US (which other milestones, such as running for president starting at age 35, indicate is the country being referred to), you instead get congratulated by the weatherman on the {{w|Today Show}}. However, the United Kingdom is much closer. People there get a telegram from the Queen on their 100th birthday.
|-
| 102 || (35+67) Collect a presidential pension || The idea behind this joke is that it is the minimum age of presidency plus the minimal age to collect Social Security. There are several reasons why this must be a joke. Two are that Social Security begins 67 years after the person was born, not 67 years after the person's job started, and that the United States government would not bother to set up such a system because the vast majority of people, including former presidents, do not live to 102 years old. In fact, as of 2022, no former United States president has ever lived to 102 years old.
|-
| 105 || Get a birthday card from the god-empress || Being a god-empress would be more important than being the leader of a single country. This would make the god-empresses's time more valuable, so she only has to sent a birthday card to the few people who reach the age of 105.
|-
| 111 || Leave your own birthday party early by putting on a magic ring || This is a reference to the Lord of the Rings where Bilbo leaves his eleventy-first birthday party (the Bilbo Baggins Farewell Birthday Party) invisibly by using The One Ring.
|-
| 118 || Vote 100 times || Presumably a joke meaning the person can vote 100 times in each election. If there were one election at the same time each year, this would actually be the 101st vote the person is eligible to cast in their lifetime. However this milestone would happen earlier because there are often multiple elections per year, e.g., primaries, general elections, and possibly runoffs. If the sole election of each year were held at a different time of each year, someone who voted in every election might vote for the 100th time at either age 116, 117, or 118.
|-
| 120 || Collect the pensions of all elected officials ||
|-
| 125 || Drink alcohol in an R-rated movie while getting a shingles vaccine from the president || This entry references four earlier milestones (attending an R-rated movie, drinking alcohol, becoming President, and getting the shingles vaccine) whose corresponding ages (17, 21, 35, and 50) sum to 123. While not exactly 125, this may have contributed to the inspiration or age selection of this milestone.
|-
| 128 || Age rolls over, become a baby again || {{w|Integer overflow}} happens in computers when there are not enough bits (binary digits) to store the result of a calculation. For example, an unsigned 7-bit number can hold the values 0 to 127 (127 being 27 - 1). When calculating 127+1, a computer might store the value 0 instead of 128, discarding the highest bit. This is also called rollover, and usually happens in computers at powers of two, such as 128.

7-bit numbers are uncommon in today's computers. 8-bit numbers are more common. In signed 8-bit, the value 128 would become either -128 or -0 (depending upon implementation), which means you could have a weird experience of your next phase of life. For unsigned integers of one byte, the correct rollover number would be 256.

However, maybe the system uses just 7 bits (the 8th bit often used to be reserved for parity, or other flagging purposes, and otherwise stripped/ignored) if it has never before needed an eighth bit and this had once seemed like a sufficient form of data-packing with no expectation that this limit would be reached. Computers using such systems would have a Y2K-analogous bug once someone actually reached 128 years old, where anomalous processing might indicate the person to be a baby (or fail in other ways). But that would not have happened yet.

|}

The title text mentions {{w|Jeanne Calment}}, who holds the record for the oldest person ever (there are biblical references to older people, such as {{w|Methuselah}}, who supposedly lived to 969, but their ages haven't been verified). She reportedly was age 122 when the died in 1997. There's some controversy whether Calment actually claimed her mother's records, including birth certificate, as her own. "Editing wars" have been fought over her Wikipedia page. Randall claims that if you match her age you get sole editorial control over that article. However, if anyone managed to exceed her achieved age, presumably they would get their own page (albeit that they should not be encouraged to {{w|Wikipedia:Editing Your Own Page|edit it}} themselves) and hers would cease to be as interesting - although that might depend on what use is made of the unparalleled editorial control now granted.

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

<big>Age Milestones</big> 
and associated privileges

16  Drive 
17  Attend R-rated movies alone 
18  Vote 
21  Buy alcohol 
25  Rent a car 
32  Run for senate 
35  Run for president 
40  Rent a flying car 
45  Learn about the God-Empress 
50  Join AARP 
50  Get a shingles vaccine 
52  Click to skip captchas 
55  Vote for God-Empress 
62  $80 National parks lifetime pass 
65  Eligible for Medicare 
67  Collect Social Security 
68  See "Skip Ads" button on live TV 
70  Run for God-Empress 
75  Ride any animal in a national park 
80  Eligible for MegaCare 
85  Click to toggle whether any ad is positive or negative about the product 
90  Click to make any movie R-rated 
100  Get a letter from the president 
102  (35+67) Collect a presidential pension 
105  Get a birthday card from the God-Empress 
111  Leave your own birthday party early by putting on a magic ring 
118  Vote 100 times 
120  Collect the pensions of all elected officials 
125  Drink alcohol in an R-rated movie while getting a shingles vaccine from the president 
128  Age rolls over, become a baby again

{{comic discussion}}
[[Category:Politics]]
[[Category:Comics featuring real people]] 
[[Category:Wikipedia]]

2657: Complex Vowels

2022-08-11T00:11:03Z

172.70.175.146: /* Transcript */

{{comic
| number = 2657
| date = August 10, 2022
| title = Complex Vowels
| image = complex_vowels.png
| titletext = Pronouncing [ṡṡċċḣḣẇẇȧȧ] is easy; you just say it like the 'x' in 'fire'.
}}

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

[[File:Ipa-chart-vowels.png|thumb|200px|The IPA vowel chart]]

In phonetics based on the {{w|International Phonetic Alphabet}} (IPA), the space of {{w|vocal tract}} articulators determining {{w|voiced phoneme}}s such as vowels (as opposed to unvoiced consonants) is represented as two-dimensional, based on the position of the tongue. The y axis represents vowel height (i.e. how close or far the tongue is from the top of the mouth) and the x axis represents frontness/backness (i.e. how close or far the tongue is from the teeth). The position of the tongue, along with the frequency of the {{w|vocal folds}} vibrating in the larynx from air being exhaled by the diaphragm, is the primary determinant of the fundamental and second {{w|formant}}s of vowel sounds.

A third dimension of vowel sounds is the "roundedness" of the lips, and to a much lesser extent the tongue and cheeks, which is not represented on the IPA vowel chart to the right. [[Randall]] thus suggests using complex notation to indicate such a third dimension.

In mathematics, complex numbers are numbers including both real numbers and imaginary numbers. A complex number can be expressed as "''a'' + ''b''i" where ''a'' and ''b'' are real numbers, but the latter is combined with i, the imaginary part, to convey a multiple of the square root of negative one. When expanding the one-dimensional number line with an imaginary axis, it becomes two-dimensional with any 'b' component being represented perpendicularly away from the original 'real' line. Linguists never use the complex plane to represent vowel roundedness.{{cn}}

This comic conflates complex numbers in mathematics with "complex vowels" in linguistics. This creates a series of sounds which cannot be properly processed by the human brain, represented graphically as {{w|Zalgo text}} IPA. This is similar to the cliche of "black speech" in Lovecraftian horror, a language created by alien beings with different vocal patterns than humans. In reality, people find Zalgo text amusing, thus the humor of the comic, but not particularly insanity-inducing or even more than mildly confusing.

In linguistics ə is the {{w|schwa}} symbol, referred to in the title text, the most common vowel sound in English polysyllabic words (the a in comma or the second e in letter). The schwa symbol looks like a reversed e symbol (the base of natural logarithms). Production of the schwa sound takes place with the tongue, jaw, and lips all in a relaxed, central position.

The linguist in the comic appears to be {{w|Gretchen McCulloch}}, as previously depicted in [[2421: Tower of Babel]] and [[2381: The True Name of the Bear]].

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

:[A diagram shows the extrusion of the trapezoidal IPA vowel chart upwards into three dimensions. A point near the center is labeled with an equation that shows "ə + 1/2 * sqrt(-1)" as being equivalent to a made-up symbol that looks like two schwas mirroring each other with other markings above and below.]

:[Below the diagram, a character with shoulder-length dark wavy hair pronounces the new vowel in a speech bubble with unstable lines surrounding it. Two bystanders to her right are bent over slightly, clutching their heads in apparent anguish.]

:[Caption below the panel:]
:Linguistics tip: Extend the IPA vowel plane along the imaginary axis to produce ''complex vowels'', cursed sounds which the human mind cannot comprehend.

{{comic discussion}}
[[Category:Tips]]
[[Category:Language]]

2657: Complex Vowels

2022-08-11T00:09:02Z

172.70.175.146: /* Transcript */ one last formatting change i promise i'm done now

{{comic
| number = 2657
| date = August 10, 2022
| title = Complex Vowels
| image = complex_vowels.png
| titletext = Pronouncing [ṡṡċċḣḣẇẇȧȧ] is easy; you just say it like the 'x' in 'fire'.
}}

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

[[File:Ipa-chart-vowels.png|thumb|200px|The IPA vowel chart]]

In phonetics based on the {{w|International Phonetic Alphabet}} (IPA), the space of {{w|vocal tract}} articulators determining {{w|voiced phoneme}}s such as vowels (as opposed to unvoiced consonants) is represented as two-dimensional, based on the position of the tongue. The y axis represents vowel height (i.e. how close or far the tongue is from the top of the mouth) and the x axis represents frontness/backness (i.e. how close or far the tongue is from the teeth). The position of the tongue, along with the frequency of the {{w|vocal folds}} vibrating in the larynx from air being exhaled by the diaphragm, is the primary determinant of the fundamental and second {{w|formant}}s of vowel sounds.

A third dimension of vowel sounds is the "roundedness" of the lips, and to a much lesser extent the tongue and cheeks, which is not represented on the IPA vowel chart to the right. [[Randall]] thus suggests using complex notation to indicate such a third dimension.

In mathematics, complex numbers are numbers including both real numbers and imaginary numbers. A complex number can be expressed as "''a'' + ''b''i" where ''a'' and ''b'' are real numbers, but the latter is combined with i, the imaginary part, to convey a multiple of the square root of negative one. When expanding the one-dimensional number line with an imaginary axis, it becomes two-dimensional with any 'b' component being represented perpendicularly away from the original 'real' line. Linguists never use the complex plane to represent vowel roundedness.{{cn}}

This comic conflates complex numbers in mathematics with "complex vowels" in linguistics. This creates a series of sounds which cannot be properly processed by the human brain, represented graphically as {{w|Zalgo text}} IPA. This is similar to the cliche of "black speech" in Lovecraftian horror, a language created by alien beings with different vocal patterns than humans. In reality, people find Zalgo text amusing, thus the humor of the comic, but not particularly insanity-inducing or even more than mildly confusing.

In linguistics ə is the {{w|schwa}} symbol, referred to in the title text, the most common vowel sound in English polysyllabic words (the a in comma or the second e in letter). The schwa symbol looks like a reversed e symbol (the base of natural logarithms). Production of the schwa sound takes place with the tongue, jaw, and lips all in a relaxed, central position.

The linguist in the comic appears to be {{w|Gretchen McCulloch}}, as previously depicted in [[2421: Tower of Babel]] and [[2381: The True Name of the Bear]].

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

[A diagram shows the extrusion of the trapezoidal IPA vowel chart upwards into three dimensions. A point near the center is labeled with an equation that shows "ə + 1/2 * sqrt(-1)" as being equivalent to a made-up symbol that looks like two schwas mirroring each other with other markings above and below.]

[Below the diagram, a character with shoulder-length dark wavy hair pronounces the new vowel in a speech bubble with unstable lines surrounding it. Two bystanders to her right are bent over slightly, clutching their heads in apparent anguish.]

[Caption below the panel:]
:Linguistics tip: Extend the IPA vowel plane along the imaginary axis to produce ''complex vowels'', cursed sounds which the human mind cannot comprehend.

{{comic discussion}}
[[Category:Tips]]
[[Category:Language]]

2657: Complex Vowels

2022-08-11T00:06:45Z

172.70.175.146: /* Transcript */ formatting changes. I hope that's right now.

{{comic
| number = 2657
| date = August 10, 2022
| title = Complex Vowels
| image = complex_vowels.png
| titletext = Pronouncing [ṡṡċċḣḣẇẇȧȧ] is easy; you just say it like the 'x' in 'fire'.
}}

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

[[File:Ipa-chart-vowels.png|thumb|200px|The IPA vowel chart]]

In phonetics based on the {{w|International Phonetic Alphabet}} (IPA), the space of {{w|vocal tract}} articulators determining {{w|voiced phoneme}}s such as vowels (as opposed to unvoiced consonants) is represented as two-dimensional, based on the position of the tongue. The y axis represents vowel height (i.e. how close or far the tongue is from the top of the mouth) and the x axis represents frontness/backness (i.e. how close or far the tongue is from the teeth). The position of the tongue, along with the frequency of the {{w|vocal folds}} vibrating in the larynx from air being exhaled by the diaphragm, is the primary determinant of the fundamental and second {{w|formant}}s of vowel sounds.

A third dimension of vowel sounds is the "roundedness" of the lips, and to a much lesser extent the tongue and cheeks, which is not represented on the IPA vowel chart to the right. [[Randall]] thus suggests using complex notation to indicate such a third dimension.

In mathematics, complex numbers are numbers including both real numbers and imaginary numbers. A complex number can be expressed as "''a'' + ''b''i" where ''a'' and ''b'' are real numbers, but the latter is combined with i, the imaginary part, to convey a multiple of the square root of negative one. When expanding the one-dimensional number line with an imaginary axis, it becomes two-dimensional with any 'b' component being represented perpendicularly away from the original 'real' line. Linguists never use the complex plane to represent vowel roundedness.{{cn}}

This comic conflates complex numbers in mathematics with "complex vowels" in linguistics. This creates a series of sounds which cannot be properly processed by the human brain, represented graphically as {{w|Zalgo text}} IPA. This is similar to the cliche of "black speech" in Lovecraftian horror, a language created by alien beings with different vocal patterns than humans. In reality, people find Zalgo text amusing, thus the humor of the comic, but not particularly insanity-inducing or even more than mildly confusing.

In linguistics ə is the {{w|schwa}} symbol, referred to in the title text, the most common vowel sound in English polysyllabic words (the a in comma or the second e in letter). The schwa symbol looks like a reversed e symbol (the base of natural logarithms). Production of the schwa sound takes place with the tongue, jaw, and lips all in a relaxed, central position.

The linguist in the comic appears to be {{w|Gretchen McCulloch}}, as previously depicted in [[2421: Tower of Babel]] and [[2381: The True Name of the Bear]].

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

[A diagram shows the extrusion of the trapezoidal IPA vowel chart upwards into three dimensions. A point near the center is labeled with an equation that shows "ə + 1/2 * sqrt(-1)" as being equivalent to a made-up symbol that looks like two schwas mirroring each other with other markings above and below.]

[Below the diagram, a character with shoulder-length dark wavy hair pronounces the new vowel in a speech bubble with unstable lines surrounding it. Two bystanders to her right are bent over slightly, clutching their heads in apparent anguish.]

[Caption below the panel:]
Linguistics tip: Extend the IPA vowel plane along the imaginary axis to produce ''complex vowels'', cursed sounds which the human mind cannot comprehend.

{{comic discussion}}
[[Category:Tips]]
[[Category:Language]]

2657: Complex Vowels

2022-08-11T00:01:28Z

172.70.175.146: filling out the transcript with more details

{{comic
| number = 2657
| date = August 10, 2022
| title = Complex Vowels
| image = complex_vowels.png
| titletext = Pronouncing [ṡṡċċḣḣẇẇȧȧ] is easy; you just say it like the 'x' in 'fire'.
}}

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

[[File:Ipa-chart-vowels.png|thumb|200px|The IPA vowel chart]]

In phonetics based on the {{w|International Phonetic Alphabet}}, the space of {{w|vocal tract}} {{w|articulators}} determining {{w|voiced phoneme}}s such as vowels (as opposed to unvoiced consonants) is represented as two-dimensional, based on the position of the tongue. The y axis represents vowel height (i.e. how close or far the tongue is from the top of the mouth) and the x axis represents frontness/backness (i.e. how close or far the tongue is from the teeth). The position of the tongue is the primary determinant of the fundamental and second {{w|formant}}s of vowel sounds. In an analogy to the addition of a new dimension in mathematics, two-dimensional vowelspace becomes '''three'''-dimensional with a new axis. A third dimension of vowel sounds is the "roundedness" of the lips, and to a much lesser extent the tongue and cheeks, which is not represented on the IPA vowel chart to the right. [[Randall]] thus suggests using complex notation to indicate such a third dimension.

In mathematics, complex numbers are numbers including both real numbers and imaginary numbers. A complex number can be expressed as "''a'' + ''b''i" where ''a'' and ''b'' are real numbers, but the latter is combined with i, the imaginary part, to convey a multiple of the square root of negative one. When expanding the one-dimensional number line with an imaginary axis, it becomes two-dimensional with any 'b' component being represented perpendicularly away from the original 'real' line. Linguists never use the complex plane to represent vowel roundedness.{{cn}}

This comic conflates complex numbers in mathematics with "complex vowels" in linguistics. This creates a series of sounds which cannot be properly processed by the human brain. This is similar to the cliche of "black speech" in Lovecraftian horror, a language created by alien beings with different vocal patterns than humans.

In linguistics ə is the schwa symbol, referred to in the title text, the most common vowel sound in English polysyllabic words (the a in comma or the second e in letter). The schwa symbol looks like a reversed e symbol (the base of natural logarithms). Production of the schwa sound takes place with the tongue, jaw, and lips all in a relaxed, central position.

The linguist in the comic appears to be {{w|Gretchen McCulloch}}, as previously depicted in [[2421: Tower of Babel]] and [[2381: The True Name of the Bear]].

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

A diagram shows the extrusion of the trapezoidal IPA vowel chart upwards into three dimensions. A point near the center is labeled with an equation that shows "ə + 1/2 * sqrt(-1)" as being equivalent to a made-up symbol that looks like two schwas mirroring each other with other markings above and below.

Below the diagram, a character with shoulder-length dark wavy hair pronounces the new vowel in a speech bubble with unstable lines surrounding it. Two bystanders are bent over slightly, clutching their heads in apparent anguish.

A caption below the panel reads: "Linguistics tip: Extend the IPA vowel plane along the imaginary axis to produce ''complex vowels'', cursed sounds which the human mind cannot comprehend."

{{comic discussion}}
[[Category:Tips]]
[[Category:Language]]

2652: Proxy Variable

2022-07-30T02:47:52Z

172.70.175.146: Undo revision 291159 by 172.71.142.89 (talk)

{{comic
| number = 2652
| date = July 29, 2022
| title = Proxy Variable
| image = proxy_variable.png
| titletext = Our work has produced great answers. Now someone just needs to figure out which questions they go with.
}}

==Explanation==
{{incomplete|Created by a PROXY BOT IN NO WAY CORRELATED WITH THE ORIGINAL BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

some spam going on here

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

{{comic discussion}}

Talk:936: Password Strength

2022-06-27T14:51:17Z

172.70.175.146: T mobile is using this password scheme

''Fix the software first.'' If you double the time it takes to enter each repeated password attempt you make brute force attacks pointless. Imagine you allowed a hurried user who screws up their own password entry w/ frozen fingers. If their system starts out with a 1 second delay, then doubles to two, then to four, etc. the time it takes to wait is 2^n. Six screw ups cost you a minute, twenty errors and you are waiting 291 hours before your next log-in attempt.... kmc 2015-05-10 {{unsigned ip|108.162.229.124}}

: That's not how brute force attacks work. They steal the hashes of the passwords and then brute force them locally. [[Special:Contributions/198.41.235.107|198.41.235.107]] 23:43, 10 January 2016 (UTC)
:: Both are brute force. It is specified in the comic that we assume an attack against a weak remote web service though. --[[Special:Contributions/162.158.150.231|162.158.150.231]] 13:10, 16 September 2016 (UTC)

You still have to vary the words with a bit of capitalization, punctuation and numbers a bit, or hackers can just run a dictionary attack against your string of four words. '''[[User:Davidy22|{{Color|purple|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 09:12, 9 March 2013 (UTC)
: Several discussions around the internet around this -- the consensus [ http://www.explainxkcd.com/wiki/index.php/936 looks like] that once this scheme is published it is fairly simple to run a dictionary attack on the password. My advise to most people is to use a password manager like lastpass or onepass that can generate pure random password. [[Special:Contributions/162.158.253.6|162.158.253.6]] 23:52, 10 March 2016 (UTC)

No you don't. Hackers cannot run a dictionary attack against a string of four randomly picked words.
Look at the number of bits displayed in the image: 11 bits for each word.
That means he's assuming a dictionary of 2048 words, from which each word is picked randomly.
The assumption is that the cracker knows your password scheme.
[[Special:Contributions/86.81.151.19|86.81.151.19]] 20:17, 28 April 2013 (UTC)
Willem

:I just wrote a program to bruteforce this password creation method. https://github.com/KrasnayaSecurity/xkcd936/blob/master/listGen936.py Once I get it I'll try coming up with more bruteforcing algorithms such as substituting symbols, numbers, camel case, and the like. Point is, don't rely on this or any one method. I wouldn't be surprised if the crackers are already working on something like this. [[User:Lieutenant S.|Lieutenant S.]] ([[User talk:Lieutenant S.|talk]]) 07:03, 8 September 2014 (UTC)
:It took 1.25 hours to bruteforce "correcthorsebatterystaple" using the 2,000 most common words with one CPU. [[User:Lieutenant S.|Lieutenant S.]] ([[User talk:Lieutenant S.|talk]]) 07:09, 9 September 2014 (UTC)
:: 1) ... as compared to 69 milliseconds for the other method. 2) Since you are able to test 3,9 billion passwords as second (very impressive!) I am guessing that your setup is not performing its attack over a ”weak remote service”, which is breaking the rules of the #936 game. 3) five words and a 20k-wordlist would get you 9400 years (still breaking the weak remote service rule).--[[User:Gnirre|Gnirre]] ([[User talk:Gnirre|talk]]) 09:13, 14 October 2014 (UTC)
:: 2) Two thoughts: You use itertools.permutations, which only covers non-repeating words, but mainly you don't actually hash the password. If you have a plain-text password, there no need to crack the password because you could just look at it. Example of an actual crack for this type of password: https://github.com/koshippy/xkcd_password/blob/master/password_crack.py My computer gets 10,000,000 guesses in ~16 seconds (non-hashed takes ~2 seconds), meaning it would take almost a year to try every combination. (2048^4 total password space). Even optimizing by using c++/java or JtR, you wouldn't see huge improvement since most of the time is from the SHA hashing. Point being: a typical user can't crack this type of password in a short amount of time, even if they know your wordlist. [[Special:Contributions/199.27.128.212|199.27.128.212]] 12:05, 17 February 2015 (UTC) Koshippy

Sometimes this is not possible. (I'm looking at you, local banks with 8-12 character passwords and PayPal) If I can, I use a full sentence. A compound sentence for the important stuff. This adds the capitalization, punctuation and possibly the use of numbers while it's even easier to remember then Randall's scheme. I think it might help against the keyloggers too, if your browser/application autofills the username filed, because you password doesn't stand out from the feed with being gibberish. [[Special:Contributions/195.56.58.169|195.56.58.169]] 09:01, 30 August 2013 (UTC)

The basic concept can be adapted to limited-length passwords easily enough: memorize a phrase and use the first letter of each word. It'll require about a dozen words (you're only getting 4.7 bits per letter at best, actually less because first letters of words are not truly random, though they are weakly if at all correlated with their neighbors -- based on the frequencies of first letters of words in English, and assuming no correlation between each first letter and the next, I calculate about 4 bits per character of Shannon entropy). SteveMB 18:35, 30 August 2013 (UTC)

Followup: The results of extracting the first letters of words in sample texts (the {{w|Project_Gutenberg|Project Gutenberg}} texts of ''The Adventures of Huckleberry Finn'', ''The War of the Worlds'', and ''Little Fuzzy'') and applying a {{w|Entropy_(information_theory)|Shannon entropy calculation}} were 4.07 bits per letter (i.e. first letter in word) and 8.08 bits per digraph (i.e. first letters in two consecutive words). These results suggest that first-letter-of-phrase passwords have approximately 4 bits per letter of entropy. --[[User:SteveMB|SteveMB]] ([[User talk:SteveMB|talk]]) 14:21, 4 September 2013 (UTC)

Addendum: The above test was case-insensitive (all letters converted to lowercase before feeding them to the [[http://millikeys.sourceforge.net/freqanalysis.html frequency counter]]). Thus, true-random use of uppercase and lowercase would have 5 bits per letter of entropy, and any variation in case (e.g. preserving the case of the original first letter) would fall between 4 and 5 bits per letter. --[[User:SteveMB|SteveMB]] ([[User talk:SteveMB|talk]]) 14:28, 4 September 2013 (UTC)

I just have RANDOM.ORG print me ten pages of 8-character passwords and tape it to the wall, then highlight some of them and use others (say two down and to the right or similar) for my passwords, maybe a given line a line a little jumbled for more security. [[Special:Contributions/70.24.167.3|70.24.167.3]] 13:27, 30 September 2013 (UTC)
:Remind me to visit your office and secretly replace your wall-lists by a list of very similar looking strings ;) --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 13:53, 30 September 2013 (UTC)

Simple.com (online banking site) had the following on it’s registration page:

“Passphrase? Yes. Passphrases are easier to remember and more secure than traditional passwords. For example, try a group of words with spaces in between, or a sentence you know you'll remember. "correct horse battery staple" is a better passphrase than r0b0tz26.”

Online security for a banking site has been informed by an online comic. Astounding.
[[Special:Contributions/173.245.54.78|173.245.54.78]] 21:22, 11 November 2013 (UTC)

The Web service Dropbox has an Easter egg related to this comic on their sign-up page. That page has a password strength indicator (powered by JavaScript) which changes as you type your password. This indicator also shows hints when hovering the mouse cursor over it. Entering "Tr0ub4dor&3" or "Tr0ub4dour&3" as the password causes the password strength indicator to fall to zero, with the hint saying, "Guess again." Entering "correcthorsebatterystaple" as the password also causes the strength indicator to fall to zero, but the hint says, "Whoa there, don't take advice from a webcomic too literally ;)." [[Special:Contributions/108.162.218.95|108.162.218.95]] 15:17, 11 February 2014 (UTC)

The explanation said that the comic uses a dictionary[http://www.explainxkcd.com/wiki/index.php?title=936:_Password_Strength&oldid=59309]. In fact it's a word list, which seems similar but it's not. All the words in the word list must be easy to memorize. This means it's better not to have words such as ''than'' or ''if''. Also, it's better not to have homophones (''wood'' and ''would'', for example). The sentence ''dictionary attack'' doesn't apply here. A dictionary attack requires the attacker to use all the words in the dictionary (e.g. 100,000 words). Here we must generate the 17,592,186,044,416 combinations of 4 common words. Those combinations can't be found in any dictionary. At 25 bytes per "word" that dictionary would need 400 {{w|tebi|binary terabytes}} to be stored. [[User:Xhfz|Xhfz]] ([[User talk:Xhfz|talk]]) 21:37, 11 March 2014 (UTC)

This comic was mentioned in a TED talk by Lorrie Faith Cranor on in March 2014. After performing a lot of studies and analysis, she concludes that "pass phrase" passwords are no easier to remember than complex passwords and that the increased length of the password increases the number of errors when typing it. There is a lot of other useful information from her studies that can be gleaned from the talk. [http://www.ted.com/talks/lorrie_faith_cranor_what_s_wrong_with_your_pa_w0rd Link]. What she doesn't mention is the frequency of changing passwords - in most organizations it's ~90 days. I don't know where that standard originated, but (as a sys admin) I suspect it's about as ineffective as most of our other password trickery - that is that it does nothing. Today's password thieves don't bash stolen password hash tables, they bundle keyloggers with game trainers and browser plugins.--[[Special:Contributions/173.245.50.75|173.245.50.75]] 18:14, 2 July 2014 (UTC)
:: Lorrie Faith Cranor gets the random part of #936 word generation correct, which is great. Regarding memorizability, this study (https://cups.cs.cmu.edu/soups/2012/proceedings/a7_Shay.pdf) does not address #936. The study uses no generator for gibberish of length 11. Most comparable are perhaps two classes of five or six randomly assigned characters. None of the study's generators has 44 bits of entropy – its dictionary for the method closest to #936 – noun-instr – contains only 181 nouns. The article contains no discussion of the significance of these differences to #936. In her TED Lorrie Faith Cranor says ”sorry all you xkcd fans” which could be interpreted as judgement of #936, but there is no basis in the above article for that. It does however seem plausible that the report could be reworked to address #936. --[[User:Gnirre|Gnirre]] ([[User talk:Gnirre|talk]]) 10:42, 14 October 2014 (UTC)

:Password-changing frequency isn't about making passwords more ''secure'', but instead it's about ''mitigating the damage'' of a successfully cracked password. If a hacker gets your password (through any means) and your password changes every 90 days, the password the hacker has obtained is only useful for a few months at most. That might be enough, but it might not. If the hacker is brute forcing the passwords to get them, that cuts into the time the password is useful. --[[Special:Contributions/173.245.54.168|173.245.54.168]] 22:22, 13 October 2014 (UTC)
::However, brute-forcing gets much ''easier'' that way.
::Say the average employee is around for 10 years, which is reasonable for some companies , absurdly high for others, and a bit low for a family business. That's 40 password changes.
::Now if you have to remember another password every now and then, you sacrifice complexity, lest you forget it. A factor of 40 is like one character less. But how much shorter will the password be? It's more likely that it's gonna be 3 or 4 characters less. Congrats, you just a factor of 1000's for a perceived "mitigation", which doesn't even work. Pro attackers can vacuum your server in a DAY once they have the PW. [[Special:Contributions/141.101.104.53|141.101.104.53]] 13:03, 4 December 2014 (UTC)

Just because you are required to have a password that has letters and numbers in it doesn't mean you can't make it memorable. When caps are required, use CamelCase. When punctuation is required, make it an ampersand (&) or include a contraction. When numbers are required, pick something that has significance to you (your birthday, the resolution of your television, ect.). Keep in mind that, if your phrase is an actual sentence, the password entropy is 1.1 bits per character (http://what-if.xkcd.com/34), so length is key if you want your password to be secure. (Though no known algorithm can actually exploit the 1.1 bits of entropy to gain time, so it might be more like 11 bits of entropy per word. Even then, my passwords have nonexistent and uncommon words in them, (like doge or trope), which also adds some entropy.) [[Special:Contributions/108.162.246.213|108.162.246.213]] 22:18, 1 September 2014 (UTC)
:Flip side of the story, the "capital plus small plus other char" policy doesn't make your password any safer.
:The German company T-online had an experimental gateway with the password, "internet". Now that sucked. No problem, tho, because that gateway wasn't accessible from outside. When they went live, they "improved" the password to "Internet1". There are still lots of these passwords around: first letter is a Cap, and the only non-alphabetic char is a 1 at the end. This doesn't add any entropy. [[Special:Contributions/141.101.104.53|141.101.104.53]] 13:03, 4 December 2014 (UTC)
::[http://ask.metafilter.com/193052/Oh-Randall-you-do-confound-me-so#2779020 This] shows that about one third of all digits in a sample of passwords was "1" . [[Special:Contributions/141.101.104.53|141.101.104.53]] 13:14, 4 December 2014 (UTC)
You can also troll the brute-force engine by using words from other languages, fictional books and video games.--[[User:Horsebattery|Horsebattery]] ([[User talk:Horsebattery|talk]]) 03:04, 3 November 2014 (UTC)
:That's a good idea; it adds to the entropy bits per word. If you really want to throw them off, mix different languages. Just don't use very well-known words; I'm sure the hackers have ''cojones'' and ''Blitzkrieg'' in their dictionaries. [[Special:Contributions/141.101.104.53|141.101.104.53]] 13:03, 4 December 2014 (UTC)

Also, passwords that are 'hard to remember' are themselves a security vulnerability. A password reset scheme (or even a lockout scheme) is a vulnerability. The more it needs to be used, the harder it becomes to police that vulnerability. Relatedly, hard-to-remember passwords leave users uncertain whether their password has been changed by someone else or they've just forgotten it. [[User:Ijkcomputer|Ijkcomputer]] ([[User talk:Ijkcomputer|talk]]) 15:32, 18 December 2014 (UTC)

Hi there, this comic gave me the idea for a password generator that can (optionally) use dictionary words. Have a look if you're interested: https://wordypasswords.com Use your common sense though about what is and isn't secure! Hope someone finds it useful. [[User:Mackatronic|Mackatronic]] ([[User talk:Mackatronic|talk]]) 08:23, 9 January 2015 (UTC)

I have not read all of the replies and in truth most of the detail is boring to me but it has occurred to me that with this sort of problem and since the Snowden affair, serious security devices will have to make the keyboard redundant.

At the moment all I can imagine is a series of pictures like hieroglyphs but even using a rolling code of ever changing font glyphs would do. When the security required by money minders reaches the stage of development possible with keyboards that can supply that sort of security, we will have some idea which banks have some idea about security.

Tip:
Not Barings. They have an history of intransigence and stupidity. (Still revered in banks though as able to cure colon cancer with poor investment strategies.)

[[User:Weatherlawyer| I used Google News BEFORE it was clickbait]] ([[User talk:Weatherlawyer|talk]]) 13:46, 23 January 2015 (UTC)

The D0g..................... (24 characters long) is NOT stronger than PrXyc.N(n4k77#L!eVdAfp9 (23 characters long). The reason why, is that the later password is random. There is no pattern. The former, "padding" technique can be very easily cracked. You just need to assume that each character be repeated 1~30 times. Then the first password would become : 1(D)1(0)1(g)21(.), which, is then of complexity 30^4 + 96^4, versus 96^23 for the random password. And that is assuming that any character can be repeated 1~30 times, so DDDDDDDDD0000000ggggggg...... also would be cracked extremely quickly. If you limit yourself to only last character padding, your password now becomes 30*96^4 possibilities. {{unsigned ip|108.162.222.235}}

And that's why it is stupid to explain this kind of joke : it depends on many (MANY) parameters such as brute-force method and encryption/hash algorithm. Giving this kind of (wrong) explanations about "pass cracking" (as if it was always the same way to process ...) is ridiculous. And they talk about entropy .......... Holy shit, go back to school and stop screwing cryptography up. zM_

I just use a password with a ␡ character or two, and ␇ for banks. [[Special:Contributions/108.162.242.21|108.162.242.21]] 08:33, 18 August 2015 (UTC)

I'am astonished that even someone like Schneier don't get 936 right immediately after reading it. So, I think I know what was going on in Munroes mind conceptually. Maybe there are some grans of salt, but I don't have a problem with these. But I do have one (or two) quantitative problem(s) with 936:
* I was not able to find out, how Munroe get the value of about 16 bits of entropy for the "uncommon" nine letter lower case "non-gibberish base word". This would mean: On average, a letter of such a word will have about 1.8 bits of entropy. May be, but how do we know? "Citation needed!" ;-)
* (Secondly: The "punctuation" should have 5, not 4 bits of entropy. There are 32 (2^5) ASCII punctuation characters (POSIX class [:punct:]). But I assume this is a lapse.)
Can someone enlighten me? --[[Special:Contributions/162.158.91.236|162.158.91.236]] 17:31, 19 September 2015 (UTC)
:I have missed the sentence "Randall assumes only the 16 most common characters are used in practice (4 bits)". Hm. There is a huge list with real world passwords out there, leaking from RockYou in 2009. After some processing to remove passwords containing characters that are not printable ASCII characters (ñ, £, ๅ, NBSP, EOT, ...), the list contains about 14329849 unique passwords from about 32585010 accounts (there are some garbage "passwords" like HTML code fragments). The following are the number of accounts using a password containing a particular printable character (one or more tokens of a particular type):
<nowiki>
226673 .
186883 _
179264 !
125846 -
104224 @
95237 *
92802 (space)
60002 #
36522 /
31172 $
28550 &
27686 ,
23905 +
18704 =
18268 )
17927 ?
16401 (
16074 '
14407 ;
11819 <
11118 %
10723 ]
8975 \
7718 [
7209 :
5815 ~
5673 ^
4995 `
2847 "
2741 >
1050 {
939 }
502 |

(NB: 1222815 accounts were using a password containing at least one of these.)
</nowiki>
:Sorry, I have no "citation". But you can play with the leaked RockYou password list yourself. Here is a way to reach that playground:
<nowiki>
$ # Download the compressed list (57 MiB; I have no idea what "skullsecurity"
$ # is, it was simply the first find and I assume it's the said list):
$ wget http://downloads.skullsecurity.org/passwords/rockyou-withcount.txt.bz2

$ # Decompress the list (243 MiB), or, to speak more exact, it's a table:
$ bzip2 -dk rockyou-withcount.txt.bz2

$ # The content of the table is: "How many accounts (first row) were using that
$ # password (second row)?" Let's take a peek:
$ head -n5 rockyou-withcount.txt
290729 123456
79076 12345
76789 123456789
59462 password
49952 iloveyou

$ # The following command processes the table to remove lines with passwords
$ # containing characters that are not printable ASCII characters (14541
$ # lines/passwords, 18038 accounts), and lines insisting that there were some
$ # accounts with no password (1 line, 340 accounts). Moreover, the command
$ # removes every space character not belonging to a password, makes the rows
$ # tab-delimited and writes the result in a file called "ry" (161 MiB; many
$ # bloating spaces removed).
$ LC_ALL=C sed -n 's/^ *$[1-9][0-9]*$ $[[:print:]]\{1,\}$$/\1\t\2/p' rockyou-withcount.txt >ry

$ # The following are shell functions to build commands. They will be explained
$ # below using examples (I can not express myself well in this language).
$ counta() { LC_ALL=C awk 'BEGIN { FS = "\t"; p = 0; a = 0 } { if ($2 ~ /'"$(printf %s "$1" | sed 'sI/I\\/Ig')"'/) { p++; a += $1 } } END { print a " (" p ")" }' "$2" ;}
$ countap() { LC_ALL=C awk 'BEGIN { FS = "\t"; p = 0; a = 0 } { if ($2 ~ /'"$(printf %s "$1" | sed 'sI/I\\/Ig')"'/) { p++; a += $1; print $0 } } END { print a " (" p ")" }' "$2" ;}

$ # We have reached the playground. Here are some examples for how to use the
$ # toys:

$ # Count how many accounts were using a password containing the string love:
$ counta 'love' ry
671599 (188855)

$ # The first operand of the above command is a extended regular expression
$ # (ERE). The second operand is a file, namely the previously generated file
$ # called "ry", that is the (processed) table. The first number of the output
$ # means: "That many accounts were using a password matching the ERE." The
$ # second number inside parentheses means: "That many unique passwords matching
$ # the ERE." If the first number is greater than the second number, some
$ # accounts sharing the same password (we will see this clearly in one of the
$ # examples below).

$ # Count how many accounts were using a password containing at least one
$ # character:
$ counta '.' ry
32585010 (14329849)

$ # Count how many accounts were using a password containing exactly one
$ # character:
$ counta '^.$' ry
144 (45)

$ # Count how many accounts were using a password containing exactly one numeric
$ # character:
$ counta '^[0-9]$' ry
55 (10)

$ # Let's have a look at the distribution:
$ countap '^[0-9]$' ry
29 1
6 7
6 3
3 9
3 2
2 6
2 5
2 0
1 8
1 4
55 (10)

$ # Obove we see the second command at work. You see what it does and what it
$ # does different. And here we see clearly the meaning of the first number and
$ # the second number inside parentheses.

$ # Count how many accounts were using a password containing at least one
$ # numeric character:
$ counta '[0-9]' ry
17609065 (9761364)

$ # Count how many accounts were using a password ending with a numeric
$ # character:
$ counta '[0-9]$' ry
15728238 (8313698)

$ # Count how many accounts were using a password beginning with a numeric
$ # character:
$ counta '^[0-9]' ry
6409397 (3283946)

$ # Count how many accounts were using a password containing only numeric
$ # characters:
$ counta '^[0-9]+$' ry
5192990 (2346744)

$ # And, last but not least, count how many accounts were using a password
$ # containing that "uncommon non-gibberish base word" in 936, with an upper
$ # or an lower case first letter, with or without some of the "common
$ # substitutions":
$ counta '[tT]r[o0]ub[a4]d[o0]r' ry
3 (3)

$ # Yes, there are some. 14 million unique passwords are a lot. Let's see what
$ # exactly was used:
$ countap '[tT]r[o0]ub[a4]d[o0]r' ry
1 troubador1
1 troubador
1 darktroubador
3 (3)
</nowiki>
:[[Special:Contributions/162.158.91.236|162.158.91.236]] 06:23, 21 September 2015 (UTC)

Interesting read about the generated password streangth: https://www.schneier.com/blog/archives/2016/01/friday_squid_bl_508.html#c6714590 [[Special:Contributions/162.158.91.190|162.158.91.190]] 08:09, 8 January 2016 (UTC)

: That person sounds confused. [[Special:Contributions/198.41.235.107|198.41.235.107]] 23:43, 10 January 2016 (UTC)

;You've Already Memorized It

Originally I logged in to report a local xkcd related phenomenon, and ask if anyone else had experienced it. The destiny, seemingly inescapable, that at once became my own upon seeing that last panel; the effect of the self-fullfilling combination of the very specific look of inquiry -- one I recognize immediately and associate with the words ''"interesting, Captain"'' -- and the insidiously performative ''"You've already memorized it."'' At first I doubted this was actually the case, but soon I could no longer, since not only did the phrase readily come to the mind and out the mouth, it also came up often. The ''"correct"'' soon replaced the word ''"right"'' in everyday conversation, then ''"right you are"'' and ''"yes"'' and so forth, then its opposite (with a ''"no"'' in front), then replacing the direction, the verb involving pen and paper (the most recent development was merely a quick under the breath aside of an acronym of the remaining words). All followed by the rest of the absurdly perfect password. '''Now here's the kicker: I logged on to tell you all this for some reason, only to find, I had memorized ''"correct horse staple battery"'' instead of ''"correct horse battery staple."'''''[[User:A female faust|A female faust]] ([[User talk:A female faust|talk]]) 03:58, 31 July 2016 (UTC)

:If you go to https://howsecureismypassword.net/ and type in the suggested password in the comic, it says that the password would be cracked instantly, and adds a section titled "xkcd".
[[Special:Contributions/162.158.62.195|162.158.62.195]] 14:18, 11 February 2017 (UTC)

Would you believe it, the guy who made the bad password rules switched his philosophy to this comic's: "Long, easy-to-remember phrases now get the nod over crazy characters" "In a widely circulated piece, cartoonist [[Randall Munroe]] calculated it would take 550 years to crack the password “correct horse battery staple,” all written as one word. The password Tr0ub4dor&3—a typical example of a password using Mr. Burr’s old rules—could be cracked in three days" [[User:Jacky720|That's right, Jacky720 just signed this]] ([[User talk:Jacky720|talk]] | [[Special:Contributions/Jacky720|contribs]]) 11:57, 8 August 2017 (UTC)

The 44 bits of entropy breaks down rapidly when you realize in real life, most people will choose a passphrase that contains words like "pass", "phrase", "remember", "long", "company" and quite likely "stupid". It's the passphrase equivalent of "password123". If the words are selected randomly and then assigned to a person, that would fix that problem (but create others, like mistrust of a computer that assigns passwords for you to log into that same computer with). [[User:Nerfer|Nerfer]] ([[User talk:Nerfer|talk]]) 21:19, 11 October 2019 (UTC)

There is one aspect which has been left out the whole time. I do not question things like wordlist length, entropy, or substitutions. However, doing shoulder surfing will either reveal a full password or in parts. A full password should not be topic of discussion. In the case of partial success, it is in the proposed method far easier to guess the rest of the password than in the traditional one. [[User:CommingFromTheSide|CommingFromTheSide]] ([[User talk:CommingFromTheSide|talk]]) 15:16, 5 November 2019 (UTC)

As for "author's 28 bits mistake". I believe that Randall does mean the common lexicon with mangling substitutions. That means that counterexample "J4I/tyJ&Acy" does have 72bits, but nonetheless is irrelevant to character/personage strategy of choosing a memorable yet strong password. [[Special:Contributions/172.68.215.113|172.68.215.113]] 13:17, 23 February 2020 (UTC)

Ah... this reminds me of one of my old password.

> It had quote.

> It had comments.

> There were "10e9 characters". (Don't worry, as much as it length backfired, if you types fast, you could type by hand in less than 5 minutes)

> It had typo.

> It had hints of itself in itself.

--[[Special:Contributions/172.68.154.70|172.68.154.70]] 08:22, 8 April 2020 (UTC)

Ah yes, now Microsoft has disabled plaintext words in passwords. I can see where they were trying to go with this but it completely backfired for everyone who doesn't use the password "password". -[[User:Alpha2|Alpha2]] ([[User talk:Alpha2|talk]]) 15:20, 13 October 2021 (UTC)

--[[Special:Contributions/172.70.175.146|172.70.175.146]] 14:51, 27 June 2022 (UTC)

This scheme (four words) was used for the default wifi and admin passwords on a T Mobile wireless home internet gateway received on 2022-Jun-23

Talk:2627: Types of Scopes

2022-06-03T18:00:36Z

172.70.175.146:

Wiki's getting hit pretty hard by the trolls this week... [[Special:Contributions/172.69.134.21|172.69.134.21]] 19:02, 1 June 2022 (UTC)
What's with all the vandalism? I know this is the internet, and therefore some vandalism is expected, but YIKES!!! What happened this week? Edit: I don't know who put my message loads, but it wasn't me.[[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 19:16, 1 June 2022 (UTC)
:AGREed. waht is the lore behind these schizophrenics and doug walker! holy fuck --[[Special:Contributions/172.70.34.191|172.70.34.191]] 20:07, 1 June 2022 (UTC)
Fixed it. That was annoying [[Special:Contributions/172.70.174.41|172.70.174.41]] 22:15, 1 June 2022 (UTC)

Another spammer appears to be adding comments about their anatomy and disparaging the reader's mother in the explanation of the title text. It has been added and removed at least twice now (once by me), around 22:35. Keep an eye out for small, annoying trolls like this one, as the spammers may have realized that bombarding the pages with massive images is not the cleanest way to ensure they get their (infantile) message across. [[User:Dextrous Fred|Dextrous Fred]] ([[User talk:Dextrous Fred|talk]]) 22:39, 1 June 2022 (UTC)
:There has also been someone who has seen a dislike to Davidy and me... For instance he has created some [https://www.explainxkcd.com/wiki/index.php?title=User:Davidy22,_the_racist_homosexual,_is_known_to_visit_Norwegian_gay_bars_with_his_boyfriend_Kynde._He_has_cheated_on_Kynde_at_least_twice_with_Vandalbane_(a_big_guy_for_you)._They_all_have_micropenises.&action=edit&redlink=1 very long user names]... Must have taken him some time :-D --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 14:55, 2 June 2022 (UTC)

At least the most obnoxious one seems to be gone (or at least on hiatus). [[Special:Contributions/162.158.107.230|162.158.107.230]] 03:18, 2 June 2022 (UTC)

Randall apparently thinks NPR is the only radio network. It's the only radio I listen too as well. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 13:34, 2 June 2022 (UTC)

Electron Stethoscope would be a cool name for an EIT chest imaging device. [[Special:Contributions/162.158.2.215|162.158.2.215]] 14:28, 2 June 2022 (UTC)
: https://en.wikipedia.org/wiki/Electrical_impedance_tomography -- it uses impedance, which relates to electrons. There is likely something even more analogous for a radio stethescope (near-field coherent sensing equipment uses radio frequencies: https://www.nature.com/articles/s41746-020-0307-6 ). I'm quite surprised that Randall interprets "radio" as meaning "audio broadcast" rather than "electromagnetic" so much here. Maybe he hasn't been doing much EM stuff. [[Special:Contributions/172.70.114.225|172.70.114.225]] 23:46, 2 June 2022 (UTC)

When I first saw the comic title I thought it was going to be about variable scopes in programming. But maybe that would have been too esoteric. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 15:41, 2 June 2022 (UTC)
: I'm thinking there's just so much imagination material already with regard to measurement scopes. Variable scoping is definitely within the content of the webcomic, as far as I know. [[Special:Contributions/172.70.114.225|172.70.114.225]] 23:46, 2 June 2022 (UTC)

I was expecting something about sniper scopes (or rifle scopes). Electron sniper scope looks like a thing from Terminator movie. [[Special:Contributions/141.101.105.35|141.101.105.35]] 21:10, 2 June 2022 (UTC)
: Hey, just what you see, pal... [[Special:Contributions/172.70.85.177|172.70.85.177]] 23:05, 2 June 2022 (UTC)
:: Hello, deadly friend. [[Special:Contributions/172.70.114.225|172.70.114.225]] 23:46, 2 June 2022 (UTC)

Maybe add what the constructed scope is in each cell of the table? e.g. the cell for the radio kaleidoscope would have "radio kaleidoscope:" at the beginning? [[Special:Contributions/172.70.175.146|172.70.175.146]] 18:00, 3 June 2022 (UTC)Bumpf

2627: Types of Scopes

2022-06-01T20:27:54Z

172.70.175.146: Deleted hundreds of pictures.

{{comic
| number = 2627
| date = June 1, 2022
| title = Types of Scopes
| image = Doug Walker and Mike Mozart (15132005215).jpg
| titletext = An x-ray gyroscope is used to determine exactly which toppings they included in the pita.
}}

==Explanation==
{{incomplete|Created by a BOTOSCOPE - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
''{{w|Electron microscopes}}'', ''{{w|Calorimetric Electron Telescope|electron telescopes}}'' and ''{{w|radio telescopes}}'' are special forms of {{w|microscopes}} and {{w|telescopes}}, respectively. This comic explores what you could do with a hypothetical "electron ___-scope" and "radio ___-scope" for other "regular" items whose name also ends in -scope (namely: {{w|periscope}}, {{w|stethoscope}}, {{w|kaleidoscope}}, {{w|gyroscope}} and {{w|horoscope}}).

The third column with "radio" often plays on different meanings of the word ''radio:'' 1) related to radiation and 2) a device for receiving radio communication or broadcasts.

The title text makes a pun on "gyroscope" and the Greek foods {{w|gyros}} which are typically served in {{w|pita}} bread.

===Table with scopes===
{| class="wikitable"
|+ What the words could mean according to the comic
|-
! Word !! Regular ___ !! Electron ___ !! Radio ___
|-
| Microscope || A laboratory instrument used for magnifying small objects. || ''Really exists:'' A microscope that uses a beam of accelerated electrons as a source of illumination, has a higher resolution than a conventional microscope. || Simply a microscope that one would use when repairing a radio.
|-
| Telescope || An optical instrument used for observing distant objects. || ''{{w|Calorimetric Electron Telescope|''Really exists''}}'': A type of telescope used to detect electrons and other high-energy particles, such as cosmic rays. || ''Really exists:'' A directional antenna used to detect radio waves from astronomical radio sources in the sky.
|-
| Periscope || Periscopes allow submarine crews to watch what happens above the water surface, without exposing the submarine to enemy observers, or enemy radars. In practice, periscope use is minimized because periscopes are still observable, but to a lesser degree. || An electron microscope seemingly mounted on a periscope. Examining enemy boats like a periscope, with the detail of an electron microsope. This would not be useful in combat. || In principle, the German navy has invented radio periscopes during World War 2. The {{w|Metox radar detector}}'s early antenna had to be built up after surfacing, and dismantled before diving. Later, the fixed ''Bali'' antenna could act like a true periscope, in order to detect aircraft and ships that were using radar to hunt submarines.

Radio signals do not propagate well in water, so raising a radio receiver above the water would be necessary for listening to NPR or any radio station which is not in the {{w|extremely low frequency}} band.
|-
| Stethoscope
|| A medical device for listening to sounds made by a patient's body, for example the heart. Has a disc-shaped resonator that is placed against the patient's skin.
|| If the resonator is emitting electromagnetic radiation, it could burn the skin due to its close proximity.
|| Normally, the sounds are transmitted to an earpiece that the examiner wears. There are also recording stethoscopes. A radio stethoscope would transmit the sound either directly via radio waves, or send it to a radio station such as NPR where it could then be broadcasted.
|-
| Kaleidoscope || A optical instrument which uses two or more tilted reflectors to show a regular symmetrical pattern || Seemingly a pun of electron "collide"-oscope, as electron collisions generate {{w|Bremsstrahlung}}. || The scan button on a radio scans through many frequencies, and the radio station changes a lot, depending on the frequency. The rapid change is remisiscent of a normal Kaleidoscope.
|-
| Gyroscope || Gyroscopes are used for {{w|inertial navigation}}, for example. || Gyroscopes make stuff point in certain directions by spinning. An {{w|Electromagnet}} uses sometimes-spinning electric fields to induce a magnetic field, moving magnetic stuff and, in some instances, making it point in a certain direction. || A music turntable spins a vinyl record to stimulate an electromagnetic needle, which plays music. Such devices are common in radio stations.

In theory, radio waves could be sent around in a triangular pattern, thus replicating the existing {{w|ring laser gyroscope}}.
|-
| Horoscope
|| In common usage, predictions or advice given based on the position of stars and planets. Proven to be unscientific junk.
|| Predicting the position of a particle, such as an electron (possibly based on the position of stars and planets). In a funny twist, the exact location of an electron cannot be determined, due to Heisenberg's uncertainty principle.
|| Predictions or advice given based on the radiation emitted by exploding stars or galaxies.
|}

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
Content is a table, with column headings "Regular ''Blank'' Scope", "Electron ''Blank'' Scope", and "Radio ''Blank'' Scope". Row headings are "Micro", "Tele", "Peri", "Stetho", "Kaleido", "Gyro", and "Horo".

;Regular Microscope
:Look at small stuff
;Electron Microscope
:Look at ''really'' small stuff
;Radio Microscope
:Figure out why your radio broke
;Regular Telescope
:Look at stuff that's far away
;Electron Telescope
:Detect cosmic rays
;Radio Telescope
:Look at distant high-energy stuff
;Regular Periscope
:Look for enemy ships
;Electron Periscope
:Examine the hull of an enemy ship for structural flaws
;Radio Periscope
:Let the crew of your submarine listen to NPR
;Regular Stethoscope
:Listen to a patient's chest
;Electron Stethoscope
:Burn a patient's skin
;Radio Stethoscope
:Play the noises from a patient's chest on NPR
;Regular Kaleidoscope
:See cool shapes and colors
;Electron Kaleidoscope
:See cool Bremsstrahlung
;Radio Kaleidoscope
:Another word for the "Scan" button
;Regular Gyroscope
:Balance by spinning
;Electron Gyroscope
:Another word for electromagnet
;Radio Gyroscope
:Another word for turntable
;Regular Horoscope
:Get random life advice
;Electron Horoscope
:Predict a particle's quantum state
;Radio Horoscope
:Get random life advice from exploding galaxies

{{comic discussion}}

[[Category:Charts]]
[[Category:Food]]
[[Category:Science]]
[[Category:Space]]

Talk:2625: Field Topology

2022-05-27T14:05:47Z

172.70.175.146:

First [[Special:Contributions/172.70.86.64|172.70.86.64]] 12:50, 27 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)

: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)

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)

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)

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)

Talk:2623: Goofs

2022-05-25T14:27:52Z

172.70.175.146:

I'm getting a 404 error when I try to go to the comic by number. But it shows up on the main xkcd.com home page. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:39, 23 May 2022 (UTC)
: https://xkcd.com/2623/ works for me. [[User:Sollyucko|Sollyucko]] ([[User talk:Sollyucko|talk]]) 16:52, 23 May 2022 (UTC)

Any New Yorkers here to confirm if there's a harpoon store a few blocks from Union Square? If not, that needs to be listed here as a "goof"... I really do love that line suggesting "harpoon stores" are common enough but the nearest one doesn't have an outdoor display. [[User:Ids1024|Ids1024]] ([[User talk:Ids1024|talk]]) 17:18, 23 May 2022 (UTC)
: Remember that it needs to be a harpoon store that was operating in 2018. I think there was a Whalers Я Us near Union Square before it permanently closed during Covid. [[Special:Contributions/172.71.30.33|172.71.30.33]] 20:27, 23 May 2022 (UTC)
:: This comment is facetious, right? [[Special:Contributions/108.162.221.81|108.162.221.81]] 04:38, 24 May 2022 (UTC)

There may not be a store explicitly called a "harpoon store", but there is at least one diving equipment store that has harpoons. [[Special:Contributions/162.158.78.65|162.158.78.65]] 17:27, 23 May 2022 (UTC)
: Yeah, harpoons might be sold at a store that doesn't exclusively or even primarily only sell harpoons, though that wouldn't necessarily change there not being a source for them at the location of the movie scene, let alone the fact that a store that carried them probably wouldn't have them on an outdoor display rack.--[[Special:Contributions/172.69.70.39|172.69.70.39]] 23:36, 24 May 2022 (UTC)

I'm glad Randall Munroe also hates CinemaSins. [[User:Lordpipe|Lordpipe]] ([[User talk:Lordpipe|talk]]) 17:32, 23 May 2022 (UTC)

Nobody tell Randall about [[https://www.moviemistakes.com/]] [[User:Kev|Kev]] ([[User talk:Kev|talk]]) 17:41, 23 May 2022 (UTC)

IMDB is also referenced in: [[2441]], [[155]] (ish), and [[1460]] (in the title text) [[Special:Contributions/172.70.174.91|172.70.174.91]] 20:34, 23 May 2022 (UTC)Bumpf

Do any Muppets movies contain billboards for themselves? That feels like something a Muppets movie would do. [[User:GreatWyrmGold|GreatWyrmGold]] ([[User talk:GreatWyrmGold|talk]]) 20:48, 23 May 2022 (UTC)
:I don't remember any in A Muppets Christmas Carol. But it's been a while since I saw it, so... [[Special:Contributions/172.70.90.145|172.70.90.145]] 22:13, 23 May 2022 (UTC)

as soon as i saw the "goofs" section of the explanation itself i started wheezing harder than i had at any other explainxkcd page ever. whosoever idea that was, you are a genius --[[Special:Contributions/172.70.34.171|172.70.34.171]] 02:09, 24 May 2022 (UTC)
:I just dropped by to say "Bravo!" to whoever worked on the GOOFS section. (I didn't check the page history.) [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 02:39, 24 May 2022 (UTC)
:: I did check the page history but couldn't figure out who started and added to "Goofs." I agree that the section is genius. [[Special:Contributions/108.162.221.81|108.162.221.81]] 04:38, 24 May 2022 (UTC)
::: It looks like it was [[User:Kev|Kev]] how added the "goofs" section [[User:Kvarts314|Kvarts314]] ([[User talk:Kvarts314|talk]]) 10:19, 24 May 2022 (UTC)
::::Yes he added the first entry, but others have added the rest. I'm uncertain I think it belongs here, but it is funny. Maybe move it down under the transcript?--[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 11:50, 24 May 2022 (UTC)
:::::IMO, it has the same 'status' as a Trivia section (it is one of those in almost every regard, after all), which is traditionally placed post-Teanscript. But I'm not a prescriptionist, at least not in this case, just saying I think it'd be consistent. If you even need my anonymous support for such a trivial within-page move. [[Special:Contributions/141.101.98.11|141.101.98.11]] 11:57, 24 May 2022 (UTC)
:::::In my opinion it does not "nothing to explain the comic" - quite the contrary: It's the best way to explain what the comic is about. See https://tvtropes.org/pmwiki/pmwiki.php/Main/SelfDemonstratingArticle and https://tvtropes.org/pmwiki/pmwiki.php/Main/ComicallyMissingThePoint [[User:Elektrizikekswerk|Elektrizikekswerk]] ([[User talk:Elektrizikekswerk|talk]]) 13:17, 24 May 2022 (UTC)
:::::You people are the reason I always press "Go to this comic explanation" first thing I visit. Love you all![[Special:Contributions/172.68.50.91|172.68.50.91]] 18:04, 24 May 2022 (UTC)

Random movie goof validates Randall, as expected: 
I picked "The Game", one of my favourites, but also because it's set in SF and has many outdoor scenes. 
Sure enough, there were several trivial goofs, but not location-wise. 
Check this one out: 'In the end credits, rigging grip Michael Santoro's name is spelled "Micheal".' 
Followed by this: 'In the end credits, there's an extra space between actor André Brazeau's first and last names.' [[User:Beechmere|Beechmere]] ([[User talk:Beechmere|talk]]) 04:22, 24 May 2022 (UTC)Beechmere
:This is why there are now different types, so you can jump over the borring to those with plot points, or errors by characthers... --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 11:52, 24 May 2022 (UTC)

"Spaceballs" is a notable exception to "Most movies do not exist within the fictional world they portray." When will then be now? Soon! [[Special:Contributions/172.70.175.146|172.70.175.146]] 14:27, 25 May 2022 (UTC)

Talk:2588: Party Quadrants

2022-03-04T21:30:43Z

172.70.175.146:

I added a first draft. I'm sure someone can make it better.
:The Venn diagram specifically says ''my'' birthday party. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 00:01, 3 March 2022 (UTC)

I can't be the only person who thinks I'd like to go to that party. [[User:Angel|Angel]] ([[User talk:Angel|talk]]) 23:44, 2 March 2022 (UTC)
:Randall doesn't think so, as evidenced by his placing it about an eighth of the way down the chart, rather than completely in the top right - he thinks it will at least be some fun for some people. [[Special:Contributions/172.70.91.126|172.70.91.126]] 14:02, 3 March 2022 (UTC)
:That party sounds fun! I like to see how fast I can name all the countries in the world in alphabetical order on Sporcle![[User:Mathmannix|Mathmannix]] ([[User talk:Mathmannix|talk]]) 02:20, 4 March 2022 (UTC)

Competitions are not uncommon at parties. E.g. "pin the tail on the donkey". [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 00:01, 3 March 2022 (UTC)
: I assume the "not fun" for others part is trivia, specifically geography trivia. [[Special:Contributions/172.70.206.163|172.70.206.163]] 01:05, 3 March 2022 (UTC)
:: I am clearly Randall. I definitely cannot organise parties. The last BBQ I tried to organise, for the neighbours, was pre-Millenium. The weather did ''not'' cooperate and the neighbours moved away within only 10-15 more years!
::(I also haven't even had a birthday party since the early '80s, and haven't minded missing the stressfulness of the occasion at all.)
::Oh, and of course I do love a good map-based problem. [[Special:Contributions/141.101.99.32|141.101.99.32]] 01:50, 3 March 2022 (UTC)

;Why are there no examples of party games in the other 3 quadrants?
Am I missing something important? For the other 3 quadrants, why are there no examples of party games that may be enjoyed/not enjoyed. Eg; Squid Game (not enjoyed by anyone), TenPin Bowling (probably enjoyed by everyone). [[User:Beechmere|Beechmere]] ([[User talk:Beechmere|talk]]) 02:09, 3 March 2022 (UTC)Beechmere
:Less is more? There's three things. Two different 'party zones' that pretty much are the same thing, except for slight birthday-boy/host differences in emphasis, and the party that ''happens'', which is a self-indulgent planned activity that lies entirely outside those. :There are probably an infinite number of other 'party game spots' to place, but I think it's funny enough to show 'reality doesn't match theory' in just the one highly specific way. YMMV, but that's my interpretation. [[Special:Contributions/172.70.90.173|172.70.90.173]] 03:22, 3 March 2022 (UTC)
::Agree. The joke is that this diagram clearly indicates where his party should lie on this diagram. Fine if it's his birthday, it's OK it is more fun for him than the guest, but not so it would move up to not fun for the guest. And then he adds his latest attempt at a party, which is extremely fun to him and extremely dull for his guests, a long way from what is appropriate for a party. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 07:59, 3 March 2022 (UTC)
The statement "while music would be considered fun for most people" should be removed or a [citation needed] added. People have no concept of appropriate volume and have different taste in music, making it no fun, or alternatingly fun, for most attendees. Parties are much more fun when you can actually hear and understand the people around you.
: Depends on the party, otherwise people wouldn't go into discos. [[User:Elektrizikekswerk|Elektrizikekswerk]] ([[User talk:Elektrizikekswerk|talk]]) 12:50, 4 March 2022 (UTC)

The snacks are probably why the Sporcle geometry party isn't further up on the graph. But they're not enough by themselves to move the party into the "fun for guests" half. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 18:07, 3 March 2022 (UTC)

I am puzzled by Randall's guest list. If he is inviting random people off the street, why is he inviting random people off the street? If he enjoys geography trivia, why doesn't he know people who enjoy geography trivia? Clearly there is something more deeply wrong with his party organizing than simply having non-conventional tastes. This should be discussed. A Zorn's lemma themed party is great fun if you invite the right people.[[Special:Contributions/172.70.175.146|172.70.175.146]] 21:30, 4 March 2022 (UTC)

Talk:704: Principle of Explosion

2022-02-22T02:50:06Z

172.70.175.146:

Could Mrs Lenhart be Miss Lenhart's mother, perhaps? This makes Cueball-1 Miss Lenhart's brother (and thus possibly "Cueball Lenhart", unless he's a half-brother or step-brother or the like). Of course with provably two Cueballs in this situation (and assuming they aren't twins, unless #2... no, we won't go there) we can't therefore assume that any particular lone Cueball is related. However, if "Cueball is a Lenhart AND Cueball is not a Lenhart" then.... well, lock up your mothers... <smirk> [[Special:Contributions/31.111.50.225|31.111.50.225]] 22:01, 7 May 2013 (UTC)

^ genealogy makes my head durt. [[Special:Contributions/103.9.42.158|103.9.42.158]] 20:22, 19 October 2013 (UTC)

Hey, what do waffle cones and box wine have to do with each other? Wouldn't the cones just get soggy? Just wondering. Anonymous 18:30, 9 December 2014 (UTC)
:This is what I came here to figure out. "Oh, right, for the wine" makes it sound like it's supposed to be obvious. [[Special:Contributions/108.162.210.177|108.162.210.177]] 00:51, 28 March 2015 (UTC)
::Logically the waffle cones are unrelated to the wine, it's a separate item. -Pennpenn [[Special:Contributions/108.162.250.162|108.162.250.162]] 00:55, 18 May 2015 (UTC)
::I thought the joke was that Cueball's mother was cheap and tasteless because she enjoys drinking boxed wine out of waffle cones. [[Special:Contributions/108.162.238.172|108.162.238.172]] 17:24, 28 September 2015 (UTC)
:::Using the principle of explosion, boxed wine and waffle cones are very much related, and are essentially the same thing. [[Special:Contributions/108.162.229.210|108.162.229.210]] 01:29, 7 August 2015 (UTC)

Gah, unpaired parentheses... [[Special:Contributions/108.162.221.150|108.162.221.150]] 05:48, 17 August 2015 (UTC)
:I added the end parenthesis, just for you. Although, now I'm wondering if double parentheses are really the best alternative... --[[User:Hammy2211|Hammy2211]] ([[User talk:Hammy2211|talk]]) 17:09, 8 October 2015 (UTC)

There was a [[explain_xkcd:Community_portal/Proposals#Merge_Cueball_.26_Rob|community portal discussion]] of what to call Cueball and what to do in case with more than one Cueball. I have added this comic to the Category:Multiple Cueballs. Since here it is clearly the Cueball that calls the mom who is the protagonist and do the important "talking" of this comic he should be listed as Cueball (if any of them). So have rephrased the explanation to take this into account and also noted that the "friend" also looks like Cueball... --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 15:44, 24 November 2015 (UTC)

Beret Guy lost his hat? I hope he finds it! [[Special:Contributions/172.70.175.146|172.70.175.146]] 02:50, 22 February 2022 (UTC)