explain xkcd - User contributions [en]

2923: Scary Triangles

2024-12-21T22:38:09Z

162.158.186.252: /* Explanation */ role of Jaws

{{comic
| number = 2923
| date = April 22, 2024
| title = Scary Triangles
| image = scary_triangles_2x.png
| imagesize = 303x369px
| noexpand = true
| titletext = Concealed mostly beneath the surface, sharks are the icebergs of the sea.
}}

==Explanation==
[[Cueball]] is giving a marine biology lecture about sharks and seems to have mixed up icebergs with the topic.

In pop culture, {{w|shark}}s will often approach prey or people with only their front {{w|dorsal fin}} visible, which looks like a triangle, above the water. As far as its usual marine prey is concerned, this is inaccurate, as most sharks will attack from below to keep the element of surprise. From the human perspective, we're just more used to (and capable of) seeing the surface of the sea so, most of the time, if we actually ''know'' that there is a shark in the area then it's because it is currently swimming close enough to the surface to have its dorsal fin conspicuously sticking into the air - whether or not it is a hunting shark, a dangerous shark or even an actual shark. Another contributing factor is the movie Jaws, in which, due to problems with the animatronic shark, most scenes where filmed with the shark mostly or completely hidden.

In the comic the joke is that Cueball reveals that marine biologists have only recently learned that the triangle is only a small part of a shark. Until this revelation people were only aware of the visible portion, and the fact that death and injury often occurred when they arrive, causing them to be known as 'scary triangles'. Finally the community has learned that more than 90% (i.e. the rest of the shark's body) is hidden beneath the surface. (In most, if not all, cases it would actually be ''significantly'' more than 90%.)

The 90% is borrowed from an often cited factoid about {{w|iceberg}}s: that 90% of their volume is underwater (see also [[2829: Iceberg Efficiency]]). This follows from the relative densities of ice and water: the fraction under water is the density of the ice divided by the density of the water. For pure ice just below freezing in pure water just above freezing this would be 0.92 kg/L / 1 kg/L = 92%. However sea water has a density of 1.03 kg/L, leading to 89%. In reality icebergs are made of compressed snow (which has a lower density) and may be filled with air cavities, leading to lower densities.

Having learned that a similar fact is true of sharks, Cueball has drawn a dotted outline of the shark's body, equivalent to that often depicted in diagrams of icebergs, beneath the scary triangular fin, to show what a shark looks like under the surface. Cueball's enhanced analysis has so far failed to identify some of the {{w|Shark tooth|even more scary triangles}} that more often stay below water, and would be experienced proportionately more in actual attack situations, also leaving critical leaky holes in the body.

The title text continues the joke explicitly, saying that sharks are the "icebergs of the sea." However, icebergs are already the icebergs of the sea.{{Citation needed}} A better name would be "icebergs in the animal kingdom".

==Transcript==
:[Cueball points with a stick to a poster hanging behind him to the left. The poster has a diagram of a shark. The dorsal fin is shown above a wavy surface of water. The part of the outline of the shark that are under water are drawn in dashed lines. There are unreadable text in the top and bottom left corner, and two labels with lines that points to its dorsal fin and its gills. Cueball's stick points to the label near the gills]
:Cueball: Today's marine biology lecture is on '''sharks'''. We all know them as the scary triangles of the sea, but recent research has revealed that the triangle is only a small portion of the shark - over 90% of it is hidden beneath the surface.

==Trivia==
This is the second comic in a row to mention sharks (the previous being [[2922: Pub Trivia]]), and the third out of the last five to mention large marine predators in some way (the first being [[2919: Sitting in a Tree]]).

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Public speaking]]
[[Category:Biology]]
[[Category:Sharks]]

Talk:3022: Making Tea

2024-12-10T05:14:58Z

162.158.186.252:

I wonder where [https://en.wikipedia.org/wiki/Boston_Tea_Party making it in Boston Harbor, at ambient temperature, at scale] would fit on this scale. [[Special:Contributions/172.70.206.162|172.70.206.162]] 04:38, 10 December 2024 (UTC)
: A little to the left of the microwave thing. [[Special:Contributions/162.158.186.252|162.158.186.252]] 05:14, 10 December 2024 (UTC)

Talk:3011: Europa Clipper

2024-11-14T20:10:27Z

162.158.186.252: grammar

I'm not brave enough to actually add an explanation myself, quite yet, but ... I guess this is a reference to the fact(?) that Europa looks a bit like a creme brulee', when viewed from space? https://science.nasa.gov/jupiter/moons/europa/ It does look tasty ... :) [[User:ModelD|ModelD]] ([[User talk:ModelD|talk]]) 12:53, 13 November 2024 (UTC)
:I suspect it's more due to the need to drill through a couple miles of ice to get to the ocean; much like breaking through the sugar crust on a creme broule! [[User:Seebert|Seebert]] ([[User talk:Seebert|talk]]) 13:16, 13 November 2024 (UTC)

Thank you to the people at 9AM Post things on another website to try and explain XKCD Comics. -Forgotten_Mail {{unsigned ip|172.69.33.177|13:30, 13 November 2024}}

The comically large spoon!!!!!!!!!! I love those. -[[User:Psychoticpotato|P?sych??otic?pot??at???o ]] ([[User talk:Psychoticpotato|talk]]) 16:38, 13 November 2024 (UTC)
: Don't be sucked in! Protect yourself! https://rathergood.com/2017/02/10/spoonguard/ [[Special:Contributions/141.101.99.105|141.101.99.105]] 10:57, 14 November 2024 (UTC)

I think the "Crème brûlée is from France, France is in Europe, the moon is called Europa" connection is a bit of a stretch...? [[User:Yorkshire Pudding|Yorkshire Pudding]] ([[User talk:Yorkshire Pudding|talk]]) 18:36, 13 November 2024 (UTC)
: Eh, it's the same etymology. --[[Special:Contributions/172.69.134.230|172.69.134.230]] 11:04, 14 November 2024 (UTC)
:: The issue of the continent and the moon coming from the same classical source (for different reasons) rather stretches the link between the dish (from the country, from the country's region/continent, from the region of Greece, ''possibly'' from the pantheon) and the moon (directly from the pantheon). I agree with the 'stretch' assessment. You can probably find easier and more plausible (but wrong) links worth alluding to than that, which relies upon several steps and a ''possible'' polysemic pair of original links. [[Special:Contributions/172.70.58.45|172.70.58.45]] 12:12, 14 November 2024 (UTC)
:::From an American perspective, Europe might seem like a distant, mysterious place that you might want to send a probe to to gather interesting information, and also somewhere that crème brûlée comes from. It's also potentially confusable (by the easily confused) with Europa. That seems like a reasonable enough connection to make to me. The mention of France is essentially by the by.[[Special:Contributions/172.71.26.107|172.71.26.107]] 12:23, 14 November 2024 (UTC)
:::It keeps getting said that "Europa is named after Europe", '''which is not correct''' (etymology, BTW, not entomology). I shall have to re-restore some other changes made to the same paragraph in rapid succession whilst I was trying to explain this. Bear with me. [[Special:Contributions/172.70.160.195|172.70.160.195]] 14:57, 14 November 2024 (UTC)
:::...You don't care, do you. You just keep putting it back in. SMH. Have fun. Someone else will probably be along to correct you ''again'' later. [[Special:Contributions/141.101.68.92|141.101.68.92]] 15:35, 14 November 2024 (UTC)

"only a spoonful" moment 💔 [[User:CalibansCreations|'''Caliban''']] ([[User talk:CalibansCreations|talk]]) 19:20, 13 November 2024 (UTC)

Someone should add a reference to XKCD's previous mention of a Planetary Protection Officer: https://what-if.xkcd.com/117/ [[Special:Contributions/162.158.42.221|162.158.42.221]] 00:09, 14 November 2024 (UTC)

JUICE mentioned!!! cracker ham cheese cracker ham cheese cracker [[User:N-eh|N-eh]] ([[User talk:N-eh|talk]]) 07:31, 14 November 2024 (UTC)
: Edited out, alas. It's a fascinating, and entertaining, experience to set up a starter explanation and then watch it bubble and froth. As with the crème | France | Europe | Europa trajectory (in which I had no part after posting the starter). [[Special:Contributions/108.162.245.113|108.162.245.113]] 18:46, 14 November 2024 (UTC)

Here is a list from NASA about spacecraft instrument deployment failures, they are remarkably frequent: https://ntrs.nasa.gov/api/citations/20210020397/downloads/Alphonzo%20Stewart-%20Final%20Paper.pdf [[Special:Contributions/162.158.19.50|162.158.19.50]] 13:00, 14 November 2024 (UTC)

I think we need to have a conversation about how the insertion orbit plan is so chaotic that there is a significant chance that the probe might crash in to and pierce the crust of Europa. [[Special:Contributions/162.158.187.56|162.158.187.56]] 14:36, 14 November 2024 (UTC)
:...and if so, what's the likelihood of hitting just the right angle to scrape off a tasty bit with that spoon? [[User:Transgalactic|Transgalactic]] ([[User talk:Transgalactic|talk]]) 16:04, 14 November 2024 (UTC)
::What would you like it to be? I can't step on butterflies, but I can certainly act according to the purest form of free will by strapping a noise bridge diode to my corpus callosum. [[Special:Contributions/108.162.246.83|108.162.246.83]] 16:17, 14 November 2024 (UTC)
:Well we just need Elon to lock in the plan that if it crashes then it automatically becomes a sample return mission, and the first SolarCity sales rep to break out +150% of their quota gets to be the one to crash it. [[Special:Contributions/162.158.42.130|162.158.42.130]] 15:56, 14 November 2024 (UTC)
::What part of "Attempt No Landing There" is unclear to you? [[User:Liv2splain|Liv2splain]] ([[User talk:Liv2splain|talk]]) 18:36, 14 November 2024 (UTC)
::In all seriousness, the liquid water is a good reason to be extremely careful so you don't end up detecting {{w|tardigrade}}s, {{w|deinococcus radiodurans}}, or {{w|bacillus subtilis}}. [[Special:Contributions/172.70.214.166|172.70.214.166]] 19:16, 14 November 2024 (UTC)

I can ''not'' believe I got ChatGPT to make this for me:
{{cot|You have been warned}}

Europa was this smart, ambitious woman just trying to make it out there in the Mediterranean startup scene. She had her plans, her own thing going on, some solid friends, and a bright future. She wasn’t looking for anything too complicated; she just wanted to keep her options open and figure out her next big move.

Enter Zeus. Now, picture him as that intense CEO type—big, powerful, kind of legendary for his influence (and his *questionable* reputation). He’s been around the block a few times, always looking for the next exciting project or, well… person. Zeus saw Europa, and she was exactly his type: sharp, resourceful, had a lot of potential. He was like, "Yeah, I need *that* in my portfolio."

But Zeus was a little extra with his tactics. Instead of just, you know, scheduling a coffee chat or reaching out on LinkedIn like a normal person, he came up with this elaborate scheme. He disguised himself as this beautiful white bull (yeah, Zeus was *that* guy who would make things way more complicated than necessary). He wandered down to the shore near Europa and her friends, looking majestic and mysterious, and let her come to him.

Europa, understandably, was like, "This bull is kind of weirdly friendly and actually pretty cool." She got curious, went closer, and Zeus played it super smooth, staying calm and approachable. When she got comfortable enough, she even climbed onto his back for a ride—just for fun! I mean, who hasn’t hopped onto a crazy idea because it seemed cool at the time, right?

But then things got wild. Suddenly, Zeus took off, sprinting across the beach and straight into the sea. He didn’t just want to show her the local scene; he was taking her across the entire Mediterranean to Crete, like some super intense onboarding retreat she hadn’t signed up for. By the time they got there, she was probably exhausted, confused, and questioning her life choices.

And here’s the kicker: once they arrived, Zeus was like, “Oh hey, it’s me! Not just some chill bull—surprise, I’m Zeus.” At this point, Europa realized she was in way deeper than she’d ever expected. She ended up staying in Crete, becoming queen and building a legacy, which, sure, sounds great on paper. But you have to wonder if that’s what she really wanted in the first place, or if she was just swept up in the whirlwind of Zeus's charm and grand promises.

So, in the end, Europa's career ended up in a place she never saw coming. She became a name people would remember for centuries, but not necessarily on her own terms. It’s the classic millennial dilemma: she got a high-profile "role" with Zeus, but did she really get to build her own brand, or was she just another line in Zeus’s impressive (and very long) resume?

Maybe Europa would look back on this “opportunity” and think, “Did I even want this? Or did I just get pulled into someone else’s grand plan?” A classic case of getting lost in the allure of “networking,” and honestly, a pretty good reminder to always check out who’s really behind the bull.
{{cob}}
[[Special:Contributions/172.68.23.82|172.68.23.82]] "This bull is kind of weirdly friendly and actually pretty cool" 16:03, 14 November 2024 (UTC)
::"Europa was this smart, ambitious woman...." She was a {{w|nepo baby}}. [[Special:Contributions/172.70.206.231|172.70.206.231]] 18:55, 14 November 2024 (UTC)
:ChatGPT should have learned long ago that it's not cool to reproduce rape culture. But I guess AI just doesn't get better than its training material... [[User:Transgalactic|Transgalactic]] ([[User talk:Transgalactic|talk]]) 16:34, 14 November 2024 (UTC)
::It is apparently aware of the issue:
:::"The myth of Zeus and Europa is problematic from a modern perspective, especially concerning consent. Europa willingly approaches and even climbs onto Zeus, who is disguised as a bull, suggesting an initial level of curiosity and comfort. However, Zeus’s sudden abduction of Europa—taking her across the sea to Crete and revealing his true identity only after they arrive—shows a disregard for her autonomy, as she never consented to go with him under those terms. Her actions are based on Zeus’s deception, and without knowing his true intentions, her choice was not fully informed. In Greek mythology, such abductions were common symbols of divine intervention, reflecting a worldview where gods often overpowered human agency, a stark contrast to today’s emphasis on consent and personal autonomy."
::The issue with Zeus's behavior was tempered by the story that he gave Europa a kingdom to rule and all the riches and luxuries that came with it. Isn't that the way bad boyfriends are excused in our day and age? [[Special:Contributions/172.70.211.143|172.70.211.143]] 17:45, 14 November 2024 (UTC)
:::Like [https://krapopolis.fandom.com/wiki/Krapopolis#:~:text=Tyrannis%2C%20the%20mortal%20son%20of,self%2Ddestruction%20and%20questionable%20choices. King Tyrannis] in {{w|Krapopolis}}? All that glitters is not gold. [[Special:Contributions/172.68.22.93|172.68.22.93]] 18:02, 14 November 2024 (UTC)
::Given how it's likely not Zeus's momentary crush, that was the Europa concerned (naming the river, region then contintent), all that ChatGPT stuff is interesting but very likely going down totally the wrong trail of ideas. Of course, the phylomemetic development of legends is probably very mixed up, and trying to trace what figures certain phonemes originally refered to (before being cooked and remixed in countless oral 'history' retellings with few written standard versions to keep them static and consistant) is an art in itself. [[Special:Contributions/172.71.26.42|172.71.26.42]] 19:31, 14 November 2024 (UTC)
:::The Greek myths were handed down in writing and by the oral tradition. They are absolutely diverse but the common threads are a large part of what an entire middle age of clerical monks have bestowed upon Western culture. In that tradition, Europa kept her gift kingdom instead of returning home, which suggests some measure of consent after the fact. If you were given a huge island kingdom because some god-bull decided to take you for a surprise swim, would you refuse it? [[Special:Contributions/172.70.211.129|172.70.211.129]] 19:33, 14 November 2024 (UTC)
::::Since more 'modern' times (to speak of monks, you'd generally be talking about mediæval times onwards, though some priests and scholars of pre-christianity eras may have played some similar roles beforehand), they may have been 'well' documented, but we're talking about bronze-age-and-earlier (mostly) oral traditions that bumbled along for a long time with few persisting writings/engravings. Imagine what ancient records were lost in Alexandria/other destructions, or sat upon stone/clay that has since lain undiscovered for cdnturies but likely crumbled well beyond the ability of any lucky archaeologist to reconstruct.
::::And not all of the {{w|Europa (Greek myth)|various women/beings of that name}} could have been just retellings of the same 'original' (with deviations). Zeus's Europa likely, in fact, far post-dates the examples rooted in the pre-Olympian pantheon. Either in 'actual legend' or in the tales that developed to explain the current understanding of the soap-opera that was what gods/titans/whatever had performed to get from the creation of the world to 'now'. [[Special:Contributions/172.69.43.183|172.69.43.183]] 19:52, 14 November 2024 (UTC)
:::::I suggest that scholars of Christianity may not have as accurate of a take on the Greek myths as agnostic scholars of the Greek classical works and recorded traditions.[https://www.mdpi.com/2410-9789/3/3/20] [[Special:Contributions/162.158.186.253|162.158.186.253]] 20:09, 14 November 2024 (UTC)

3011: Europa Clipper

2024-11-14T14:31:53Z

162.158.186.252: /* Explanation */ naming

{{comic
| number = 3011
| date = November 13, 2024
| title = Europa Clipper
| image = europa_clipper_2x.png
| imagesize = 333x356px
| noexpand = true
| titletext = They had BETTER make this a sample return mission.
}}

==Explanation==
{{incomplete|Created by a JOVIAN DESSERT. Please consider deleting this tag too soon, but refrain from doing so.}}

[[File:Animation of Europa Clipper trajectory around Jupiter.gif|thumb|right|The ''Europa Clipper's'' projected course around {{w|Jupiter}}, represented as the stationary green dot. In gold is Jupiter's moon {{w|Callisto (moon)|Callisto}}, in cyan is the moon {{w|Europa (moon)|Europa}} — the primary target of the spacecraft's study — and in orange-red is the innermost of Jupiter's four {{w|Galilean moons|"Galilean"}} moons, {{w|Io (moon)|Io}}. The spacecraft's track is shown in magenta. Jupiter's largest moon {{w|Ganymede (moon)|Ganymede}} and its second largest moon {{w|Titan (moon)|Titan}} are not shown, but their gravitational pull affects the ''Clipper's'' trajectory. A mission goal is to achieve a 6:1 {{w|orbital resonance}} with Europa by September 2034.[https://www.researchgate.net/profile/Martin-Ozimek/publication/383115312_AAS_24-433_Europa_Clipper_Mission_Analysis_Pump_Down_Trajectory_Design/links/66bcd845311cbb094938dbd6/AAS-24-433-Europa-Clipper-Mission-Analysis-Pump-Down-Trajectory-Design.pdf] ]]

The ''{{w|Europa Clipper}}'' space probe was launched from the {{w|Kennedy Space Center}} in Florida on October 14, 2024. It is expected to arrive at Jupiter and begin exploration of Jupiter's moons, particularly {{w|Europa (moon)|Europa}}, in April of 2030.

Europa is an icy moon. Water ice covers its surface. Beneath the ice, there is expected to be liquid water, which might contain living microbes.[https://europa.nasa.gov/why-europa/ingredients-for-life/] To sample this liquid, its crust (water ice) would need to be broken.

In the comic, Europa's surface ice is likened to the caramel crust on the dessert ''{{w|crème brûlée}}''. To eat this dessert, its crust is broken with a spoon. The dessert is believed to have been [https://archive.org/details/lagastronomieaug00sabb/page/272/mode/2up invented in Europe], after which the moon and the space probe were named. Thus [[Randall]] suggests the spacecraft might encounter crème brûlée, and has so been equipped with a spoon for the purpose of collecting samples, as spoons are the traditional {{w|tableware}} provided for eating such desserts. More directly, the {{w|Cassini-Huygens}} probe, after landing on the surface of Saturn's moon Titan in January of 2005, found that ''its'' surface had what was described as [https://www.sciencenews.org/article/world-unveiled-cr%C3%A8me-br%C3%BBl%C3%A9e-titan a "crème brûlée" consistency], although there are significant differences between the two moons.

No such spoon is present on the ''Europa Clipper.''{{cn}} Its course is designed to avoid contact with Europa so as to prevent {{w|Planetary protection|contamination by microorganisms from Earth}}. The spacecraft is, however, equipped with a magnetometer at the end of a 8.5 meter deployable boom. Deployable instruments on spacecraft have often failed to deploy correctly, so the successful deployment of any instrument is considered a cause for celebration.

The title text expands on the joke by stating that the spacecraft "had BETTER" return samples of Europa to Earth. However, the ''Europa Clipper'' is not a {{w|sample-return mission}}.

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

:[A space probe with two rectangular solar panels, a circular dish of the front, and a very large spoon extending beneath, longer than the span of both solar panels]

:[Below the panel:]
:Good news: NASA's '''''Europa Clipper''''' is en route to Europa and has successfully deployed its crème brûlée spoon.

==Trivia==
The Clipper spacecraft was at one point to be developed alongside a lander, which was later dropped from being part of the same (or very closely partnered) mission. The latest version of the {{w|Europa Lander}} proposal is far behind the Clipper in implementation, not yet even being guaranteed funding.

Any actual sample return mission is currently far into the future of {{w|Ocean Worlds Exploration Program|the related plans for exploration}}, along with the possibility of digging deep enough into the ice to finally confirm or dismiss some of the more interesting theories about the world concerned.

In Arthur C Clarke's novel '''2010''', the monolith aliens tell humanity ''"All these worlds are yours - except Europa. Attempt no landing there."'' Contrary to the suggestion of the comic, no landing or any other physical interaction beyond observation of the surface of Europa is planned.

{{comic discussion}}
[[Category:Space]]
[[Category:Space probes]]
[[Category:Food]]

2962: President Venn Diagram

2024-08-07T03:58:59Z

162.158.186.252: /* Explanation */ same paragraph

{{comic
| number = 2962
| date = July 22, 2024
| title = President Venn Diagram
| image = president_venn_diagram_2x.png
| imagesize = 445x398px
| noexpand = true
| titletext = Hard to imagine political rhetoric more microtargeted at me than 'I love Venn diagrams. I really do, I love Venn diagrams. It's just something about those three circles.'
}}

==Explanation==
{{notice|This comic contains just one opinion as interpreted by [[Randall|the comic's author]].
Please take care to not add anything to this explanation that might be your own personal political opinion. |image=warning!!.png|**NB. This warning could remain as long as Harris is a candidate in the election. Once this process concludes, we might need a different warning.}}

On the Monday that this comic was published, US Vice President {{w|Kamala Harris}} became the new presumptive {{w|Democratic_Party_(United_States)|Democratic Party}} nominee for the 2024 presidential election, having received verbal endorsements from a majority of Democratic state delegations; the day before, President {{w|Joe Biden}} had {{w|Withdrawal_of_Joe_Biden_from_the_2024_United_States_presidential_election|suspended his re-election bid}} and endorsed Harris. These major events resulted in Harris replacing Biden as one of the top two candidates for {{w|President of the United States|President}} in the 2024 election.

This comic features a three-way {{w|Venn diagram}} (which [[2721: Euler Diagrams|is also an Euler diagram]]). The three circles represent eligibility for US presidency, ability to do a good job as the US president, and love for Venn diagrams:

# '''Good President:''' [[Randall]] believes Harris would be a good president and implies as much, while making the reasonable assumption that he would not be. On the day this comic was published, a top Internet conversation topic was people's opinions of Harris, given the surprise nature of her candidacy, so Randall is adding in his opinion.
# '''Eligibility:''' According to Article II of the {{w|US Constitution}}, someone is {{w|President_of_the_United_States#Eligibility|eligible for the presidency}} if they are a natural-born citizen of the United States, are at least 35 years old, and are a resident in the United States for at least 14 years. Both Randall Munroe and Kamala Harris meet these qualifications. Additionally, the 14th amendment forbids those who have engaged in insurrection against the United States from holding public office without a two-thirds vote of the Congress to allow them to. Harris' opponent is widely considered to have engaged in an act of insurrection on January 6th, 2021, and it will likely fall to the Supreme Court to decide whether or not the presidency counts as a public office.
# '''Vocal Venn diagram affection:''' Harris' affection for Venn diagrams is something of a meme, and has been used by her in her campaign [https://www.independent.co.uk/news/world/americas/us-politics/kamala-harris-campaign-memes-gen-z-b2583802.html]. Randall is also known for his love of Venn diagrams, which feature heavily in xkcd. Randall especially loves Venn diagrams ABOUT Venn diagrams, like this one. While Harris frequently uses Venn diagrams with three intersecting circles as props, she also has [https://www.c-span.org/video/?c5125622/user-clip-circle-venn-diagram discussed them in the abstract, without reference to any physical diagram, even when discussing more than three intersecting categories.]

Part of the humor arises from the contrast of putting on a level playing field three characteristics that range widely from the momentous to the quirky, as well as the implication that Randall and Harris are quite similar in all but one area: their fitness to serve as US President, per Randall's opinion. The diagram does not indicate anyone who Randall would include in the six other areas (categories) of the Venn diagram besides the two in which he listed himself and Harris.

The title text [https://www.youtube.com/watch?v=eWR2uTfrh-k quotes Kamala Harris on her affection for Venn diagrams], and implies that the best way to target Randall with political ads is to mention how amazing Venn diagrams are.

Randall seems to express support for a Democratic Presidential candidate every 8 years, including in a 2016 comic [[I'm With Her]] endorsing {{w|Hillary Clinton}} and in [https://blog.xkcd.com/2008/01/28/obama/ a 2008 blog post] endorsing {{w|Barack Obama}}. In 2032 he will endorse [attention time-travelers/future editors, please edit this part to fill in whoever is running for president, and whether [[1688|the spiders are able to vote]].], followed by [same here] in 2040, Gabriele Cirulli in 2048, and X Æ A-12 Musk in the 2056 United States of America and Mars (USAM) election.

==Transcript==
:[A Venn diagram with three circles.]
:[Upper left circle:] Eligible to be President
:[Upper right circle:] Would be a good President
:[Lower circle:] Unusually vocal about love of Venn diagrams
:[Intersection of all three circles:] Kamala Harris
:[Intersection of the upper left and lower circles:] Me

{{comic discussion}}

[[Category: Venn diagrams]]
[[Category: Politics]]
[[Category: Elections]]
[[Category: Comics featuring politicians]]

2967: Matter

2024-08-03T06:39:42Z

162.158.186.252: /* Explanation */ more common preposition

{{comic
| number = 2967
| date = August 2, 2024
| title = Matter
| image = matter_2x.png
| imagesize = 234x341px
| noexpand = true
| titletext = He was the first person to land a 900, which is especially impressive because pulling off a half-integer spin requires obeying Fermi-Dirac statistics.
}}

==Explanation==
{{incomplete|Created by a GOOFY FRONTSIDE WIKI GRIND TO SECRET PHYSICS DEMO TAPE - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

In {{w|skateboarding}}, the term 'goofy' means to push with the left foot, using the {{w|Footedness#Goofy_stance|opposite stance}} to standard footing, a stance pushing with one's right foot. The comic uses this as a analogy for {{w|antimatter}} in particle physics, which exhibits the opposite charge to ordinary matter and will destroy both upon collision, releasing energy proportional to their combined mass in a process called annihilation. {{w|Tony Hawk}}, an ex-professional skateboarder of great renown, has apparently obtained a professorship and is teaching this very non-standard theory. Professor Hawk's appearance could be a play on the name of {{w|Stephen Hawking}}, a famous astrophysicist and professor at the University of Cambridge before his death in 2018. As Tony Hawk does not have a degree in physics,{{citation needed}} teaching inaccurate lessons would be a likely pitfall of his professorship.

This analogy also indirectly raises the problem of {{w|baryon asymmetry}}, in which ordinary matter appears to be much more common than antimatter, unlike most distributions of handedness,{{citation needed}} chemical {{w|chirality}}, or the {{w|skewness}} of {{w|Multimodal_distribution|bimodal statistics}} describing asymmetries in nature (called {{w|homochirality}}, e.g., organ shape and centering, or plants favoring one branch over the other at a fork) and in artificial methods, because 'goofy-footed' skaters are about common as 'regular-footed'.

The title text describes Hawk as the first person to "land a 900," meaning the successful completion of a {{w|900 (skateboarding)|skateboarding trick}} involving two and a half rotations, or nine hundred degrees (2.5 × 360° = 900°). In physics, {{w|Spin (physics)|spin}} is a {{w|quantum number}} describing subatomic particles, named for the analogous ''but crucially distinct'' concept of {{w|angular momentum}} in classical physics. Obeying {{w|Fermi–Dirac statistics}} requires that the particles involved are {{w|fermion}}s, which include all of the electrons, protons, and neutrons comprising the entirety of Hawk's mass and electrochemical state. Fermions all have {{w|half-integer}} (i.e., ...–1½, –½, ½, 1½...) {{w|spin quantum number}}s which do indeed include 2½. However, it's very important to remember that [https://www.youtube.com/watch?v=pYeRS5a3HbE&ab_channel=ScienceClicEnglish quantum mechanical spin is ''not'' rotation, but how quickly the corresponding particle changes state when rotated.]

While everyone and most everything we ordinarily interact with except light, cosmic rays, and their decay products are comprised entirely of fermions, {{w|Boson#Composite_bosons|any composite particle made of an even number of fermions, including entire atoms and their nuclei, are not fermions}} but {{w|boson}}s, which do ''not'' obey Fermi–Dirac statistics. Luckily, landing a 900 does not actually require complete obedience to Fermi–Dirac statistics, because a skateboarder comprised entirely of bosonic atoms would still have fermionic electrons in the orbitals of those atoms, and thus would still obey the far more macroscopically fundamental {{w|Pauli exclusion principle}}, which gives mostly empty atoms the property of substance, allowing you to hold things, walk, make sound waves with your voice, employ any mechanical property of matter, and allowing a sufficiently skilled skateboarder to land a 900.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Tony Hawk (drawn with short hair) gesturing at a narrow whiteboard on which illegible things are marked, what may be a Feynman diagram with one of the particle/antiparticle pair going into a circle (possibly representing a black hole, and thus depicting the popularized(incorrect) analogy for {{w|Hawking radiation}}), and at the bottom, a 2x3 table of values.]
:Tony Hawk: In the standard model, regular matter will annihilate if it comes in contact with oppositely-charged ''goofy'' matter.

:[Caption below the panel:]
:Tony Hawk becomes a physics professor

{{comic discussion}}

[[Category:Comics featuring real people]]
[[Category:Physics]]
[[Category:Statistics]]

Talk:2964: Olympic Sports

2024-07-27T19:54:38Z

162.158.186.252: comment

What took bro so long
Is he stupid [[Special:Contributions/141.101.98.119|141.101.98.119]] 13:05, 27 July 2024 (UTC)
:Seems totally unclear what you're referring to, here.
:[[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 15:00, 27 July 2024 (UTC)
::i think they're referring to this comic being somewhat late. [[user talk:lettherebedarklight|youtu.be/miLcaqq2Zpk]] 15:07, 27 July 2024 (UTC)
:: The comic appeared around 0800 EDT 20240727 (Saturday, a day late). As most folks here surely know, late posts are common on xkcd but aren't often later than the stated "MWF". After 19 years, and without the "weeks ahead" buffer insisted upon by "traditional" syndicated comics (as shown by [https://xkcd.com/2961/ Crowdstrike], posted the day of the event), I think Randall has done remarkably well. I'd struggle to keep a schedule like this for 19 weeks.[[Special:Contributions/172.71.151.95|172.71.151.95]] 15:34, 27 July 2024 (UTC)

I think "''Synchronized'' Swimming" would be the most hilarious. One person flailing while a whole team tries to make it look choreographed.
[[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 15:00, 27 July 2024 (UTC)
:I picture two people that are synchronized to each other while the third person tries to look choreographed - [[Special:Contributions/162.158.212.172|162.158.212.172]] 15:11, 27 July 2024 (UTC)
:Why must I think of "The fox has left his lair"... [[Special:Contributions/172.71.160.71|172.71.160.71]] 16:39, 27 July 2024 (UTC)

I hear there's an opening on the GB equestrian team. Just sayin'...
[[Special:Contributions/141.101.69.119|141.101.69.119]] 19:15, 27 July 2024 (UTC)

I'm going to disagree about beginning pole vaulters, they're incredibly funny. [[Special:Contributions/162.158.186.252|162.158.186.252]] 19:54, 27 July 2024 (UTC)

2937: Room Code

2024-05-25T08:42:24Z

162.158.186.252: /* Explanation */ lol 2: electric boogaloo

{{comic
| number = 2937
| date = May 24, 2024
| title = Room Code
| image = room_code_2x.png
| imagesize = 650x290px
| noexpand = true
| titletext = Sorry to make you memorize this random string of digits. If it helps, it can also double as a mnemonic for remembering your young relatives' birthdays, if they happened to have been born on February 5th, 2018.
}}

==Explanation==
{{incomplete|Created by a SIX-DIGIT HOTEL ROOM CODE - Please change this comment when editing this page.}}

Cueball and Megan are on vacation or otherwise traveling, and receive a code for their hotel room. Megan gives a seemingly nonsensical and unhelpful {{w|mnemonic}} by which Cueball can remember it... which, inexplicably, actually ''helps'' Cueball to remember the code. Cueball becomes VERY angry on realizing this.

The first three {{w|prime numbers}} are actually 2, 3, and 5. So this technique easily identifies the first two digits "02". "05" is slightly wrong because it's not the second prime number, it's the third. And "18" is more wrong because it's not actually a prime number, it's 2 x 3 x 3.

So the mnemonic itself doesn't really provide the method for remembering the code. Instead, figuring out how to apply the bogus mnemonic will reinforce your memory of the code.

The title text points out that the code is also similar to a date in MMDDYY format, so if you happen to have a relative who was born on February 5, 2018, the memorized code will help you remember this date if using said date format.

==Transcript==
:[Megan is standing next to Cueball, who is holding a phone or a note in his hand. Each one has a suitcase on the out-facing side of them.]
:Cueball: Okay, I need to remember that the room code is 020518.

:[Closeup on Megan who has her palm raised.]
:Megan: Easy -- just memorize it as "the first three prime numbers, if you realized you couldn't remember what came after 2 and started to panic and get them increasingly wrong."

:[Beat panel of Megan and Cueball standing with no border.]

:[Megan and Cueball still standing.]
:Megan: ...Are you mad because that actually works?
:Cueball: '''''Why is memory like this?'''''

{{comic discussion}}

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

2936: Exponential Growth

2024-05-24T17:42:59Z

162.158.186.252: /* Explanation */ Mentioned that Black Hat's pieces could simply be buried

{{comic
| number = 2936
| date = May 22, 2024
| title = Exponential Growth
| image = exponential_growth_2x.png
| imagesize = 545x264px
| noexpand = true
| titletext = Karpov's construction of a series of increasingly large rice cookers led to a protracted deadlock, but exponential growth won in the end.
}}

==Explanation==
{{incomplete|Created by an INFINITELY NESTED SET OF RICE COOKERS - Please change this comment when editing this page.}}

{{w|Exponential growth}} is the principle that if you keep multiplying a number by a value larger than 1, you will pretty quickly get very large numbers. Even if you start with 1 and simply double it each time, you'll have a 10-digit number after about 30 iterations.

This principle is often illustrated using a story that generally follows the narrative of a king of India (or elsewhere) wishing to thank a man for creating the game of {{w|chess}}, or perhaps some other chess-related service, and asked him to name his own reward. The man asks for a single grain of wheat (or, in some versions, rice) to be placed on the first square of a chessboard, and then for each subsequent square adding twice as many grains as the one before, until {{w|Wheat and chessboard problem|all 64 squares are filled}}. The king grants his strange request and immediately orders one wheat grain to be placed on the board, imagining this to be a trivial gift compared to the vast riches he had expected to be asked for. For the second square two more pieces are placed, and the square after has four pieces (the tale may involve waiting a day between each placing of grains, delaying the unravelling and subsequent outcome of the story). However, by the 20th iteration, there are over 500,000 grains on the board and the king has to dig deep into his supply to continue to pay his dues. On the 24th the king finds he owes more than 8 million grains. By the 32nd, the king finds himself owing over 2 billion grains and has to give up, realising the essential impossibility of the task.

In some versions of the story, the man is executed for embarrassing the king/being over-greedy; in others, he's rewarded for his cleverness; in yet others he becomes king himself as a consequence. There are also other versions that [https://www.comedy.co.uk/radio/finnemore_souvenir_programme/episodes/7/5/ subvert the well-known tale] by the king not being so naïve as to fall for the 'trick' played by the creator of the problem.

Since a chessboard contains 64 squares, the final square would contain 263 (approximately 9.2 quintillion) grains. This would be around 600 billion tonnes of wheat (even in modern times, this is more than 750 years of global wheat output). Worse, that's just for the final square – adding up all the squares would require about double that (264-1 which is approximately 18.4 quintillion grains). If Black Hat somehow fit all of them on the board, the density of it would most likely fall into itself with its gravity and turn into a {{w|black hole}}.

Instead of this being a (possibly apocryphal) story, [[Black Hat]] enacts it literally during a game of chess to annoy his opponent into quitting. Black Hat begins describing the metaphor to [[Cueball]], only to reveal it wasn't a metaphor at all. Black Hat had been playing actual chess games, and tried to force his opponent [[Hairy]] to resign by burying the chess pieces in rice.

{{w|Garry Kasparov}} is a world renowned Russian chess master. He had the highest {{w|FIDE}} chess rating in the world - one of 2851 points - until {{w|Magnus Carlsen}} surpassed that in 2013 by 31 points. The [https://www.chess.com/openings/Sicilian-Defense-Taimanov-Szen-Kasparov-Gambit Kasparov gambit] is an opening in chess, a variation of the {{w|Sicilian Defense}}.

In 1984–1985 Garry Kasparov played {{w|Anatoly Karpov}} in a 5-month-long 48-game championship tournament which was abandoned. In these matches Kasparov was losing 4-0 with 6 wins being required to win. Kasparov proceeded to draw 35 times before the match was abandoned. The title text implies that Kasparov actually tried this method on Karpov, who attempted to consume all the rice with "increasingly large rice cookers", but eventually couldn't keep up, causing the game to be abandoned in the 5 month period. While this is obviously fictional, it fits with the principle of exponential growth. If exponential growth is unrestricted, it will eventually grow beyond the constraints of anything that could plausibly be built to contain it.

In a 1985 rematch, Kasparov defeated Karpov for the world championship title, which he retained in their next rematch in 1986.

There are several articles in the International Chess Federation (FIDE)'s [https://www.fide.com/FIDE/handbook/LawsOfChess.pdf Laws of Chess] that might prevent Black Hat from winning in this way:
* 7.3 "If a player displaces one or more pieces, he shall re-establish the correct position (...). The arbiter may penalise the player who displaced the pieces."
* 12.1 "The players shall take no action that will bring the game of chess into disrepute."
* 12.6 "It is forbidden to distract or annoy the opponent in any manner whatsoever. (...)"

In any case, it appears that in his enthusiasm to enact his scheme, Black Hat has neglected to even set up his own pieces (or they have already been completely buried), never mind wait for the game to commence, so his opponent has nothing to resign from - indeed his king still appears to be standing as he walks away.

==Math==

The amount of rice collected on each square of the chess board is listed below. It all sums up to around 400 billion tons (or {{w|tonne}}s, the various distinctions being not so important), taking each grain as weighing approximately 0.02 grams. This is 500 times the annual world production.

The last day, alone, would require 200 billion tons. But the implicit nature of this doubling is that the amount of rice you put on at any stage is exactly equal to the amount of rice already on the board ''plus one extra grain''. So there were around 200 billion tons already, before the last square required a virtually identical additional amount.

* First row:
** a1: 1 grain
** a2: 2 grains
** a3: 4 ...
** a4: 8
** a5: 16
** a6: 32
** a7: 64
** a8: 128
* Second row
** b1: 256
** b2: 512
** b3: 1,024
** b4: 2,048
** b5: 4,096
** b6: 8,192
** b7: 16,384
** b8: 32,768
:
* First of each subsequent row
:
** c1: 65,536 grains (~ 1 kg)
** d1: 16,777,216 (~ 400 kg)
** e1: 4,294,967,296 (~ 100 tons)
** f1: 1,099,511,627,776 (~ 25,000 tons)
** g1: 281,474,976,710,656 (~ 6 million tons)
:
* ...
:
* Eighth row, in detail
** h1: 72,057,594,037,927,936 (~ 1.5 billion tons, more than the 2022 world harvest)
** h2: 144,115,188,075,855,872
** h3: 288,230,376,151,711,744
** h4: 576,460,752,303,423,488
** h5: 1,152,921,504,606,846,976
** h6: 2,305,843,009,213,693,952
** h7: 4,611,686,018,427,387,904
** h8: 9,223,372,036,854,775,808 (~ 200 billion tons)

[https://upload.wikimedia.org/wikipedia/commons/e/e7/Wheat_Chessboard_with_line.svg Example on chessboard (SVG diagram)]

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Black Hat is talking to Cueball standing next to him, arm raised.]
:Black Hat: Exponential growth is very powerful.

:[Closeup on Black Hat. Next to him is an image of the lower left part of a chessboard. The four leftmost squares in the bottom row have grains of rice on them -- one, two, four, and eight grains respectively.]
:Black Hat: A chessboard has 64 squares.
:Black Hat: Say you put one grain of rice on the first square, then two grains on the second, then four, then eight, doubling each time.

:[Black Hat has emptied a bag of rice on a chessboard. There are two additional bags next to him and a pile of rice already on the table. A small pile of rice is growing at Black Hat's feet. A frustrated Hairy is walking away, fists clenched. On Hairy's side of the chessboard there is a white King and Pawn]
:[Caption above panel, representing Black Hat continuing to speak:]
:If you keep this up, your opponent will resign in frustration.
:It's called Kasparov's Grain Gambit. Nearly impossible to counter.

{{comic discussion}}

[[Category:Comics featuring Black Hat]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Chess]]
[[Category:Food]]
[[Category:Comics featuring real people]]