explain xkcd - User contributions [en]

2673: Cursed mRNA Cocktail

2022-09-17T01:49:02Z

172.69.33.199: /* Explanation */ serves 5

{{comic
| number = 2673
| date = September 16, 2022
| title = Cursed mRNA Cocktail
| image = cursed_mrna_cocktail_2x.png
| imagesize = 331x513px
| noexpand = true
| titletext = Serve one each to guests whose last cursed cocktail was more than 2 months ago.
}}

==Explanation==
{{incomplete|Created by a VACCINE DRINKER. Do NOT drink the mRNA Cocktail. Do NOT delete this tag too soon.}}

Approximately two dozenth in [[:Category:Comics featuring cursed items|the "cursed" series]], this comic describes a process to approximate the molecular composition of certain {{w|mRNA}}-based vaccines in drinkable form. It contains the variety and relative concentrations of the simple molecular constituents found within the injectable mixture. i.e. mostly water, some sugar, lipids (and an amino acid "or" biological and genetic material.)

Like much of what we eat or drink, the stomach and intestines will neutralise much of the complexity of either the vaccines or this ersatz replica of them, reducing them to simpler proteins of some slight nutritional value. For the vaccine to work, it has been designed to be injected into the body e.g. {{w|intramuscular}}ly to bypass the hostile environment of the human digestive system. While there are similar vaccines administered as a nasal spray, the fragility of mRNA in the human digestive system has curtailed the search for ingestible analogs. [[Randall]]'s replacement mixture '''might provoke generally unwise physiological reactions.''' While very few people would find such a mixture palatable, it is likely nontoxic,{{Actual citation needed}} and contains water, proteins and calories, all important if elementary nutritional components. Because it doesn't contain a complete spectrum of essential amino acids, vitamins, and minerals,{{Actual citation needed}} you can't live on it alone.

The instruction to serve in {{w|shot glasses}} is a play on words as "shot" can mean {{w|Injection (medicine)|injection}} in medicine. (U.K.: {{wiktionary|jab#Noun|jab}}; Scotland: {{wiktionary|jag#Noun|jag}}). However, one {{w|jigger}} is only 0.19 of a cup, so the recipe serves five.

The title text suggests the mixture can be served as a "booster" to a prior dose or serving after an initial treatment. There is much study of vaccine efficacy relative to the timing of subsequent doses. Too little time between makes the new dose not necessarily cause the immune system to react in the way that it should; however most pairs of distinct vaccines work well if delivered on the same day.{{Actual citation needed}} The comic recommends not redosing within two months of the last attempt.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:Ever wondered what it would be like to drink the new COVID booster?
:This recipe approximately recreates the taste and nutritional profile!
:''(Note: does not protect against COVID.)''

:[The following two testimonies are displayed in spiky bubbles.]
:"...What? Eww." -CDC spokesperson
:"Please stop." -Dr. Anthony Fauci

:Ingredients
:2 cups water
:3 tbsp mayonnaise
:¼ tsp MSG or nutritional yeast
:1 tbsp sugar

:Directions
:Pour 1 cup of water into a blender. Add the mayonnaise and MSG. Blend until smooth.
:Pour the other cup of water into a glass. Add the sugar and 1 tsp of the mixture from the blender. Stir well.
:Serve in shot glasses.

{{comic discussion}}
[[Category:COVID-19]]
[[Category:Biology]]
[[Category:Comics featuring cursed items]]
[[Category:Comics featuring real people]]

2658: Coffee Cup Holes

2022-08-29T22:57:58Z

172.69.33.199: /* Explanation */ this is done

{{comic
| number = 2658
| date = August 12, 2022
| title = Coffee Cup Holes
| image = coffee_cup_holes.png
| titletext = Theoretical physicist: At the Planck length, uncountably many.
}}

==Explanation==
{{incomplete|Created by a CAFFEINE MOLECULE WITH A HOLE DRILLED IN ITS SIDE. Do NOT delete this tag too soon.}}
This comic depicts people in different fields of study answering the question, "How many holes are there in a coffee cup?" and also compares this to what a normal person would say.

This question has different interpretations, entirely dependent upon the definition of a hole. The type of {{w|coffee cup}} shown in the comic is with a handle (like a {{w|mug}}), but [[Randall]] calls it a cup and there are also cups with handles on the Wikipedia page for coffee cups. Most people would recognize that there is a hole through the handle.

The comic explores the answer to the question through several peoples’ avenues of thought:

===Topologist===
[[File:Mug and Torus morph.gif|thumb|200px|The coffee mug and donut shown in this animation both have topological genus one.]]
[[Ponytail]], a {{w|topology|topologist}}, states the coffee cup belongs in the {{w|Genus (mathematics)#Topology|genus}} of one hole. From the topologist's point of view, the coffee cup definitely has one hole, which corresponds to the opening created by the cup handle. A cup without a handle would have zero holes, as it is equivalent to a dinner plate, just an indentation in the surface. See [[2625: Field Topology]] for more information about topology.

The panel as a whole references an academic joke wherein topologists can't tell the difference between a coffee cup with a handle and a {{w|doughnut}} since they're {{w|Homeomorphism|homeomorphic}} to each other — meaning they have the same genus (i.e one hole).

===“Normal” person===
[[Hairy]], representing a "normal person," is not sure (the acronym "IDK" stands for "I don't know") and asks for clarification about whether the opening at the top counts as a hole. This shows flaws in the question, which suffers from the mathematically imprecise, ambiguous common usage of the word "hole." Topologists would refer to the opening as a concavity, not a hole, and while they consider such geometrical properties generally outside their field, most practical applications of topology do involve geometric components. By contrast, in everyday usage many concavities are called holes, such as a hole dug into dirt with a shovel. Hairy would say one for the handle, and two if the opening counts as a hole, which he is not certain the one asking the question thinks.

===Philosopher===
[[Hairbun]], a philosopher, answers the question with an elucidating counter-question, considering a hypothetical scenario. One might expect that drilling a new hole would also increase the number of holes by one. However, as illustrated, some people would consider that the new arrangement has three holes (in addition to the handle, there is a hole at the top where coffee can be poured in, and one at the bottom where it can run out), while others would consider it to have only two (the new hole forming a continuous hole with the original opening at the top, through which coffee can run). Some might in fact say that the coffee cup now has one hole because it is leaky, disregarding the handle topology at this point. In this way she requires her interlocutor to confront the ambiguities and consider what they mean by the word 'hole' in different contexts. An interesting point about Hairbun's response is that she doesn't actually answer the question, a trope often found in philosophical replies.

[[Image:Point cloud torus.gif|thumb|left|200px|A point cloud of a genus one surface]]

===Chemist===
[[Cueball]], a chemist, looks at the coffee in the cup on a molecular level. He envisions a {{w|ball-and-stick model}} of the {{w|caffeine}} molecules in the coffee, and estimates a total number of holes of all the coffee molecules. He comes up with a truly massive number: 1,000,000,000,000,000,000,000 (1021 or 1 sextillion) “in the [https://chemapps.stolaf.edu/jmol/jmol.php?model=CN1C%3DNC2%3DC1C%28%3DO%29N%28C%28%3DO%29N2C%29C caffeine] alone.” One molecule of caffeine has two rings of bonds with holes in them, multiplied by 500 quintillion molecules, or 0.00083 {{w|mole (unit)|moles}}. As the molecular mass of caffeine is about 194 grams per mole, [[Randall]] must think that the mass of caffeine in a typical cup of coffee is 161 milligrams. The coffee could have other holes, depending on the type of coffee; for example, espresso contains significant amounts of niacin and riboflavin, which have one and three rings in their chemical structure, respectively.

This estimation depends on taking the ball-and-stick model of molecules somewhat literally. However, real molecular bonds are not solid sticks, but shared electron clouds between atoms. The "holes" in the middle of a molecule's rings are not completely empty but instead merely have lower electron probability density through the middle than other parts of the bonds. So the point-cloud duality of {{w|Bonding molecular orbital|electron orbitals and bonds}} might not satisfy a topologist's, normal person's, or philosopher's criteria for a connected substrate in which holes may be formed.

===Theoretical physicist===
[[Image:World lines and world sheet.svg|thumb|200px|{{w|String theory}} describes the {{w|worldline}}s of point-like particles as {{w|worldsheet}}s of "closed strings," forming topological holes; shown here as a genus two surface.]]
In the title text, a theoretical physicist looks even deeper, at the subatomic scale of {{w|Planck units}}. Since fundamental particle interaction is governed by fundamental forces and collision (per the {{w|Pauli exclusion principle}}) instead of tensile or ductile solid connectedness, the theoretical physicist posits that any definition providing for a single hole would also describe a number of holes akin to the factorial of the number of particles in the universe,[https://tel.archives-ouvertes.fr/tel-02341882/document] or at least within the cup's {{w|light cone}}, which is a number impractical to accurately count, but not uncountable in a mathematical sense.

=== Practical considerations ===
The main joke is that the number of holes depends on both the scale and perspective from which you are looking at the world. From a topological standpoint, when someone digs into the ground it should go all the way through (or easier, down and up again another place) before it is considered a hole, since a hole is something that some other thing should be able to pass through. But from a common usage perspective, if people dig in the ground the result is called a hole, because functionally it creates a discontinuity in to which, for example, things can be placed or fall. Similarly, the opening in a coffee cup without a handle or a bottle of beer is called a hole, even though they are topologically equivalent to a dinner plate, which normal people would never say had a hole.

A cavity in a surface could also be considered a physical barrier, preventing movement along the surface in certain scenarios (e.g. a {{w|sinkhole}} opening up in the middle of a road) even though it may be topologically 'flat' in the most general way, and so is very open to context, and such a hole might be considered more a 'thing' than the surface that has been removed to create it. And the 'hole' in a vessel that is functionally useful to hold liquid (or the drilled one that removes that ability) is of a different nature to the holes in various of the molecules that ''are'' the liquid but are neither required nor counter-productive in the general liquid-holding capabilities of the container, as are not the holes in the planck-length model, except insofar as the general physical laws of reality. Conversely, this conceptual confusion over what a hole is or actually means can be seen in the idea of the {{w|portable hole}}, which tends to obey ({{w|Wile E. Coyote and the Road Runner|or defy}}!) the owner's particular preconceptions or needs.

The topological discussion here regarding cups and doughnuts is related to the question of how many holes there are in a human, which is excellently answered in Vsauce's video
[https://www.youtube.com/watch?v=egEraZP9yXQ How Many Holes Does a Human Have?]. This also takes a good look at the topological difference between a paper cup and a mug with handle, and how one could be morphed into a plate and the other into a doughnut.

==Transcript==
:[The first panel has text only and is phrasing a question:]
:<big>Q:</big>
:How many holes are there in a coffee cup?

:[Each of the next four panels has a caption at the top to indicate the kind of person answering the question. In the first of these Ponytail stands holding a coffee cup in its handle.]
:Caption: Topologist
:Ponytail: One.

:[In the next panel Hairy stands to the right of Ponytail, holding the coffee cup in its handle at an angle so he can to look into it.]
:Caption: Normal person
:Hairy: IDK, does the opening count as a hole?

:[In the next panel Hairbun is shown in closeup, holding her hand out palm up to indicate two drawings of coffee cups with handles to her left. The top drawing is larger and shows the cup with coffee inside, and a hole drilled at the bottom part of the side away from the handle. Coffee pours out of this hole. Beneath and further left is a smaller version of the same cup, but now without coffee. Instead two curved arrows goes from above to below through the hole of the handle and the hole now drilled in the bottom part of the cup. Each arrow is labeled with a question-mark.]
:Caption: Philosopher
:Hairbun: To answer that question, consider another: If we drill a hole in the side, how many holes are there now?
:?
:?

:[Cueball, without any cup, stands with a drawing of a caffeine molecule above and to the right of him. It has two "rings" with 5 and 6 atoms. Those rings are connected along one side. There are 9 "edges" on this, three of those has one atom attached to it and 3 others have four atoms attached to them (one atom with three others attached). The two that are at the end of the edge that belongs to both rings have no atoms attached, and the final of the 9 also has no atom.]
:Caption: Chemist
:Cueball: 1021 in the caffeine alone

{{comic discussion}}

[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Hairbun]]
[[Category:Comics featuring Cueball]]
[[Category:Food]]
[[Category:Math]]
[[Category:Chemistry]]
[[Category:Philosophy]]
[[Category:Physics]]

2659: Unreliable Connection

2022-08-29T22:54:46Z

172.69.33.199: /* Explanation */ not really items, just labels

{{comic
| number = 2659
| date = August 15, 2022
| title = Unreliable Connection
| image = unreliable_connection.png
| titletext = NEGATIVE REVIEWS MENTION: Unreliable internet. POSITIVE REVIEWS MENTION: Unreliable internet.
}}

==Explanation==
{{incomplete|Created by ROUND TRIP LATENCY BACKOFF. Do NOT delete this tag too soon.}}

In today's world, the Internet, pervasive mobile technology and the COVID pandemic have all caused an implicit expectation for many people to be available all hours of the day, whether for work or social communications, even when on vacation. In this comic, [[Randall]] addresses the issue with a deliberately suboptimal internet device that drops Internet connectivity intermittently and at unpredictable intervals, thereby causing activities that require a constant, uninterrupted connection to be unusable. The device appears to be an internet {{w|modem}} connected to an automated version of a {{w|Galton board}} or {{w|Jin Akiyama}}'s mathematical {{w|pachinko}} machine[https://arxiv.org/pdf/1601.05706.pdf] with a series of twelve switches at the bottom to be pressed by falling balls, eleven of which are linked to a the label "on" and one linked to a second label "off," both such items apparently directly controlling the routing device. This solves the social problem of demands for the likes of {{w|synchronous conferencing|synchronous teleconferencing}}, by causing {{w|Asynchronous communication|asynchronous}} methods of communication to be relatively more reliable and efficient for personal use.

This is funny because such a device could likely much more easily be implemented in the {{w|firmware}} of the internet or WiFi modem or {{w|Router (computing)|router}}s. (See [[1785: Wifi]] for an explanation of firmware.) It's not clear whether the switches merely interrupt the connection momentarily or control power to the modem, which would involve a much longer booting sequence. The "unreliable" connection provides an excuse to be unavailable for work or social calls, and thus free to enjoy one's vacation. However the device also allows the user to have a fast internet connection most of the time, enabling them to use it for leisure purposes, such as downloading movies for entertainment, or to connect with others on one's own terms. It thus retains most of the benefit of a good connection.

The probability of a ball hitting the "off" switch is 165/2048, or about 8% (assuming the machine is ordinary[https://drops.dagstuhl.de/opus/volltexte/2018/8817/pdf/LIPIcs-FUN-2018-26.pdf]) because it's in the ninth position. We don't know the frequency with which new balls are dropped, so we can't estimate the frequency at which the device is likely to trigger {{w|Session Initiation Protocol}}, {{w|Transmission Control Protocol}}, or similar {{w|Timeout (computing)|timeout}} conditions that would likely close synchronous {{w|VOIP}}, video conferencing, and e.g. {{w|VRChat}} connections. Even if such connections were to survive the induced service interruptions, the {{w|application layer}} call or teleconference quality would suffer during them. The device may cause interruptions rarely enough that the connection is usable for casual purposes, but the user can still reasonably claim that it's unreliable to get out of online obligations.

The title text reflects on today's increasingly always-connected world, where emphasis may be changing from finding rare vacation spots that have reliable internet, to now finding somewhere worthwhile to go that still doesn't have it. It could also be a comment on the mild paradox that a nominally unreliable internet connection has advantages for those whose communication schedule, volume, or style preferences make synchronous teleconferencing less practical, desirable, or both. The reviews for the new vacation spot indicate that disconnections are found to be both desirable and undesirable, possibly even by the same person.

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

:[There are twelve switches under an automated Galton board or pachinko machine, eleven of which are linked to a large item marked "on" but the ninth of which is linked to one marked "off", apparently controlling the operation of a modem connected to a gigabit data-cable and also connected onwards to a WiFi router. There is a supply of balls in a hopper above the board, with the triangular configuration of pins directing the balls chaotically to one or other of the switches, as shown by a single released ball and a motion path partially showing how it had rebounded from around half-way down until after hitting and rebounding away off a bottom-layer "on" switch.]

:[Caption below the panel]:
:My new vacation spot has very fast internet that turns off randomly every now and then, just so you can tell people you'll be staying somewhere without a reliable connection.

{{comic discussion}}
[[Category:Internet]]
[[Category:Social interactions]]

Talk:2658: Coffee Cup Holes

2022-08-19T10:33:59Z

172.69.33.199: Reply

I was confused for a moment. That's a coffee ''mug''. And the correct answer is either one (the handle) or none (because below the macroscopic level (and above the theoretical sub-Planck scale of string-theory loops) it's increasingly not even mostly holes but very, very barely anything 'solid' jostling about in empty space giving no real impediment to any theoretical quantum-scale cheesewire without even being cut through). A coffee ''cup'' has no holes (regardless) if you don't count any form of sippy-lid it might have. [[Special:Contributions/172.70.85.13|172.70.85.13]] 22:25, 12 August 2022 (UTC)
:Actually, the mug has two at the macro level (the hole that makes up the handle and the hole on the top). There could conceivably be more shallow holes inside the mug where the handle connects to the cup. At a plank-length level, the atoms could be viewed as holes in the vacuum bending space time around it.
::You're not a topologist, certainly. And a ''hydrogen-nucleus'' is approximately 10^20 times the planck-length. The whole atom on the order of 10,000 times larger, and the constiuent quarks 'only' 1,000th, or so, smaller, with the differences being the space betweenn that anything that cares isn't going to consider much of an obstruction. [[Special:Contributions/172.70.162.155|172.70.162.155]] 23:43, 12 August 2022 (UTC)
:There is no "hole" at the top - at best it count as an indention in the surface {{unsigned ip|172.70.211.134|23:38, 12 August 2022}}
::Hole has multiple meanings. A hole in the ground doesn't have to go all the way through the Earth. The point of panel three is that we don't know what definition the question is using, which makes it impossible to answer correctly.[[User:Zzyzx|Zzyzx]] ([[User talk:Zzyzx|talk]]) 00:47, 13 August 2022 (UTC)
:Do coffee “cups” not have handles wherever you are? Google image search shows white ceramic cups with rounded bottoms, wider than they are high, ''with round handles'' that a finger or two can pass through, on saucers; and that is indeed what I think of when I hear “coffee cup”. [https://en.wikipedia.org/wiki/Coffee_cup Wikipedia] shows similar examples in other colours and materials. In my understanding, it is entirely equivalent to a mug-with-a-handle topologically and has the same one hole. Oh, are you perhaps thinking of those cardboard cups you get from vending machines and cheap coffee shops? I wouldn’t call them “coffee cups” at all; just “paper cups”. [[User:Chortos-2|Chortos-2]] ([[User talk:Chortos-2|talk]]) 13:01, 13 August 2022 (UTC)
::For my part, "wider than tall and rounded (or even very tapered)" is a cup (it cups the liquid), hence "teacup", and they mostly do have handles, whilst the shape held in the comic is a mug for being more a height-dominant cylinder (or close to it). Topologically the same, but distinct in fully-fleshed form (at least for those of either not morphologically distorted towards the other, a tall cup or a wide mug, say).
::A "paper cup that coffee comes in" (or a similar re-usable "cup-for-life") that does not have a handle is, however, always a ''cup'' even if it's taller than wide, for reasons clearly more descriptivist than prescriptivist in origin. There are no "paper mugs", that I'm aware of; I know you have plastic cup-holding things that give you a (re-usable) handle to hold the thing that the cup sits in so that you don't have to grip a thin, fragile and ''very heated'' disposable/vendable cup skin-on-'skin', but that's a holder for a cup and it's still a cup that it holds.
::I have no compunction in calling the comic's container a mug, based entirely upon its appearance, though obviously applying my own cultural/learnt distinctions to this. YMMV. [[Special:Contributions/172.69.79.171|172.69.79.171]] 19:08, 13 August 2022 (UTC)
::In my experience, it's almost never possible to get even a single finger through the handle on one of those cups. So from a finger perspective they have no holes. [[Special:Contributions/172.70.90.223|172.70.90.223]] 10:19, 15 August 2022 (UTC)
:::Where it ''does'' have a hole (rather than be a solid blade with a thick rim for ripping purposes) the intention is clearly to have the skin-on-skin between finger and thumb as a part of the grip-enhancement. As the hand is (ignoring blood vessels in its interior) not topologically a loop yet is touching then that qualifies the loop of plastic (however unnavigable by any whole digit) as a hole through which such contact can be made. Much more so than the fuss with what loops there are in an {{w|Alexander horned sphere}}, certainly.
:::Contact between components ''may'' also count, especially as the typical 'basket' form of such a cup-holder (definite holes) is now part of the cup-assemblage unit leaving no (or even more insignificant) gaps where those holes were in the holder-alone. In which case you would indeed consider the pinched digits to be looped (finger/thumb/inter-digit-'webbing' forming the hole) and then the handle that they loop through to form a must ''in turn'' be a loop to go though the interossic(?)-hole that has a hole. Which may then topologically create a two-domain composite topology (both parts of which are genus-1-ish toroidality) for which I can't currently imagine the terminology. But it'd be interesting to look at the Borromean Rings object and work out what professional topologists think about ''that'' (three loops, none of which are individually linked to any of the other two, but they are inseperable from ''both'' of the other two). ...sorry, just idly musing about that, not sure it's entirely relevent to the coffee-mugs/etc here. ;) [[Special:Contributions/172.70.85.13|172.70.85.13]] 12:23, 15 August 2022 (UTC)
::::That may be the intention, but it's not the reality - to all intents and purposes the handle might as well be a solid blade in most cases. Also, plastic?? Philistine!! [Edit] Wait - I think you're talking about the things for use with coffee shop takeaways? I was responding to the earlier comment about round-bottomed china cups. [[Special:Contributions/172.70.162.77|172.70.162.77]] 12:59, 15 August 2022 (UTC)
:Randall uses Coffe Cup and those type of cups are shown on wikipedia for coffee cups, so we should use coffee cup in the explanation and I have corrected this and just mentions that it is a coffee cup of the Mug type. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:50, 15 August 2022 (UTC)

[https://upload.wikimedia.org/wikipedia/commons/2/26/Mug_and_Torus_morph.gif] [[Special:Contributions/172.70.179.4|172.70.179.4]] 23:54, 12 August 2022 (UTC)

For something to be a hole, you need to consider what is capable of passing through the hole. For instance, a mesh screen might have no holes that my fingers can pass through, but it is full of holes for water or air to pass through. And while atoms might be mostly space, other atoms can't usually just pass through that space, although high-energy particles may. Also, the space can be considered filled with forces, which may act as barriers to certain things. [[Special:Contributions/172.70.130.171|172.70.130.171]] 00:36, 13 August 2022 (UTC)
:Sure, for one definition of “hole.” That’s the whole point of the comic: there are multiple definitions, and no single definition is correct. [[User:Szeth Pancakes|Szeth Pancakes]] ([[User talk:Szeth Pancakes|talk]]) 01:01, 13 August 2022 (UTC)

Is “cup” or “mug” better for the explanation? “Mug” is a better descriptor, but it’s described as “cup” in the comic, so that would be more faithful to what Randall intended. [[User:Szeth Pancakes|Szeth Pancakes]] ([[User talk:Szeth Pancakes|talk]]) 01:25, 13 August 2022 (UTC)
:Coffee Cup in the explanation with mention of Mug. I have done that --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:50, 15 August 2022 (UTC)

Linguist: Zero to Two... mostly. Given linguistic variation and local functional style the object being referred to may not have a closed handle, or any handle at all (Cup vs Mug), and the top may be considered a hole in the common usage. --- [[Special:Contributions/172.69.71.34|172.69.71.34]] 01:33, 13 August 2022 (UTC)
:You've left out the deep dark hole of despair at your existence that's reflected back at you if it's your first coffee of the day. [[Special:Contributions/172.70.90.223|172.70.90.223]] 10:24, 15 August 2022 (UTC)

Part of the joke is that all five methods don't discern between a cup and a mug, the original cliché being that topologists are unusual because they don't. [[Special:Contributions/172.70.211.134|172.70.211.134]] 03:06, 13 August 2022 (UTC)
:All methods dicern and topologist especially notices the difference so this sentence makes no sense --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:50, 15 August 2022 (UTC)

Someone should mention that part of the joke is that when the topologist says it has one hole, they're referring to the hole in the handle, while in the next panel the "normal person" assumes the one hole they mentioned is the opening and questions its validity. [[Special:Contributions/108.162.241.51|108.162.241.51]] 03:25, 13 August 2022 (UTC)
:Has been done --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:50, 15 August 2022 (UTC)

All frames except the first and last depict a mug; a topologist most definitely discerns between a a cup and a mug because they give different answers, the "normal" person is only questioning a specific feature, and the philosopher is clearly considering a mug. If it's part of the joke the only contrast is the question. Seems way too subtle for Mr Munroes normal style. probably just what he is used to calling it. [[Special:Contributions/172.69.69.208|172.69.69.208]] 07:04, 13 August 2022 (UTC)
:Yes it is a coffee cup of the Mug type. A shame he drew it like this because the mug/cup discussion has nothing with the comic to do at all. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:50, 15 August 2022 (UTC)

We have a lot of visual aids for topology in this comic, and none for the article about 2625: Field Topology. That seems backwards to me.[[Special:Contributions/172.69.22.39|172.69.22.39]] 22:47, 13 August 2022 (UTC)
:That's a good point. Please find photos of the various sports fields and edit them to overlay brightly colored and contrastive lines showing where their holes are, link to them on the admin noticeboard, and I'm sure someone will upload and add them. I think they turned off uploads by IPs and new users to discourage troll vandals. [[Special:Contributions/172.69.22.119|172.69.22.119]] 01:07, 14 August 2022 (UTC)

In the physicist paragraph, I put an Actual Citation Needed tag after "factorial of the number of particles in the universe" because, while I see what is being got at, with string theory of force mediation e.g. photons (and gravitons? or Higgs bosons?) it would be really nice to have a reference for that topic. [[Special:Contributions/162.158.166.125|162.158.166.125]] 01:37, 14 August 2022 (UTC)
:Gotchu fam [https://tel.archives-ouvertes.fr/tel-02341882/document] [[Special:Contributions/172.69.134.17|172.69.134.17]] 18:19, 14 August 2022 (UTC)

In LQG, at each instant of time, geometry is concentrated on one dimensional structures, called graphs, which can be arbitrarily complicated. But I don't think this implies uncountable holes?

Look, I know you're all having a super-important topology discussion or whatever you call it, but did you know today is ''Star Trek'' day on [[2636: What If? 2 Countdown]]? [[Special:Contributions/172.69.22.71|172.69.22.71]] 18:27, 14 August 2022 (UTC)

The philosopher may be referencing the following thought experiment: If you add a hole to a balloon, the result is equivalent to a flat disk that has 0 holes. Therefore, a balloon has -1 holes. (See [https://www.youtube.com/watch?v=ymF1bp-qrjU this Stand Up Maths video] for instance.) [[Special:Contributions/172.69.22.145|172.69.22.145]] 18:51, 14 August 2022 (UTC)
:Dear topologists, which interior is the inside of a balloon? {{w|Relative interior}} or one of its see-alsos, or something else? [[Special:Contributions/172.69.33.199|172.69.33.199]] 21:46, 14 August 2022 (UTC)
::IDK - but I do not think so. It is just Randall's way of showing us that on our scale a coffee cup with a handle has exactly one hole. I'm sure he is on the topologist side, but think it is a stupid question to ask regular people. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:50, 15 August 2022 (UTC)
:::IDKE (E=either.) [[Special:Contributions/172.69.33.199|172.69.33.199]] 10:33, 19 August 2022 (UTC)

I think the philosopher explanation is a bit misleading? "Now" refers to the hypothetical scenario in which there is an extra hole. Natural language philosophy is often (always?) ambiguous, but philosophers generally accept that some interpretations are misreadings and apply the principle of charity. They are not known for "gotcha" trick questions. Rather, Hairbun's question is an example of an "intuition pump", a hypothetical scenario intended to test the reader's intuitions with regard to the concept. So in this case, we might expect the reader to answer that there are now n+1 holes, where n = the number of holes before we made a new hole. You could poll people with this question to get data on the popular understanding of "hole" and "cup" as used in everyday language. [[User:Wordnerd|Wordnerd]] ([[User talk:Wordnerd|talk]]) 01:56, 15 August 2022 (UTC)
:Must have been changed since this comment was written... --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:50, 15 August 2022 (UTC)

Coincidentally, a recent survey asked people "how many holes are there in a straw". )Most people were evenly split between 1 and 2.) https://news.yahoo.com/voices-many-holes-straw-answer-095803773.html [[User:Shamino|Shamino]] ([[User talk:Shamino|talk]]) 15:20, 15 August 2022 (UTC)
: Presumably that was a straw poll? [[Special:Contributions/172.70.162.77|172.70.162.77]] 15:37, 15 August 2022 (UTC)
:: How dare you [[Special:Contributions/172.70.85.221|172.70.85.221]] 03:42, 16 August 2022 (UTC)

All this reminds me of the joke of sending the new guy to the stores to fetch a bag of holes. [[Special:Contributions/172.70.85.5|172.70.85.5]] 08:52, 16 August 2022 (UTC)

Talk:2658: Coffee Cup Holes

2022-08-14T21:46:03Z

172.69.33.199: Reply

Talk:2657: Complex Vowels

2022-08-10T23:36:14Z

172.69.33.199: Reply

Spoken symbol bears resemblance to 🜏, https://en.wiktionary.org/wiki/%F0%9F%9C%8F

sscchhwwaa is easy, say it like the x in "fire" and the silent p in "bath"[[Special:Contributions/172.70.85.13|172.70.85.13]] 21:42, 10 August 2022 (UTC)

Ideas: bellows-, reed-, and lucite-based voiced phone production tracts typical in science museums; {{w|diphone}}s as an alternative to phomemes (a diphone is the second half of one phoneme followed by the first half of the next -- NOT two adjacent phomemes as the Wikipedia article claims. Two adjacent phomemes are a biphone, not a diphone); the relationship of the position of the tongue in two dimensional place × closedeness space to the fundamental and second {{w|formant}} frequencies of speech audio; {{w|diphthong}}s; {{w|Mel-frequency cepstrum|cepstral}} representation such as {{w|MFCC|mel-frequency ceptstral coefficients}}; and {{w|Zalgo text}} IPA. [[Special:Contributions/172.70.206.213|172.70.206.213]] 22:41, 10 August 2022 (UTC)

The vowelspace is depicted in two dimensions for convenience, but it has at least three dimensions. Look at the IPA vowel diagram (already added to this page). The third dimension is roundedness.
:Yes, of the lips; apart from the two dimensions (out: place, and up: closedeness) of the tongue. [[Special:Contributions/172.70.206.95|172.70.206.95]] 22:59, 10 August 2022 (UTC)
::Does roundedness also involve the tongue and cheeks to any extent? [[Special:Contributions/172.69.33.199|172.69.33.199]] 23:36, 10 August 2022 (UTC)

[https://core.ac.uk/download/pdf/47086396.pdf] just saying. Also [https://www.sciencedirect.com/science/article/abs/pii/S0095447010000562] by the same author. And [http://jlls.org/index.php/jlls/article/download/3168/947] might work too. [[Special:Contributions/172.70.206.95|172.70.206.95]] 23:10, 10 August 2022 (UTC)

2655: Asking Scientists Questions

2022-08-09T22:20:43Z

172.69.33.199: /* Explanation */

{{comic
| number = 2655
| date = August 5, 2022
| title = Asking Scientists Questions
| image = asking_scientists_questions.png
| titletext = 'Does the substance feel weird to the touch?' is equally likely to get the answers 'Don't be ridiculous, you would never put your hand near a sample. We have safety protocols.' and 'Yeah, and it tastes AWFUL.'
}}

==Explanation==
{{incomplete|Created by a BOT WHO REALLY WANTS TO DO SOMETHING DIFFERENT FOR ONCE - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
Answering the questions in [[Randall]]'s ''[[what if]]'' blog and his books requires a wide variety of scientific expertise, much of which he is unfamiliar with. To make up for this deficiency, Randall (here represented by [[Cueball]]) has to ask other scientists for help, in this comic represented by [[Hairbun]].

Normal people (not from the scientific community) have certain expectations about scientists, as they would any group of people. In the case of scientists, they are often expected to be overly serious, "measuring the marigolds" rather than enjoying the simpler or more subjective things in life. This is reflected in the first panel, where Hairbun gets annoyed by Cueball's "frivolous scenario" and wants to work on formulas instead. This is the scenario one would have expected from the standard assumptions regarding scientists.

In reality, scientists are just like regular people in most respects and this is why Randall, in reality, is more likely to experience something like what is shown in the second panel. Here Hairbun is quite pleased to get "something fun to think about" as part of their work, instead of filling out her grant applications.

Grants are donations of money from private or government organizations specifically aimed to fund scientific experiments and projects; in many fields, they are the most common source of funding, and the vast majority of scientists not directly employed by private industry rely on grants to support their work. These organizations require applicants to provide detailed information on the goal of the project, the methodology, the expected results, the specific uses to which the money will be put, and more. Applying for a grant is thus a lengthy, painstaking process that more often than not results in disappointment since most granting agencies have only enough money to approve a small percentage of applications. It also has little to do directly with the actual science the scientists want to perform. Thus most scientists find it a necessary but time-consuming and unpleasant part of their job, and the one here expresses relief at taking a break from this part of their work.

Hairbun then asks if Cueball would like to fill out grant applications, trying to bribe him with coauthor credit, powerful magnets, and plutonium. Co-authorship on scientific papers helps scientists advance in the "{{w|publish or perish}}" world of academic careers; such co-authorship might be above-board, if Cueball contributed scientific ideas while helping write grant applications, or it might not. Plutonium is used in making atomic bombs and is thus a tightly controlled substance, as well as being {{w|Plutonium#Toxicity|highly toxic}} due to both its radioactivity and its heavy metal poison effects. The scientist is so relieved to have found someone who might take over filling out grant applications that they are willing to give them access to such a dangerous material without even knowing their name.

The title text notes that not all responses were complaints about grant applications, noting two kinds of answers to the question "Does the substance feel weird to the touch?" which Randall claims are equally common. The first is the sort of response you would expect from a stereotypical scientist, just noting safety procedures that are common with such a substance and how they would impede attempts to determine how weird a substance feels. The second is "Yeah, and it tastes AWFUL," implying that the scientist in question has not only touched the weird substance, but also tasted it. It could have been carelessness of some kind, perhaps having touched their mouth after handling a sample, but it might have been from deliberately licking it or even putting it in their mouth. Whatever the reason they tasted it, they are enthusiastically volunteering this elaboration without any actual prompting.

Eating a bizarre substance is likely a bad idea,{{Citation needed}} as it could be poisonous. Less toxic minerals such as halite are sometimes [http://www.galleries.com/minerals/property/taste.htm evaluated based on taste] as an informal test of their composition; nearly every mineral of low toxicity (and some otherwise) has been tasted for science. However, this is self-evidently a bad idea if you're not sure whether a mineral is a non-toxic one or a similar-looking toxic mineral; mineral taste-tests should only be performed by experts who know they're not eating arsenic or stibnite.

==Transcript==
:[There is a light gray caption written above two normal text captions that are above two panels:]
:For the last few years, I've been working on answering peoples' ridiculous questions for ''What If? 2'', which sometimes meant asking scientists for help.

:[Caption above the left panel:]
:How you'd expect scientists to respond to ridiculous questions:

:[Cueball, representing Randall, stands holding a pad and pencil in front of a desk. There are a stack of three books and some papers on the desk. Hairbun is sitting on an office chair behind the desk. She is pointing at Cueball.]
:Hairbun: Why would you present me with this frivolous scenario?
:Hairbun: Such an absurd query can serve no practical purpose.
:Hairbun: Now go; you distract me from my formulas.

:[Caption above the right panel:]
:How they actually respond:

:[Same setting as in the left panel but the items on the desk have changed, so there are now a laptop computer and a stack with a book and some papers on the desk. Hairbun is sitting on an office chair behind the desk. She is holding another stack of papers up in both hands.]
:Hairbun: Oh thank God, something fun to think about that's not grant applications.
:Hairbun: Hey, do '''''you''''' want to fill out some grant applications? I'll give you literally anything. Coauthor credit. Powerful magnets. Do you want plutonium? I can get you plutonium.
:Hairbun: What was your name again?

:[Light gray caption below the panels:]
:To see the answers I found, preorder at xkcd.com/whatif2 (out 9/13)

{{comic discussion}}

[[Category:Book promotion]]
[[Category:Comics featuring Randall Munroe]]
[[Category:Comics featuring Hairbun]]
[[Category:Science]]

2652: Proxy Variable

2022-07-30T16:42:29Z

172.69.33.199: /* Explanation */ this sentence is almost certainly true, but we need better examples than those on 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.
}}

__NOTOC__

==Explanation==
{{incomplete|Created by a PROXY BOT IN NO WAY RELATED WITH THE ORIGINAL BOT, SO MARRIAGE WOULD BE ETHICALLY AND LEGALLY ACCEPTABLE - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

In this comic, [[Hairy]] is discussing use of a proxy variable with [[Cueball]]. In statistics, a {{w|proxy variable}} is used as a stand-in for one or more other variables that are difficult to measure. In order to be useful as such, proxy variables must be correlated with what they are intended to represent. For example, a drug might aim to reduce deaths from a slow-acting disease. But testing if it reduces deaths might take many years, so researchers might test for a proxy outcome instead, like whether it does not result in loss of bone density or damage to cells. Physicians use blood pressure as one of many proxies of cardiovascular health.

Proxy variables are of interest to non-scientists as they provide a scientific way to indirectly monitor or improve the complex systems that affect their lives.{{Actual citation needed}}

Hairy is dismissing the question of whether they are studying the right variable as too expensive to answer. This is deeply ironic and thus satirical, because good {{w|experiment design}} requires sufficient attention to the robustness of all the involved parts of an experiment, even if the expense may be prohibitive.

Choosing the wrong proxy variable might make the research misleading, irrelevant, or as the title text suggests, answer the wrong question. Separating correlation from {{w|Causality|causation}} is necessary when interpreting proxy variable results to make sure the question they answer is known. Mere correlation instead of {{w|Causal analysis|authentic causation}} yields weaker results. {{w|Exploratory causal analysis}} can assist with finding useful proxy variables, but is difficult for the layperson to interpret, and can be misleading.

The title text's notion of having an answer without knowing the actual question could be be a reference to the classic comedy science fiction novel {{w|The Hitchhiker's Guide to the Galaxy|The Hitchhiker's Guide to the Galaxy}}, where in one scene Earth turns out to be a supercomputer built for the purpose of figuring out the question for the answer "42."

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

:[Hairy uses a pointer to show Cueball a poster of a line chart above a candlestick chart. The drawing appears to show a time series with a question mark for future extrapolation, and a box-and-whiskers plot comparing two variables.]
:Hairy: We want to study this variable, but it's too hard to observe.

:[Cut the panel in half so you can only see Hairy and the poster.]
:Hairy: So we're studying this proxy variable.

:[Cueball and Hairy are standing with the poster out of frame.]
:Cueball: Is it correlated with the other variable?
:Hairy: Look, we don't have the funding to answer every little question.

{{comic discussion}}

2652: Proxy Variable

2022-07-30T04:57:33Z

172.69.33.199: /* Explanation */ copyedit

Talk:2652: Proxy Variable

2022-07-30T04:10:25Z

172.69.33.199: Move header

Maybe Randall is commenting on this recent article [https://www.nature.com/articles/s43588-022-00281-6 Nature Computational Science: Automated discovery of fundamental variables hidden in experimental data]?
02:10, 30 July 2022 (UTC)
suggested by a proxy editor

== this dude keeps spamming ==

Sorry for the mild crassness, especially as a new user, but some Nazi f*ck is vandalizing the page. May someone please ban them?

Nah, they're using multiple IPs. Someone could semi-protect it or something but there ain't any mods doing their job it seems.

Where are the mods, anyways?

:You can't always count on volunteer authorities. Even us lowly IP address editors can revert vandalism. [[Special:Contributions/172.69.33.199|172.69.33.199]] 04:09, 30 July 2022 (UTC)

Article has been restored but some idiots keep spamming the page with random things. pls do something mods

Talk:2652: Proxy Variable

2022-07-30T04:09:04Z

172.69.33.199: Reply

Maybe Randall is commenting on this recent article [https://www.nature.com/articles/s43588-022-00281-6 Nature Computational Science: Automated discovery of fundamental variables hidden in experimental data]?
02:10, 30 July 2022 (UTC)
suggested by a proxy editor

Sorry for the mild crassness, especially as a new user, but some Nazi f*ck is vandalizing the page. May someone please ban them?

Nah, they're using multiple IPs. Someone could semi-protect it or something but there ain't any mods doing their job it seems.

Where are the mods, anyways?

:You can't always count on volunteer authorities. Even us lowly IP address editors can revert vandalism. [[Special:Contributions/172.69.33.199|172.69.33.199]] 04:09, 30 July 2022 (UTC)

== this dude keeps spamming ==

Article has been restored but some idiots keep spamming the page with random things. pls do something mods

2652: Proxy Variable

2022-07-30T04:06:04Z

172.69.33.199: reword

2651: Air Gap

2022-07-29T23:01:50Z

172.69.33.199: /* How this could have a theoretical benefit */ template

{{comic
| number = 2651
| date = July 27, 2022
| title = Air Gap
| image = air_gap.png
| titletext = You can still do powerline networking, but the bitrate does drop a little depending on the lightbulb warmup and cooldown delay.
}}

==Explanation==
{{incomplete|Created by an AIR GAP-PROTECTED BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
This is another one of [[Randall|Randall's]] [[:Category:Tips|Tips]], this time an Energy Tip.

The comic conflates the concepts of computer network security and home electrical power safety to comical effect, resulting in a deeply impractical and ineffective proposed solution. In {{w|computer security}}, {{w|Air_gap_(networking)|air-gapping}} is a measure used to secure sensitive computers or networks of computers by isolating them from the broader internet, since computers are often breached through the internet.

[[Randall]] suggests increasing the security of your home power supply by air-gapping it, using the light from a powered lightbulb to power a solar panel which then supplies power to the home, such that there is no physical wired connection between your house and the public electricity network. This is a large and very inefficient version of an {{w|opto-isolator}}, but would protect equipment behind the solar panel from power surges such as lightning strikes (which in an improperly {{w|Ground (electricity)|grounded}} home could blow out the light bulb, but not so easily risk frying the equipment beyond the photovoltaic cell and its inverter). Due to its inefficiency, this approach would waste substantial amounts of energy.

The title text mentions that a computer can still be connected to the internet via the power supply by using {{w|powerline networking}}, but that the bandwidth would be reduced by the lightbulb's warmup and cooldown delay, which would reduce the signalling rate the lightbulb could accomplish to no more than hundreds of bits per second, if that, for incandescent bulbs. However, as the solar panel cannot emit signals, the unidirectional link would be useless for traditional networking, because essential requests and acknowledgments would be unable to travel from behind the solar panel to the lightbulb. Early {{w|communication satellite}} systems for data networking used high-bandwidth unidirectional {{w|downlink}}s paired with low bandwidth ground telephone lines for outbound transmission, but such network configurations remain very uncommon.{{cn}}

Randall's solution is of course a joke. But in reality he could have used {{w|isolation transformer}}s, which serve to allow the transfer of power via changing {{w|electromagnetic field}}s without an electrically conductive path. Most transformers, including "wall wart" power adapters, provide this form of isolation and protect devices from noise, voltage transients, most surges, and shock hazard, using fuses and other circuitry. They also limit powerline networking bandwidth by filtering out high frequencies.

The look and subject of this comic is reminiscent of the [[:Category:Cursed Connectors|Cursed Connectors]] series. But without the numbered cursed connector in the comic, this is not one of those connectors.

===Why this would be inefficient and impractical===
* Even energy-efficient LED lightbulbs are only about 35% efficient at turning electricity into light, with the rest emitted as heat.
* The air gap is inefficient at passing light from the bulb to the panel, causing some of the light from the lightbulb to be lost to places other than the solar panel, such as to the eye of the observer. A rough guess might be that in the configuration shown less than 60% of light produced will reach the panel, even assuming a perfect reflector.
* Solar panels are generally around 20% efficient at converting light into electricity, with claims at the world record from a single light source at around 40%.

All these efficiency-reducing factors, and others, multiply together. Therefore, only a small fraction of energy would be transmitted between the two ends of the air gap, making the circuit require much more electricity and be much less cost-efficient. For instance, the generous assumptions above lead to 96% of the power being lost.

The solution as illustrated shows a single apparently-normal lightbulb, the highest-powered of which usually draw under 250 watts of power. Given the above efficiency issues, it would provide less than a tenth as much power.

===How this could have a theoretical benefit===
* There are exotic situations where malware on a computer should not be able to communicate with the outside world. Electricity usage is a simple-to-use side channel which would be made much less practical by such a contraption. The power draw of the lamp would be independent of the power consumption of the device.{{Actual citation needed}}

==Transcript==
:[A solar panel and a lamp are pictured together, with the lamp pointed at the solar panel, and electronic equipment connected to the solar panel. Lines point outward from the bulb, indicating that it is shining.]
:[Caption below the panel]
:Energy tip: Increase the security of your home power supply by installing an air gap.

{{comic discussion}}

[[Category:Tips]]
[[Category:Computer security]]

2651: Air Gap

2022-07-29T23:01:28Z

172.69.33.199: /* How this could have a theoretical benefit */ ?

{{comic
| number = 2651
| date = July 27, 2022
| title = Air Gap
| image = air_gap.png
| titletext = You can still do powerline networking, but the bitrate does drop a little depending on the lightbulb warmup and cooldown delay.
}}

==Explanation==
{{incomplete|Created by an AIR GAP-PROTECTED BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
This is another one of [[Randall|Randall's]] [[:Category:Tips|Tips]], this time an Energy Tip.

The comic conflates the concepts of computer network security and home electrical power safety to comical effect, resulting in a deeply impractical and ineffective proposed solution. In {{w|computer security}}, {{w|Air_gap_(networking)|air-gapping}} is a measure used to secure sensitive computers or networks of computers by isolating them from the broader internet, since computers are often breached through the internet.

[[Randall]] suggests increasing the security of your home power supply by air-gapping it, using the light from a powered lightbulb to power a solar panel which then supplies power to the home, such that there is no physical wired connection between your house and the public electricity network. This is a large and very inefficient version of an {{w|opto-isolator}}, but would protect equipment behind the solar panel from power surges such as lightning strikes (which in an improperly {{w|Ground (electricity)|grounded}} home could blow out the light bulb, but not so easily risk frying the equipment beyond the photovoltaic cell and its inverter). Due to its inefficiency, this approach would waste substantial amounts of energy.

The title text mentions that a computer can still be connected to the internet via the power supply by using {{w|powerline networking}}, but that the bandwidth would be reduced by the lightbulb's warmup and cooldown delay, which would reduce the signalling rate the lightbulb could accomplish to no more than hundreds of bits per second, if that, for incandescent bulbs. However, as the solar panel cannot emit signals, the unidirectional link would be useless for traditional networking, because essential requests and acknowledgments would be unable to travel from behind the solar panel to the lightbulb. Early {{w|communication satellite}} systems for data networking used high-bandwidth unidirectional {{w|downlink}}s paired with low bandwidth ground telephone lines for outbound transmission, but such network configurations remain very uncommon.{{cn}}

Randall's solution is of course a joke. But in reality he could have used {{w|isolation transformer}}s, which serve to allow the transfer of power via changing {{w|electromagnetic field}}s without an electrically conductive path. Most transformers, including "wall wart" power adapters, provide this form of isolation and protect devices from noise, voltage transients, most surges, and shock hazard, using fuses and other circuitry. They also limit powerline networking bandwidth by filtering out high frequencies.

The look and subject of this comic is reminiscent of the [[:Category:Cursed Connectors|Cursed Connectors]] series. But without the numbered cursed connector in the comic, this is not one of those connectors.

===Why this would be inefficient and impractical===
* Even energy-efficient LED lightbulbs are only about 35% efficient at turning electricity into light, with the rest emitted as heat.
* The air gap is inefficient at passing light from the bulb to the panel, causing some of the light from the lightbulb to be lost to places other than the solar panel, such as to the eye of the observer. A rough guess might be that in the configuration shown less than 60% of light produced will reach the panel, even assuming a perfect reflector.
* Solar panels are generally around 20% efficient at converting light into electricity, with claims at the world record from a single light source at around 40%.

All these efficiency-reducing factors, and others, multiply together. Therefore, only a small fraction of energy would be transmitted between the two ends of the air gap, making the circuit require much more electricity and be much less cost-efficient. For instance, the generous assumptions above lead to 96% of the power being lost.

The solution as illustrated shows a single apparently-normal lightbulb, the highest-powered of which usually draw under 250 watts of power. Given the above efficiency issues, it would provide less than a tenth as much power.

===How this could have a theoretical benefit===
* There are exotic situations where malware on a computer should not be able to communicate with the outside world. Electricity usage is a simple-to-use side channel which would be made much less practical by such a contraption. The power draw of the lamp would be independent of the power consumption of the device.{{actual citation needed}}

==Transcript==
:[A solar panel and a lamp are pictured together, with the lamp pointed at the solar panel, and electronic equipment connected to the solar panel. Lines point outward from the bulb, indicating that it is shining.]
:[Caption below the panel]
:Energy tip: Increase the security of your home power supply by installing an air gap.

{{comic discussion}}

[[Category:Tips]]
[[Category:Computer security]]

Talk:2651: Air Gap

2022-07-29T22:57:59Z

172.69.33.199: Cleanup

Worth noting that this is a large and inefficient version of an [https://en.wikipedia.org/wiki/Opto-isolator opto-isolator] [[Special:Contributions/108.162.221.79|108.162.221.79]] 05:37, 28 July 2022 (UTC)

: Incandescent light bulb (assuming it the lamp does not use LED in the shape of light bulb) is not only less efficient than diode, but also much slower to warm up and cool down - it usually is much more sensitive to rapid switching, and has shorter life counted in the number of on/off cycles. --[[User:JakubNarebski|JakubNarebski]] ([[User talk:JakubNarebski|talk]]) 07:45, 28 July 2022 (UTC)
:: There’s not even any indication that the bulb is shaped like an incandescent bulb. Only that the front of the light (either fixture or bulb) is a convex curve. For all we know that could be a lens or diffuser in front of a flat LED. Whoever wrote that needs to go back and walk, because the claim that an incandescent bulb is depicted is quite simply false.[[Special:Contributions/172.71.142.89|172.71.142.89]] 10:35, 28 July 2022 (UTC)
::: The warmup and cooldown delays mentioned in the title text must imply an incandescent bulb, mustn't they? [[Special:Contributions/172.70.210.145|172.70.210.145]] 03:29, 29 July 2022 (UTC)

: I don't think it's less or more efficient than an opto-isolator, it essentially ''is'' just an opto-isolator. But an opto-isolator isn't supposed to be energy efficient to begin with; it's only designed to transmit data between circuits, not power. So the output side only needs to generate enough voltage/current to change the state of a transistor, and the input side only needs to generate enough light for the output side to do that. The voltages and currents involved aren't comparable to power circuits. --[[User:NeatNit|NeatNit]] ([[User talk:NeatNit|talk]]) 08:14, 28 July 2022 (UTC)

: By the way, wikipedia links can be written like this: <code><nowiki>[[wikipedia:opto-isolator|]]</nowiki></code> result: [[wikipedia:opto-isolator|opto-isolator]] (the final <code>|</code> automatically gets expanded to the article title without the <code>wikipedia:</code> prefix). --[[User:NeatNit|NeatNit]] ([[User talk:NeatNit|talk]]) 08:26, 28 July 2022 (UTC)
::Or more often here on ExplainXkcd, <code><nowiki>{{w|article}}</nowiki></code> or <code><nowiki>{{w|article|anchor text}}</nowiki></code>. [[Special:Contributions/172.70.206.213|172.70.206.213]] 08:35, 28 July 2022 (UTC)

::: Yes, thanks :) although there is a tiiiiiny advantage to the direct link without the template (the way I said), <code><nowiki>[[wikipedia:Pipe (computing)|]]</nowiki></code> becomes [[wikipedia:Pipe (computing)|Pipe]] whereas <code><nowiki>{{w|Pipe (computing)}}</nowiki></code> becomes {{w|Pipe (computing)}}. The pipe trick strips out the disambiguation parts of the title according to [[Wikipedia:Help:Pipe trick|some rules]]. --[[User:NeatNit|NeatNit]] ([[User talk:NeatNit|talk]]) 12:30, 28 July 2022 (UTC)
:::: Why not <code><nowiki>{{w|Pipe (computing)|pipe}}</nowiki></code>? [[Special:Contributions/172.70.214.95|172.70.214.95]] 15:18, 28 July 2022 (UTC)
:::::Yes we always use the <code><nowiki>{{w|xkcd|xkcd comic}}</nowiki></code> format here on explain to make {{w|xkcd|xkcd comic}} these links. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 09:16, 29 July 2022 (UTC)

It is missing that air-gapping the power supply would protect your home from voltage surges in the power network caused by lightning strikes. Depending where the lightning hits the power network, there may be no fuses protecting your home or single fuses may fail to protect you. --[[Special:Contributions/172.70.246.115|172.70.246.115]] 07:57, 28 July 2022 (UTC)
:That is true. But the suggestion that this might have anything to do with general energy security (as is currently very prominent in the explanation) is entirely unconvincing to me.
::I also originally thought this was the main joke, until seeing the title text about bit rate. Certainly it's worth mentioning, even if this isn't the main joke, since it would actually work, with a wide enough gap, ideally with a vacuum in between.

Incandescent light bulbs convert most of their energy to infrared light. There are solar cells that work in this infrared spectrum, so this might not be all that inefficient as stated. This should in fact be a lot more efficient than any LED+visible spectrum based panel, as incandescent bulbs are very efficient in converting electricity into infrared light, much more than LEDs most likely will ever be.
The (mostly) omnidirectionality of the light source might be an even bigger loss, as most of the light (however efficient) does not even reach the panel.
And regarding sending data over this construct: As soon as there's a 0V state (which will be the case as soon as the transmission starts, due to some form of manchester coding, regardless of it being a 0 or 1 bit) the PC behind the solar panel would not only have a data transmission problem :)
(With incandescent bulb, that is. A LED 0V might be short enough for capacitors in the PC's power supply to buffer it, if it is only at 50%(+PSU conversion loss) load max, as manchester coded signals per definition have a duty cycle of 50% to keep the DC bias at 0V)
[[Special:Contributions/172.68.51.204|172.68.51.204]] 08:26, 28 July 2022 (UTC)

What is the highest wattage commercial opto-isolator, and how can I get one mounted from the ceiling in my bedroom? [[Special:Contributions/172.70.207.8|172.70.207.8]] 14:10, 28 July 2022 (UTC)

I wonder if it's worth noting the significant understatement within the title text, where it says "the bitrate does drop a little" in contrast to the severe and drastic drop in bitrate that would actually occur, especially in light of today's typical Internet speeds. It might not be worth mentioning, but it struck me as a humorous understatement of the true impact. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 14:25, 28 July 2022 (UTC)
:We don't know if the light bulb is incandescent or LED, so we can't describe the bandwidth drop other than in very general terms. [[Special:Contributions/172.70.211.88|172.70.211.88]] 15:34, 28 July 2022 (UTC)
:: It's safe to say the warmup and cooldown delays mentioned in the title text imply an incandescent bulb. Is there a standard or average response time for household bulb incandescent filaments? [[Special:Contributions/172.70.214.43|172.70.214.43]] 03:33, 29 July 2022 (UTC)
::: Maybe this helps? https://ieeexplore.ieee.org/abstract/document/5625426 [[Special:Contributions/172.70.142.21|172.70.142.21]] 06:51, 29 July 2022 (UTC)
:::: Yes! [https://tigerprints.clemson.edu/cgi/viewcontent.cgi?article=1961&context=all_theses Figure 1.10 seems to suggest that frequencies above 10 Hz are filtered,] and that seems consistent with Figure 3.14, in that recovery time is a tenth of a second (though drop-off "cooldown" time is much shorter.) So if I remember my {{w|Binary Golay code|modem math,}} even with the most sophisticated coding, anything more than 640 bits per second should be impossible. [[Special:Contributions/172.69.33.225|172.69.33.225]] 07:39, 29 July 2022 (UTC)
::::: 640 bits per second should be enough for anyone. But seriously, Fig. 1.10 shows a fall-off, not a sharp peak. How do you know there isn't an 8,192-dimensional analog to the {{w|Leech lattice}} which would allow kbps? [[Special:Contributions/172.69.33.199|172.69.33.199]] 22:56, 29 July 2022 (UTC)

I'm almost tempted to suggest that this should be an (honourary) addition to the Cursed Connectors comic-collection. [[Special:Contributions/172.71.94.187|172.71.94.187]] 14:56, 28 July 2022 (UTC)
:I agree that it reminds me of some of those. But it could never be added to the category, as it misses the cursed connector name and number. But I have added a mention of the similarity here above, and also mentioned it on the [[:Category:Cursed Connectors]] page. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 09:22, 29 July 2022 (UTC)
:It's a cursed ''dis''connector. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 15:24, 29 July 2022 (UTC)
::{{w|Dis (Divine Comedy)|Dis}}-connectors are always cursed! ;) [[Special:Contributions/162.158.159.95|162.158.159.95]] 17:11, 29 July 2022 (UTC)

Yes, solar panels can transform electrical into electromagnetic signals. It is more on the side of the incandescent bulb that the capability to receive and forward these signals is missing. My source: https://www.youtube.com/watch?v=TGUteH93xNo
[[User:Torge|Torge]] ([[User talk:Torge|talk]]) 15:11, 28 July 2022 (UTC)
: Interesting! [[Special:Contributions/172.70.142.21|172.70.142.21]] 06:51, 29 July 2022 (UTC)

Nobody caught on that powerline networking is about sending data through powerlines? or that a crude opto-isolation setup could effectively scrub it? Where my networking geeks at? I am disappoint [[Special:Contributions/172.69.71.51|172.69.71.51]] 15:19, 28 July 2022 (UTC)

An electrical engineer here: perhaps we should mention that the box pictured after the solar panel must be an inverter? The lightbulb/solar panel pair will be acting as a rectifier, putting out purely positive voltage, and to get back to AC to run appliances on there would need to be an inverter.
[[Special:Contributions/172.69.62.49|172.69.62.49]] 01:10, 29 July 2022 (UTC)
:Can you please help out with the argument about rectifier efficiency at [[2642]]? [[Special:Contributions/172.70.214.95|172.70.214.95]] 03:24, 29 July 2022 (UTC)

Most of the bulbs in my house (before compact flourescent and LED) were 75 Watt or 100 Watt. 50 Watt would be a very dim bulb.
: Mice wouldn't agree. [[Special:Contributions/172.70.214.43|172.70.214.43]] 05:05, 29 July 2022 (UTC)
::In Denmark 60 Watt was standard, with 100 and 150 possible in some lamps. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 09:22, 29 July 2022 (UTC)

There are actually usecases for optical power links. For example electric field probes use this: https://www.raditeq.com/products/electric-field-probes/
--[[User:Casandro|Casandro]] ([[User talk:Casandro|talk]]) 08:10, 29 July 2022 (UTC)
:Some drones can be recharged in the air by lasers, but that's a really obscure application only the military needs, and then only as a contingency backup in most cases, but there were flying demos by companies interested in the space over the past decade. [[Special:Contributions/172.70.211.88|172.70.211.88]] 22:09, 29 July 2022 (UTC)

I think it might be possible to construct a scenario where this could have some security benefit, albeit not one that justifies such poor efficiency. Suppose you have an embedded system running off USB power to perform some cryptographic task, but the USB port the cable's plugged into is under the control of an attacker who has it instrumented to sample the power consumption at a high frequency. He can perform {{w|power_analysis}} if the load changes based on the operations performed by your device, but the setup in the comic should prevent information from leaking upstream in this manner. [[User:D5xtgr|D5xtgr]] ([[User talk:D5xtgr|talk]]) 19:44, 29 July 2022 (UTC)

Talk:2651: Air Gap

2022-07-29T22:56:25Z

172.69.33.199: Higher filament bandwidth

Worth noting that this is a large and inefficient version of an [https://en.wikipedia.org/wiki/Opto-isolator opto-isolator] [[Special:Contributions/108.162.221.79|108.162.221.79]] 05:37, 28 July 2022 (UTC)

: Incandescent light bulb (assuming it the lamp does not use LED in the shape of light bulb) is not only less efficient than diode, but also much slower to warm up and cool down - it usually is much more sensitive to rapid switching, and has shorter life counted in the number of on/off cycles. --[[User:JakubNarebski|JakubNarebski]] ([[User talk:JakubNarebski|talk]]) 07:45, 28 July 2022 (UTC)
:: There’s not even any indication that the bulb is shaped like an incandescent bulb. Only that the front of the light (either fixture or bulb) is a convex curve. For all we know that could be a lens or diffuser in front of a flat LED. Whoever wrote that needs to go back and walk, because the claim that an incandescent bulb is depicted is quite simply false.[[Special:Contributions/172.71.142.89|172.71.142.89]] 10:35, 28 July 2022 (UTC)
::: The warmup and cooldown delays mentioned in the title text must imply an incandescent bulb, mustn't they? [[Special:Contributions/172.70.210.145|172.70.210.145]] 03:29, 29 July 2022 (UTC)

: I don't think it's less or more efficient than an opto-isolator, it essentially ''is'' just an opto-isolator. But an opto-isolator isn't supposed to be energy efficient to begin with; it's only designed to transmit data between circuits, not power. So the output side only needs to generate enough voltage/current to change the state of a transistor, and the input side only needs to generate enough light for the output side to do that. The voltages and currents involved aren't comparable to power circuits. --[[User:NeatNit|NeatNit]] ([[User talk:NeatNit|talk]]) 08:14, 28 July 2022 (UTC)

: By the way, wikipedia links can be written like this: <code><nowiki>[[wikipedia:opto-isolator|]]</nowiki></code> result: [[wikipedia:opto-isolator|opto-isolator]] (the final <code>|</code> automatically gets expanded to the article title without the <code>wikipedia:</code> prefix). --[[User:NeatNit|NeatNit]] ([[User talk:NeatNit|talk]]) 08:26, 28 July 2022 (UTC)
::Or more often here on ExplainXkcd, <code><nowiki>{{w|article}}</nowiki></code> or <code><nowiki>{{w|article|anchor text}}</nowiki></code>. [[Special:Contributions/172.70.206.213|172.70.206.213]] 08:35, 28 July 2022 (UTC)

::: Yes, thanks :) although there is a tiiiiiny advantage to the direct link without the template (the way I said), <code><nowiki>[[wikipedia:Pipe (computing)|]]</nowiki></code> becomes [[wikipedia:Pipe (computing)|Pipe]] whereas <code><nowiki>{{w|Pipe (computing)}}</nowiki></code> becomes {{w|Pipe (computing)}}. The pipe trick strips out the disambiguation parts of the title according to [[Wikipedia:Help:Pipe trick|some rules]]. --[[User:NeatNit|NeatNit]] ([[User talk:NeatNit|talk]]) 12:30, 28 July 2022 (UTC)
:::: Why not <code><nowiki>{{w|Pipe (computing)|pipe}}</nowiki></code>? [[Special:Contributions/172.70.214.95|172.70.214.95]] 15:18, 28 July 2022 (UTC)
:::::Yes we always use the <code><nowiki>{{w|xkcd|xkcd comic}}</nowiki></code> format here on explain to make {{w|xkcd|xkcd comic}} these links. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 09:16, 29 July 2022 (UTC)

It is missing that air-gapping the power supply would protect your home from voltage surges in the power network caused by lightning strikes. Depending where the lightning hits the power network, there may be no fuses protecting your home or single fuses may fail to protect you. --[[Special:Contributions/172.70.246.115|172.70.246.115]] 07:57, 28 July 2022 (UTC)
:That is true. But the suggestion that this might have anything to do with general energy security (as is currently very prominent in the explanation) is entirely unconvincing to me.
::I also originally thought this was the main joke, until seeing the title text about bit rate. Certainly it's worth mentioning, even if this isn't the main joke, since it would actually work, with a wide enough gap, ideally with a vacuum in between.

Incandescent light bulbs convert most of their energy to infrared light. There are solar cells that work in this infrared spectrum, so this might not be all that inefficient as stated. This should in fact be a lot more efficient than any LED+visible spectrum based panel, as incandescent bulbs are very efficient in converting electricity into infrared light, much more than LEDs most likely will ever be.
The (mostly) omnidirectionality of the light source might be an even bigger loss, as most of the light (however efficient) does not even reach the panel.
And regarding sending data over this construct: As soon as there's a 0V state (which will be the case as soon as the transmission starts, due to some form of manchester coding, regardless of it being a 0 or 1 bit) the PC behind the solar panel would not only have a data transmission problem :)
(With incandescent bulb, that is. A LED 0V might be short enough for capacitors in the PC's power supply to buffer it, if it is only at 50%(+PSU conversion loss) load max, as manchester coded signals per definition have a duty cycle of 50% to keep the DC bias at 0V)
[[Special:Contributions/172.68.51.204|172.68.51.204]] 08:26, 28 July 2022 (UTC)

What is the highest wattage commercial opto-isolator, and how can I get one mounted from the ceiling in my bedroom? [[Special:Contributions/172.70.207.8|172.70.207.8]] 14:10, 28 July 2022 (UTC)

I wonder if it's worth noting the significant understatement within the title text, where it says "the bitrate does drop a little" in contrast to the severe and drastic drop in bitrate that would actually occur, especially in light of today's typical Internet speeds. It might not be worth mentioning, but it struck me as a humorous understatement of the true impact. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 14:25, 28 July 2022 (UTC)
:We don't know if the light bulb is incandescent or LED, so we can't describe the bandwidth drop other than in very general terms. [[Special:Contributions/172.70.211.88|172.70.211.88]] 15:34, 28 July 2022 (UTC)
:: It's safe to say the warmup and cooldown delays mentioned in the title text imply an incandescent bulb. Is there a standard or average response time for household bulb incandescent filaments? [[Special:Contributions/172.70.214.43|172.70.214.43]] 03:33, 29 July 2022 (UTC)
::: Maybe this helps? https://ieeexplore.ieee.org/abstract/document/5625426 [[Special:Contributions/172.70.142.21|172.70.142.21]] 06:51, 29 July 2022 (UTC)
:::: Yes! [https://tigerprints.clemson.edu/cgi/viewcontent.cgi?article=1961&context=all_theses Figure 1.10 seems to suggest that frequencies above 10 Hz are filtered,] and that seems consistent with Figure 3.14, in that recovery time is a tenth of a second (though drop-off "cooldown" time is much shorter.) So if I remember my {{w|Binary Golay code|modem math,}} even with the most sophisticated coding, anything more than 640 bits per second should be impossible. [[Special:Contributions/172.69.33.225|172.69.33.225]] 07:39, 29 July 2022 (UTC)
::::: 640 bits per second should be enough for anyone. But seriously, Fig. 1.10 shows a fall-off, not a sharp peak. How do you know there isn't an 8,192-dimensional analog to the {{w|Leech lattice}} which would allow kbps? [[Special:Contributions/172.69.33.199|172.69.33.199]] 22:56, 29 July 2022 (UTC)

I'm almost tempted to suggest that this should be an (honourary) addition to the Cursed Connectors comic-collection. [[Special:Contributions/172.71.94.187|172.71.94.187]] 14:56, 28 July 2022 (UTC)
:I agree that it reminds me of some of those. But it could never be added to the category, as it misses the cursed connector name and number. But I have added a mention of the similarity here above, and also mentioned it on the [[:Category:Cursed Connectors]] page. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 09:22, 29 July 2022 (UTC)
:It's a cursed ''dis''connector. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 15:24, 29 July 2022 (UTC)
::{{w|Dis (Divine Comedy)|Dis}}-connectors are always cursed! ;) [[Special:Contributions/162.158.159.95|162.158.159.95]] 17:11, 29 July 2022 (UTC)

Yes, solar panels can transform electrical into electromagnetic signals. It is more on the side of the incandescent bulb that the capability to receive and forward these signals is missing. My source: https://www.youtube.com/watch?v=TGUteH93xNo
[[User:Torge|Torge]] ([[User talk:Torge|talk]]) 15:11, 28 July 2022 (UTC)
: Interesting! [[Special:Contributions/172.70.142.21|172.70.142.21]] 06:51, 29 July 2022 (UTC)

Nobody caught on that powerline networking is about sending data through powerlines? or that a crude opto-isolation setup could effectively scrub it? Where my networking geeks at? I am disappoint [[Special:Contributions/172.69.71.51|172.69.71.51]] 15:19, 28 July 2022 (UTC)

An electrical engineer here: perhaps we should mention that the box pictured after the solar panel must be an inverter? The lightbulb/solar panel pair will be acting as a rectifier, putting out purely positive voltage, and to get back to AC to run appliances on there would need to be an inverter.
[[Special:Contributions/172.69.62.49|172.69.62.49]] 01:10, 29 July 2022 (UTC)
:Can you please help out with the argument about rectifier efficiency at [[2642]]? [[Special:Contributions/172.70.214.95|172.70.214.95]] 03:24, 29 July 2022 (UTC)

Most of the bulbs in my house (before compact flourescent and LED) were 75 Watt or 100 Watt. 50 Watt would be a very dim bulb.
: Mice wouldn't agree. [[Special:Contributions/172.70.214.43|172.70.214.43]] 05:05, 29 July 2022 (UTC)
::In Denmark 60 Watt was standard, with 100 and 150 possible in some lamps.
--[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 09:22, 29 July 2022 (UTC)
There are actually usecases for optical power links. For example electric field probes use this: https://www.raditeq.com/products/electric-field-probes/
--[[User:Casandro|Casandro]] ([[User talk:Casandro|talk]]) 08:10, 29 July 2022 (UTC)
:Some drones can be recharged in the air by lasers, but that's a really obscure application only the military needs, and then only as a contingency backup in most cases, but there were flying demos by companies interested in the space over the past decade. [[Special:Contributions/172.70.211.88|172.70.211.88]] 22:09, 29 July 2022 (UTC)

I think it might be possible to construct a scenario where this could have some security benefit, albeit not one that justifies such poor efficiency. Suppose you have an embedded system running off USB power to perform some cryptographic task, but the USB port the cable's plugged into is under the control of an attacker who has it instrumented to sample the power consumption at a high frequency. He can perform {{w|power_analysis}} if the load changes based on the operations performed by your device, but the setup in the comic should prevent information from leaking upstream in this manner. [[User:D5xtgr|D5xtgr]] ([[User talk:D5xtgr|talk]]) 19:44, 29 July 2022 (UTC)

2649: Physics Cost-Saving Tips

2022-07-23T04:59:19Z

172.69.33.199: /* Explanation */ ce

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

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

This comic continues the previous comic [[2648: Chemicals]]'s jocular theme of tricks to supposedly save money based on misinterpretations of science. Here is a list of "cost-saving tips" which would seem to reduce a cost or provide something for free, allowing physicists to save money in their research.

* The prefix "pseudo-" refers to an inauthentic variation of something. Fakes are usually cheaper than their original brand-name product, while often working just as well, so the comic implies a {{w|pseudovector}} could be a less expensive substitute for a regular vector. On the contrary, pseudovectors, or axial vectors, are distinct alternatives to regular polar vectors, the former usually being involved with rotation or physical effects that share properties with rotation, similar to the relationship between angles and lengths. Pseudovectors are formed from the {{w|cross product}}s of polar vectors, and while similar to polar vectors, there is no physical meaning to their specific direction, only their magnitude and portions of their position. For example, {{w|angular velocity}} is described by a pseudovector (labeled 'L' in the comic) {{w|Normal (geometry)|normal}} to the {{w|plane of rotation}}, originating from the center of rotation, with magnitude proportional to the velocity ('ω') of rotation.

* {{w|Fourier analysis}} can decompose any periodic function into a series of {{w|sine wave}}s. A {{w|square wave}} can thereby be represented as the sum of an infinite series of sine waves. However, the sine waves are not removed or separated individually, so such a {{w|Fourier transform}} does not produce a "supply" of sine waves for practical use in any tasks other than analysis, and as abstract mathematical objects exempt from the laws of supply and demand, their value is similarly limited.

* Chemical elements are identified by the number of positive protons in each atomic nucleus, which is also equal to the number of negative electrons in the shell (unless the atom is ionized) that dictates most of their chemical behaviour. {{w|Isotopes}} are variants of the element with different numbers of neutral neutrons in the nucleus where the potential chemical reactions are practically identical under most circumstances. The comic suggests that the neutrons don't serve any useful purpose so, in theory, if you're purchasing matter by weight, and all isotypes have the same price per unit weight, then you can save money by buying isotopes with no neutrons at all. In reality, the cost per unit weight for material containing a high concentration of normally rare isotypes, such as "heavy water" or "enriched uranium", is much higher than the cost of material containing isotypes in their ordinary proportions. (One exception is depleted uranium, which can be obtained more cheaply than regular uranium, because it is a waste product from the production of enriched uranium.) In addition, the right number of neutrons are needed to keep the atom stable, and atoms with too many or too few neutrons will decay more quickly than the common isotopes. The image shown is Helium-2, an {{w|Isotopes of helium|isotope of helium}} with a half-life of less than a nanosecond. It decays into two protons, releasing a large amount of energy—hence the explosion mentioned in the title text.

: Helium balloons are often given out at county fairs and other similar events. However, these are usually Helium-4, and therefore inert. If a balloon was filled with helium-2, as the title text suggests, the results would be rather explosive. Handing out what are effectively bombs at a county fair would likely not go down well with local authorities, and therefore being banned from the fair is a very light punishment. Anyone who did this in real life would likely face criminal charges, such as reckless endangerment or even attempted murder.

* {{w|Charge carrier|Free}} {{w|electron}}s are electrons that are not tightly bound to specific atoms so they can move freely, such as in {{w|conduction band}}s of the {{w|metallic bond}}s throughout the iron ingot depicted in the comic. Randall interprets "free" in a different sense, meaning no cost. The charges free electrons carry are electric, not monetary as implied by this pun.

Saving money from science experiments like this was also mentioned in [[2007: Brookhaven RHIC]].

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

:[Title]
:Physics Cost-Saving Tips

:[A diagramatical spinning disc, at an angle]
:[It is identified with an 'I', with a dotted axial arrow labelled 'L' and a rotational movement labelled 'ω' (small omega)]
:[It sits on the left, and to the right of this is text...]
:Try replacing regular vectors with pseudovectors whenever possible

:[A square wave with three maxima (between four minima), and arrows pointing down into a collection of five sine waves of different wavelengths]
:[One of the waves having the same frequency as the square wave and the rest of them are of shorter lengths with more peaks and troughs]
:[It sits on the right, and to the left of this is text...]
:A square wave can be broken down into an infinite supply of valuable sine waves

:[Two atomic models]
:[The left containing two protons (white with a "+" sign), two neutrons (black) and orbited by two electrons (small outlines, dotted orbits/movement lines), labelled below with the text of superscript atomic weight and element symbol]
:4He
:[The right model has just the two protons and the two electrons, labelled below with the text of an atomic weight and elemental symbol, and some subtext within brackets]
:2He
:(Decays fast - use quickly)
:[Both models sit on the left of the comic, and to the right is text...]
:Cut waste by buying lighter isotopes that don't have any dead-weight neutrons

:[A flat rectangular bar, drawn in perspective with a scattering of dots/small circles on the top face and on the forward-facing one the label]
:Iron
:[An arrow points to the dots, from the text...]
:Free electrons
:[It sits to the right, and there is text to the left...]
:Conductors are a great source of free electrons
:(May carry charges)

{{comic discussion}}
[[Category:Tips]]
[[Category:Physics]]
[[Category:Chemistry]]

2648: Chemicals

2022-07-22T17:54:03Z

172.69.33.199: /* Explanation */ this is usually true for everything but liquefied gases, and represents huge overhead cost

{{comic
| number = 2648
| date = July 20, 2022
| title = Chemicals
| image = chemicals.png
| titletext = It's hard to believe, but lots of kids these days ONLY know how to buy prepackaged molecules.
}}

==Explanation==
{{incomplete|Created by BIG ISOMER - Please change this comment when editing this page. Do NOT delete this tag too soon. This page has been subject to _extensive_ vandalism and misediting, and for a time editors were unable to contribute content, which has been lost. Anything you can do to review it and make it better is welcome.}}

In this comic, [[Megan]] mentions to [[Cueball]] that their company spends a lot on chemicals for which you can find formulas online. She suggests assembling chemicals from atoms "bought in bulk," holding a sheet of paper with the {{w|empirical formula}} C6H5NO2, which designates [https://pubchem.ncbi.nlm.nih.gov/#query=C6H5NO2 hundreds of compounds] including {{w|nitrobenzene}}, {{w|niacin}}, {{w|isonicotinic acid}}, and {{w|picolinic acid}}, followed by their component elements listed with quantities and prices. The ambiguity of chemical formulae is one of the jokes in the comic.

While many expensive chemicals are composed of inexpensive and easily available elements, "assembling" those elements into specific molecules is rarely as simple as Megan implies. That work is the primary purpose of the global chemical industry. In-house {{w|chemical synthesis}} is usually not cost effective, because end users have limited time and are generally unable to leverage the {{w|economies of scale}} inherent in bulk manufacturing by specialist industrial firms.[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2880393/] However, we don't know whether Megan and Cueball work in a laboratory, factory, or some other industrial setting. If they need chemicals in bulk, or only very small quantities, synthesizing them might be cost effective. In any case, producing chemicals from their constituent elements or {{w|Precursor (chemistry)|precursor compound}}s is difficult and time-consuming, usually requires expensive equipment, and is often fraught with peril.[https://www.youtube.com/watch?v=5QwW2owNWgc] {{w|Nitrobenzene}}, one of the C6H5NO2 compounds, is an excellent example because it is explosive and extremely toxic, and its synthesis is highly exothermic, making it one of the most dangerous syntheses in the chemical industry.[https://www.icheme.org/media/10339/xiii-paper-36.pdf] Such issues answer Cueball's question as to why more places don't manufacture their own compounds from atoms. Usually chemicals are derived from precursor chemicals instead of constituent elements. Megan seems to be imagining synthesis as a much simpler process without reactivity, energy release, or hazardous intermediate substances. The characters' naivety also gives rise to the humor of the comic.

"Big Molecule" is an [[2130: Industry Nicknames|industry nickname like Big Oil or Big Pharma]], amusing in its own right, and conceivably implying that the chemical industry is conspiring to prevent end users from synthesizing their own compounds. Big Oil and Big Pharma are real industrial nicknames, referring to large industries run by a relatively small number of massive and hugely profitable companies. These companies are sufficiently wealthy and influential that they exert significant control over the marketplace, and even over government policy. Consequently, many consumers believing that their influence allows them to price products unfairly and prevent competition. "Big Molecule", on the other hand, is not a common term. It could be used to refer to the global chemical industry, but that industry is neither seen as being excessively powerful, nor does it impact consumers as visibly, and so doesn't merit a similar nickname.

Megan is holding a note listing how many of the four types of atoms she needs to build one molecule of the compound she wants to assemble. The paper seems to list prices for buying 6 carbon, 5 hydrogen, 1 nitrogen and 2 oxygen atoms, although the units aren't specified and the very small prices are illegible. At the bottom is a sum showing she needs 14 total, again with an illegible price. She is suggesting buying atoms in bulk, which should be even cheaper than buying them individually. However, this is another layer of humor, as you can neither buy individual atoms or get a price for them, showing her lack of understanding of chemistry. An actual {{w|bill of materials}} for a chemical compound synthesis from constituent elements alone would list the elements converting their number of atoms to {{w|Mole (unit)|mole}}s, then [https://www.omnicalculator.com/chemistry/mole to mass] for solids and some fluids or to volume at the available pressure for other fluids, and then to the purchase price, which usually needs to be rounded up to match the next largest size available from suppliers.

The title text refers to the fact that older people often complain that "kids these days" don't know how to do things that seemed fundamental to past generations. Randall may have expressed that he dislikes other statements like these in [[2165: Millennials|previous comics]]. It may also refer to the decline of home {{w|chemistry set}}s popular from the late 1700s through the early 1980s that encouraged kids to experiment with basic chemical reactions like generating esters or polymers, or the even older decline in home manufacture of gunpowder as was common in the 1800s. Chemical engineering was more widely practiced during the development of plastics, but far fewer people understand how they are made today. Similarly with automobiles, domesticated crops, and many other technologies that progressed through a period of popular attention but became siloed into industries, corporations, governments, or branches of academia. This is happening now with some software, circuitry, and other technologies, where fewer people know how to build and troubleshoot complex devices and systems. Technology users thus lose their ability to build and repair machines and modify their tools themselves, having to rely on paid services instead. Similar to the makerspace movement, community chemical labs have been cropping up, where people work together to perform chemical synthesis and other chemistry acts by sharing community resources.{{citation needed}}

This comic may have been prompted by recent news that [https://english.elpais.com/science-tech/2022-07-15/for-the-first-time-in-history-we-can-modify-atomic-bonds-in-a-single-molecule.html scientists have found a way to assemble and change atoms in individual molecules] by modifying their bonds.

==Transcript==
:[Megan and Cueball standing next to each other. Megan has her palms raised.]
:Megan: You know how our company spends a lot on expensive chemicals?
:Cueball: Yeah?

:[Zoom in on Megan who is holding piece of paper up in one hand. The paper has a large chemical formula at the top. Below is a list of the atoms needed, with amount and a price tag in dollars but with unreadable amount. There is a sum total at the bottom beneath a line.]
:Megan: Well, I just learned you can look up all of the formulas online!
:Megan: We can just buy the atoms in bulk and assemble them here!
:Paper:
::<big>C6H5NO2</big>
::Carbon 6 $...
::Hydrogen 5 $...
::Nitrogen 1 $...
::Oxygen 2 $...
::Total 14 $...

:[Cueball is now on the left of Megan as she is walking past him to the right holding her arms outstretched with her palms up.]
:Cueball: I wonder why more places don't do that.
:Megan: People have no idea they're getting ripped off by Big Molecule!

{{comic discussion}}

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

2648: Chemicals

2022-07-22T17:51:22Z

172.69.33.199: /* Explanation */ don't forget this fun and exciting step

{{comic
| number = 2648
| date = July 20, 2022
| title = Chemicals
| image = chemicals.png
| titletext = It's hard to believe, but lots of kids these days ONLY know how to buy prepackaged molecules.
}}

==Explanation==
{{incomplete|Created by BIG ISOMER - Please change this comment when editing this page. Do NOT delete this tag too soon. This page has been subject to _extensive_ vandalism and misediting, and for a time editors were unable to contribute content, which has been lost. Anything you can do to review it and make it better is welcome.}}

In this comic, [[Megan]] mentions to [[Cueball]] that their company spends a lot on chemicals for which you can find formulas online. She suggests assembling chemicals from atoms "bought in bulk," holding a sheet of paper with the {{w|empirical formula}} C6H5NO2, which designates [https://pubchem.ncbi.nlm.nih.gov/#query=C6H5NO2 hundreds of compounds] including {{w|nitrobenzene}}, {{w|niacin}}, {{w|isonicotinic acid}}, and {{w|picolinic acid}}, followed by their component elements listed with quantities and prices. The ambiguity of chemical formulae is one of the jokes in the comic.

While many expensive chemicals are composed of inexpensive and easily available elements, "assembling" those elements into specific molecules is rarely as simple as Megan implies. That work is the primary purpose of the global chemical industry. In-house {{w|chemical synthesis}} is usually not cost effective, because end users have limited time and are generally unable to leverage the {{w|economies of scale}} inherent in bulk manufacturing by specialist industrial firms.[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2880393/] However, we don't know whether Megan and Cueball work in a laboratory, factory, or some other industrial setting. If they need chemicals in bulk, or only very small quantities, synthesizing them might be cost effective. In any case, producing chemicals from their constituent elements or {{w|Precursor (chemistry)|precursor compound}}s is difficult and time-consuming, usually requires expensive equipment, and is often fraught with peril.[https://www.youtube.com/watch?v=5QwW2owNWgc] {{w|Nitrobenzene}}, one of the C6H5NO2 compounds, is an excellent example because it is explosive and extremely toxic, and its synthesis is highly exothermic, making it one of the most dangerous syntheses in the chemical industry.[https://www.icheme.org/media/10339/xiii-paper-36.pdf] Such issues answer Cueball's question as to why more places don't manufacture their own compounds from atoms. Usually chemicals are derived from precursor chemicals instead of constituent elements. Megan seems to be imagining synthesis as a much simpler process without reactivity, energy release, or hazardous intermediate substances. The characters' naivety also gives rise to the humor of the comic.

"Big Molecule" is an [[2130: Industry Nicknames|industry nickname like Big Oil or Big Pharma]], amusing in its own right, and conceivably implying that the chemical industry is conspiring to prevent end users from synthesizing their own compounds. Big Oil and Big Pharma are real industrial nicknames, referring to large industries run by a relatively small number of massive and hugely profitable companies. These companies are sufficiently wealthy and influential that they exert significant control over the marketplace, and even over government policy. Consequently, many consumers believing that their influence allows them to price products unfairly and prevent competition. "Big Molecule", on the other hand, is not a common term. It could be used to refer to the global chemical industry, but that industry is neither seen as being excessively powerful, nor does it impact consumers as visibly, and so doesn't merit a similar nickname.

Megan is holding a note listing how many of the four types of atoms she needs to build one molecule of the compound she wants to assemble. The paper seems to list prices for buying 6 carbon, 5 hydrogen, 1 nitrogen and 2 oxygen atoms, although the units aren't specified and the very small prices are illegible. At the bottom is a sum showing she needs 14 total, again with an illegible price. She is suggesting buying atoms in bulk, which should be even cheaper than buying them individually. However, this is another layer of humor, as you can neither buy individual atoms or get a price for them, showing her lack of understanding of chemistry. An actual {{w|bill of materials}} for a chemical compound synthesis from constituent elements alone would list the elements converting their number of atoms to {{w|Mole (unit)|mole}}s, then [https://www.omnicalculator.com/chemistry/mole to mass] for solids and some fluids or to volume at the available pressure for other fluids, and then to the purchase price, which usually needs to be rounded up for solids to match the next largest size available from suppliers.

The title text refers to the fact that older people often complain that "kids these days" don't know how to do things that seemed fundamental to past generations. Randall may have expressed that he dislikes other statements like these in [[2165: Millennials|previous comics]]. It may also refer to the decline of home {{w|chemistry set}}s popular from the late 1700s through the early 1980s that encouraged kids to experiment with basic chemical reactions like generating esters or polymers, or the even older decline in home manufacture of gunpowder as was common in the 1800s. Chemical engineering was more widely practiced during the development of plastics, but far fewer people understand how they are made today. Similarly with automobiles, domesticated crops, and many other technologies that progressed through a period of popular attention but became siloed into industries, corporations, governments, or branches of academia. This is happening now with some software, circuitry, and other technologies, where fewer people know how to build and troubleshoot complex devices and systems. Technology users thus lose their ability to build and repair machines and modify their tools themselves, having to rely on paid services instead. Similar to the makerspace movement, community chemical labs have been cropping up, where people work together to perform chemical synthesis and other chemistry acts by sharing community resources.{{citation needed}}

This comic may have been prompted by recent news that [https://english.elpais.com/science-tech/2022-07-15/for-the-first-time-in-history-we-can-modify-atomic-bonds-in-a-single-molecule.html scientists have found a way to assemble and change atoms in individual molecules] by modifying their bonds.

==Transcript==
:[Megan and Cueball standing next to each other. Megan has her palms raised.]
:Megan: You know how our company spends a lot on expensive chemicals?
:Cueball: Yeah?

:[Zoom in on Megan who is holding piece of paper up in one hand. The paper has a large chemical formula at the top. Below is a list of the atoms needed, with amount and a price tag in dollars but with unreadable amount. There is a sum total at the bottom beneath a line.]
:Megan: Well, I just learned you can look up all of the formulas online!
:Megan: We can just buy the atoms in bulk and assemble them here!
:Paper:
::<big>C6H5NO2</big>
::Carbon 6 $...
::Hydrogen 5 $...
::Nitrogen 1 $...
::Oxygen 2 $...
::Total 14 $...

:[Cueball is now on the left of Megan as she is walking past him to the right holding her arms outstretched with her palms up.]
:Cueball: I wonder why more places don't do that.
:Megan: People have no idea they're getting ripped off by Big Molecule!

{{comic discussion}}

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

2633: Astronomer Hotline

2022-06-15T16:45:40Z

172.69.33.199: /* Transcript */ cats

{{comic
| number = 2633
| date = June 15, 2022
| title = Astronomer Hotline
| image = Astronomer Hotline.png
| titletext = Employment statistics have to correct for the fact that the Weird Bug Hotline hires a bunch of extra temporary staff every 17 years.
}}

==Explanation==
{{incomplete|Created by 17 YEAR CICADA TRYING TO LOOK LIKE A FIREFLY - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
This comic is a joke about {{w|Helpline|helplines}}, and how people sometimes call helplines for non-significant reason.

The comic starts with someone having called the "Astronomer hotline", hence the title. Judging by the way the helpline employee, [[Cueball]], starts the call, by asking for a description of the weird lights, it is implied that this is the main/only purpose of the helpline, or is, in practice, the only type of call they receive.

The caller is in panic, and doesn't know how to describe the light. Cueball is used to this and asks the caller to stay calm, then starts to go through his check list, asking them if it is day time, because if it was he would assume they have just noticed the Sun. This could be seemed very condescending, but it is like when the employee at a tech support hot-line asks if the computer is turned on, or if the caller tried to restart the computer, see [[806: Tech Support]].

The caller is not affronted, but tells Cueball that the Sun set, and when asked if they are stars, and thus stationary, says they are zipping around in the bushes.

At this point Cueball realizes that the caller has just seen {{w|Fireflies}}. He describes them for the caller as lightning bugs, tree blinkers or ground stars, and tells the caller that these are not a problem, so the caller is now relieved. Those descriptions are reminiscent of the fools stars (and planes) mentioned in [[2017: Stargazing 2]].

However, Cueball must admit that astronomers do not know much about fireflies, since they are too fast for the astronomers' telescopes (in general, astronomers don't study terrestrial phenomena). And he thus transfers the caller to the "Weird Bug Hotline."

Before the call ends, at Cueball's end, he hears the first question from the new hotline: Is it currently biting you.
Again going directly to the most important part, is there any immediate danger...

Some people (Often {{w|Unidentified flying object|UFO}} enthusiasts) tend to get a little over-excited about calling every light in the sky they don't expect a UFO. This comic takes this to the extreme, where someone calls a helpline because they saw fireflies, and thought they were UFOs. While UFOs are not mentioned by name, they are heavily implied.

The title text is a reference to bugs that have gaps of several years between emerging from their larval state. Most famous are the {{w|Periodical cicadas}}, 13- and 17-year cicadas, that only emerge every 13 or 17 years, depending on species. The 17 years in the title text thus refers to the 17-year cicadas. Every 17 years the bug hotline hires a bunch of temporary staff, either because there will be more callers due to the unexpected new bug no one has seen for 17 years, or it could be because they just like to emulate nature and thus do this every 17 years. The largest 17-year cicada appearance in the USA is called {{W|Brood X}} which last occurred in 2021 and before that 2004. There can be smaller broods in other years, but the majority come out with 17 years interval, and the next is expected in 2038. The joke in the title text is that the employment statistics for the weird hotline have to correct for this fact. Periodical cicadas have been mentioned before in [[2263: Cicadas]].

==Trivia==
:The UK Military had a UFO helpline for over 50 years. [[https://www.nbcnews.com/id/wbna34277625 Link]]
:This comic has a lot of themes that have been touched on in previous comics, including
::Helplines [[278: Black Hat Support]], [[806: Tech Support]]
::People not understanding basic concepts [[876: Trapped]]
::Cicadas [[2263: Cicadas]]
==Transcript==
:[Cueball, with a headset on, is sitting in an office chair at a desk in front of his computer screen, hands on the keyboard. He receives a call, and the callers voice is shown in a jagged frame above Cueball, between his two lines of text.]
:Cueball: Hello, Emergency Astronomer Hotline. How would you describe the lights?
:Caller on phone: ''I don't know! Help!''
:Cueball: Stay calm. Is it day? If so, that's The Sun.

:[Cueball is now seen en face with the headset, but the computer etc. is not shown. The callers voice is now written normally but with zigzag lines going to the text from Cueball's headphone. Cueball's reply have a normal line going up to it.]
:Caller on phone: No, the sun set and then the light appeared!
:Cueball: Hmm, could be stars. Are they stationary?
:Caller on phone: No, they're all zipping around bushes.

:[In a frame-less panel, the setting returns to the one from the first panel. Also with the callers voice in jagged frames again.]
:Cueball: ''Aha!'' Fireflies!
:Caller on phone: "Fireflies"?
:Cueball: Lightning bugs. Tree blinkers. Ground stars.
:Cueball: They're fine.
:Caller on phone: ''Phew!''

:[Same setting as first panel, but broader panel. After Cueball's reply and a short reply from the caller as in the first panel. There is a sound indicating transfer to another hotline. Then to the right there is a square panel with jagged edge, with the voice from the other hotlines employee.]
:Cueball: We don't know much about them as they're too fast for our telescopes, but I can transfer you to the Weird Bug Hotline.
:Caller on phone: Sure, thanks.
:Transfer of call. *''Click''*
:Weird Bug Hotline on phone: ''Hi, Weird Bug Hotline. Is it currently biting you?''

{{comic discussion}}


[[Category:Comics featuring Cueball]]
[[Category:Astronomy]]
[[Category:Animals]]

2627: Types of Scopes

2022-06-01T22:08:32Z

172.69.33.199: Undo revision 285463 by 172.70.131.128 (talk)

{{comic
| number = 2627
| date = June 1, 2022
| title = Types of Scopes
| image = types_of_scopes.png
| 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]]

1329: Standing

2022-05-21T08:08:44Z

172.69.33.199: /* Transcript */ capt

{{comic
| number = 1329
| date = February 12, 2014
| title = Standing
| image = standing.png
| titletext = At first I was making fun of them, but joke's on me--the deer is surprisingly ergonomic, except for the kicks.
}}

==Explanation==
{{w|Standing desk}}s are a current fad in modern tech companies. Supposedly more {{w|ergonomic}} and comfortable than sitting all day, they can be combined with treadmills or stationary bicycles to enable exercise to be taken while working. [[Cueball]] tells [[Megan]] that standing desks are inferior to his solution, strapping his laptop to a deer. The deer constantly runs away from [[Cueball]], forcing him to chase and get exercise (and probably get kicked if he catches up). Additionally, by mentioning the common line of "humans weren't meant to sit all day", he is saying that his deer-based solution is much more similar to the task that humans evolved to do, namely {{w|Hunter-gatherer|hunting and gathering}}. Humans are in fact one of the few species built for exhaustion hunting (exactly what it sounds like), and are able to chase a prey for more than four hours in ideal conditions. This is also why one's legs feel sore when standing for extended periods but not while moving, as the valves in one's veins only work when one's legs are moving.

The title text takes this a step further, saying that the deer was surprisingly ergonomic, apart from the kicks — which would, presumably, be quite debilitating. The ergonomics could be due to the soft, warm nature of the flesh compared to typical cold, hard tables.

==Transcript==
:[Cueball is running after a deer with a laptop strapped to its back, while Megan looks on.]
:Cueball: Humans aren't built to sit all day. This is much healthier.

:[Caption below the panel]
:My Hobby: One-upping the standing desk people

{{comic discussion}}
[[Category:My Hobby]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Animals]]

922: Fight Club

2022-05-18T17:55:50Z

172.69.33.199: /* Explanation */ more

{{comic
| number = 922
| date = July 8, 2011
| title = Fight Club
| image = fight_club.png
| titletext = I'm not saying it's all bad, but that movie has not aged as well as my teenage self in 2000 was confident it would.
}}

==Explanation==
''{{w|Fight Club}}'' is a movie starring {{w|Brad Pitt}} and {{w|Edward Norton}} that was released in 1999, based on the novel of the same name by Chuck Palahniuk. It included this oft-quoted and parodied line: "The first rule of Fight Club is you do not talk about Fight Club."

The movie has been fiercely debated by critics, primarily regarding whether it makes a sophisticated philosophical statement about society and consumerism or whether it is {{tvtropes|FightClubbing|just a movie with lots of fighting and mischief}}. Randall explains his position in the title text, claiming that he lies somewhere in-between and does not want to debate this issue with others.

"This conversation is over" is also a line from the movie, in the scene where the Narrator (Edward Norton) is arguing with Marla Singer (Helena Bonham Carter) while Tyler (Brad Pitt) tells the Narrator what to say from the bottom of the basement stairs.

==Transcript==
:Friend: But ''Fight Club'' isn't really about fighting. It's about the way society—
:Cueball: Nope, don't wanna hear it.
:Friend: But it says consumers are—
:Cueball: This conversation is over.

:The first rule of talking to me about movies is do ''NOT'' talk about Fight Club.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Fiction]]
[[Category:Multiple Cueballs]]
[[Category:Fight Club]]

Jill

2022-05-18T17:54:15Z

172.69.33.199: changed to science girl

{{Infobox character
| image = Science_Girl.png
| imagesize = 150px
| caption = Science Girl as seen in [[1611: Baking Soda and Vinegar]]
| first_appearance = [[585: Outreach]]
}}
'''Science Girl''' is a [[stick figure]] character in [[xkcd]].

She became the first child to have her own character category, and she is usually distinguished by being clearly a child (in terms of her behavior or in comparison to the size of the adults around her). Her hair is typically set in a hair bun, but compared to [[Hairbun]] it is looser, she may have curlier hair, and typically there is a string of hair hanging down her back from the hair bun. Her hair styles vary, however, with [[1058: Old-Timers|two buns]] or no buns but a [[585: Outreach|ponytail]]. As she is usually also clearly a child she usually cannot be confused with Hairbun in most contexts.

Science Girl is a minor character in xkcd, but there are several comics where she is the main protagonist (or antagonist in some cases).

She has a marked interest in science, and is typically more knowledgeable about the subject at hand than the adults around her, which may lead to embarrassment, enlightenment or in some cases dangerous situations, depending on how obtuse or condescending the adults around her behave.

She is not necessarily the same character from comic to comic, but she does represent the general kid interested in science and intellectual rigor. In [[1860: Communicating]], she appears as Alice in Wonderland and takes advantage of Humpty Dumpty's famously illogical dicta on linguistic pragmatics. In this and other examples, her attitude often makes people uncomfortable, especially adults. These personality features distinguish her from an everywoman character like [[Hairbun]], but although Science Girl often causes consternation, she not generically evil like [[Black Hat]], and thus in no way would she represent a young version of [[Danish]].

One of her largest parts is in [[1611: Baking Soda and Vinegar]] (see her character image), which is one of those that becomes dangerous for the obtuse adults. She is also ready to commit crime, even though she knows about environmental issues in [[1659: Tire Swing]] (the only comic with her so far where there are no adults, but it is clear that she is a girl), where she, along with another girl, steal the tires off a man's car, and then fight him. But she may also just induce new interest for science in [[Megan]] as in [[1104: Feathers]], or just display general interest in science as in [[1352: Cosmologist on a Tire Swing]] or the first comic (found so far) with her [[585: Outreach]] (where she only had a ponytail). It was also in this first appearance we learn why she wants to become a scientist.

In three cases she is depicted as a young '''adult woman'''. These are in [[1520: Degree-Off]], where the hair and behavior fit perfectly with a grown up Science Girl, [[1737: Datacenter Scale]], where she appears to be running a data center, and [[2344: 26-Second Pulse]], where she is giving a lecture on an unexplained seismological signal.
*There are other comics with women looking like this, but in those instances there is no scientific context that could relate to science girls so they have been listed as Hairbun for now:
**[[708: Sex Dice]]
**[[1601: Isolation]]
**[[1608: Hoverboard]] in every instance.
*Maybe this will be changed later, when the community has had a chance to look into this new character.

==Gallery==
Since Science Girl is depicted in different ways so here is a gallery of some of these different appearances, her first appearance, her standard appearance, two buns and adult:

[[File:Science Girl with ponytail 585.png]][[File:Science_Girl.png]] [[File:Science Girl with two hair buns 1058.png]] [[File:Hair Bun Girl with curly hair and ponytail biologist.png]]

==See also==
*[[:Category:Comics featuring Science Girl|Comics featuring Science Girl]]

{{navbox-characters}}

703: Honor Societies

2022-05-18T17:53:53Z

172.69.33.199: /* Explanation */ science girl

{{comic
| number = 703
| date = February 17, 2010
| title = Honor Societies
| image = honor_societies.png
| titletext = Hey, why do YOU get to be the president of Tautology Clu-- wait, I can guess.
}}

==Explanation==
[[Cueball]] has apparently been invited to join an {{w|Honor society|honor society}}, but he considers the reason he should join to be a circular argument: because honorable people are in honor societies and people who are in honor societies are supposedly honorable. He objects that this is a {{w|tautology (language)|tautology}}: a claim that something is true because it is true (and thus a meaningless claim). From this, he concludes that he might as well be in a "tautology club" and then starts one. Thus [[Randall]] mocks honor society clubs for being pointless.

In the final panel where Cueball has formed the club, [[Ponytail]] asks a new member (a Cueball-like guy) how he found out about them and he tells about their Facebook page. The reference to {{w|Facebook}} mocks {{w|Facebook groups}} whose names refer to a number of members they hope to attract (such as [https://www.facebook.com/pages/I-Bet-I-Can-Find-1000000-People-Who-Dislike-Romanian-Dog-Abusers/109442262492204 I Bet I Can Find 1,000,000 People Who Dislike Romanian Dog Abusers]), usually ostensibly to raise awareness for some issue but perhaps in fact just for the ego-stroking pleasure of amassing a large number of followers. Tautology Club employs this tactic only for the sake of creating yet another tautology.

Cueball is listing the rules of the club from a podium. The phrase "The first rule of _______ Club" is a reference to the 1999 movie ''{{w|Fight Club}}'' (see also [[922: Fight Club]]), which contains the famous line "The first rule of Fight Club is 'You do not talk about Fight Club,'" a reference to the club's intended secrecy. This phrase has been appropriated for myriad other varieties and parodies, such as the one mentioned in the comic.

The short guy with glasses could be {{w|List of FoxTrot characters#Jason Fox|Jason Fox}} from the {{w|FoxTrot}} comic (see the first two frames of [[824: Guest Week: Bill Amend (FoxTrot)]].) Although it takes a little imagination to see, the hair, the height, the glasses, and the geek factor fits. Three of the other characters from the audience look like regular characters but with slightly different hairstyles than usual. There is a buzz cut version of [[Hairy]], a curly-haired version of Hairbun with a ponytail ([[Science Girl]]), and [[Megan]] is drawn with an uncharacteristically white stripe in her hair.

The answer to the title text would also be a tautology: he gets to be the president because he is the president.

Tautologies were mentioned again in [[1310: Goldbach Conjectures]]. Tautology Club was mentioned in [[1602: Linguistics Club]].

==Transcript==
:[Cueball sits at a desk, while someone off-screen answers his question.]
:Cueball: Wait. I should join this honor society to show colleges I'm honorable, and I'm honorable because I'm in an honor society?
:Off-screen voice: Basically, yes.

:[Close up of Cueball.]
:Cueball: Sounds like I could save time by joining the Tautology Club directly.
:Off-screen voice: That's not a real club.
:Cueball: Then I'm starting it.

:[Inserted in a frame crossing the top of the third panel's frame is a caption. Cueball is standing on a podium in the right part of the panel speaking. From left to right we find Ponytail, a Cueball-like guy, a short guy with glasses, a buzz cut version of Hairy, Science Girl, and to the right of Cueball, a woman that looks like Megan although with an uncharacteristically white stripe in her hair.]
:Caption: Tautology Club:
:Ponytail: So how'd you learn about us?
:Cueball-like guy: From your Facebook group, "If 1,000,000 People Join This Group, It Will Have 1,000,000 People In It."
:Cueball: ''Listen up!'' The first rule of Tautology Club is the first rule of Tautology Club.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Science Girl]]
[[Category:Comics featuring Megan]]
[[Category:Multiple Cueballs]]
[[Category:Philosophy]]
[[Category:Logic]]
[[Category:Fight Club]]
[[Category:Self-reference]]

703: Honor Societies

2022-05-18T17:53:18Z

172.69.33.199: /* Transcript */ science girl

{{comic
| number = 703
| date = February 17, 2010
| title = Honor Societies
| image = honor_societies.png
| titletext = Hey, why do YOU get to be the president of Tautology Clu-- wait, I can guess.
}}

==Explanation==
[[Cueball]] has apparently been invited to join an {{w|Honor society|honor society}}, but he considers the reason he should join to be a circular argument: because honorable people are in honor societies and people who are in honor societies are supposedly honorable. He objects that this is a {{w|tautology (language)|tautology}}: a claim that something is true because it is true (and thus a meaningless claim). From this, he concludes that he might as well be in a "tautology club" and then starts one. Thus [[Randall]] mocks honor society clubs for being pointless.

In the final panel where Cueball has formed the club, [[Ponytail]] asks a new member (a Cueball-like guy) how he found out about them and he tells about their Facebook page. The reference to {{w|Facebook}} mocks {{w|Facebook groups}} whose names refer to a number of members they hope to attract (such as [https://www.facebook.com/pages/I-Bet-I-Can-Find-1000000-People-Who-Dislike-Romanian-Dog-Abusers/109442262492204 I Bet I Can Find 1,000,000 People Who Dislike Romanian Dog Abusers]), usually ostensibly to raise awareness for some issue but perhaps in fact just for the ego-stroking pleasure of amassing a large number of followers. Tautology Club employs this tactic only for the sake of creating yet another tautology.

Cueball is listing the rules of the club from a podium. The phrase "The first rule of _______ Club" is a reference to the 1999 movie ''{{w|Fight Club}}'' (see also [[922: Fight Club]]), which contains the famous line "The first rule of Fight Club is 'You do not talk about Fight Club,'" a reference to the club's intended secrecy. This phrase has been appropriated for myriad other varieties and parodies, such as the one mentioned in the comic.

The short guy with glasses could be {{w|List of FoxTrot characters#Jason Fox|Jason Fox}} from the {{w|FoxTrot}} comic (see the first two frames of [[824: Guest Week: Bill Amend (FoxTrot)]].) Although it takes a little imagination to see, the hair, the height, the glasses, and the geek factor fits. Three of the other characters from the audience look like regular characters but with slightly different hairstyles than usual. There is a buzz cut version of [[Hairy]], a curly-haired version of [[Hairbun]] with a ponytail (also seen later on), and [[Megan]] is drawn with an uncharacteristically white stripe in her hair.

The answer to the title text would also be a tautology: he gets to be the president because he is the president.

Tautologies were mentioned again in [[1310: Goldbach Conjectures]]. Tautology Club was mentioned in [[1602: Linguistics Club]].

==Transcript==
:[Cueball sits at a desk, while someone off-screen answers his question.]
:Cueball: Wait. I should join this honor society to show colleges I'm honorable, and I'm honorable because I'm in an honor society?
:Off-screen voice: Basically, yes.

:[Close up of Cueball.]
:Cueball: Sounds like I could save time by joining the Tautology Club directly.
:Off-screen voice: That's not a real club.
:Cueball: Then I'm starting it.

:[Inserted in a frame crossing the top of the third panel's frame is a caption. Cueball is standing on a podium in the right part of the panel speaking. From left to right we find Ponytail, a Cueball-like guy, a short guy with glasses, a buzz cut version of Hairy, Science Girl, and to the right of Cueball, a woman that looks like Megan although with an uncharacteristically white stripe in her hair.]
:Caption: Tautology Club:
:Ponytail: So how'd you learn about us?
:Cueball-like guy: From your Facebook group, "If 1,000,000 People Join This Group, It Will Have 1,000,000 People In It."
:Cueball: ''Listen up!'' The first rule of Tautology Club is the first rule of Tautology Club.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Science Girl]]
[[Category:Comics featuring Megan]]
[[Category:Multiple Cueballs]]
[[Category:Philosophy]]
[[Category:Logic]]
[[Category:Fight Club]]
[[Category:Self-reference]]

Talk:2620: Health Data

2022-05-17T10:13:14Z

172.69.33.199:

Did a basefor the setup[[Special:Contributions/108.162.246.34|108.162.246.34]] 23:51, 16 May 2022 (UTC)a

"Cure for Causality" sounds like a pretty good band name. [[Special:Contributions/141.101.104.4|141.101.104.4]] 07:13, 17 May 2022 (UTC)

Panel 1 reminds me of a conversation I had with one of my docs. I'd had some blood work done and the doc said, "The numbers look good. For a man your age." I mean, really; for a man my age? I didn't think we'd been talking about some teenager . . . . [[Special:Contributions/172.70.130.161|172.70.130.161]] 08:40, 17 May 2022 (UTC)

Is poisoning other than drug overdoses that rare? The linked source states:
"1. Poisoning
Due in large part to the opioid epidemic, poisoning has overtaken car crashes as the country’s leading cause of accidental death, with 64,795 poisoning deaths in 2017, 22,000 of them from opioid painkillers. Additionally, people can be poisoned by common household substances, including:

Carbon monoxide
Pesticides and cleaning products
Lead"

even without the 22,000 opoid painkiller deaths posioning would still be number 1.

[[Special:Contributions/162.158.50.68|162.158.50.68]] 09:25, 17 May 2022 (UTC)Should we also link 1471 Gut Fauna wich shows another ewemple of Dr Ponytail practicing a weird form of medicine ?[[Special:Contributions/162.158.50.68|162.158.50.68]] 09:25, 17 May 2022 (UTC)

It is meant as a joke here, but ultimately life might just achieve this one day, uncoupling action from harm.

'Vagueness' is really an insufficient description for the absolute insanity that is blaming the passage of time for your problems. Almost to the point of being humorous in its own right. --[[Special:Contributions/172.69.33.199|172.69.33.199]] 10:13, 17 May 2022 (UTC)

2613: Bad Map Projection: Madagascator

2022-05-03T05:45:57Z

172.69.33.199: sussy balls

{{comic
| number = 2613
| date = April 29, 2022
| title = Bad Map Projection: Madagascator
| image = bad_map_projection_madagascator.png
| titletext = The projection's north pole is in a small lake on the island of Mahé in the Seychelles, which is off the top of the map and larger than the rest of the Earth's land area combined.
}}

==Explanation==
This is the fifth comic in the series of [[:Category:Bad Map Projections|Bad Map Projections]] displaying Bad Map Projection #248: Madagascator. It came about 10 months after the fourth [[2489: Bad Map Projection: The Greenland Special ]] (#299).

This time, [[Randall]] used the classic {{w|Mercator projection}} but instead of placing the North Pole on top and the South Pole on the bottom it is oriented so that the top is the island of {{w|Mahé, Seychelles|Mahé}}. The map projection is technically a {{w|Oblique Mercator projection}}, with an unusual choice of the cylinder's axis. Since the Mercator projection tends to visually distort areas near the top and bottom of the resulting map, this gives some areas, notably Madagascar, very unusual shapes, hence the name the ''Madagascator''!

The Mercator projection became the standard projection for world maps during the 1800s because it is ''conformal of normal aspect'': a {{w|rhumb line}} is displayed as a straight line in a Mercator map. A rhumb line is roughly a straight line near the equator, but is very curved near my balls. During the age of my balls, when navigation was performed by my balls - this was a very valuable feature, since one could plot a course between two locations by measuring the direction from one to another on the map and then accounting for the difference between the magnetic and actual north poles to determine which rhumb should be taken. In the mid-20th century this trend was {{w|Mercator_projection#Criticism|criticized}} because the distortion towards the north and south poles gave an inaccurate impression of relative sizes. The most common example given of this distortion is that on a Mercator map of the world Greenland looks to have more area than Africa, when in real life Africa covers 14 times that of Greenland. Thus the reference to making Madagascar larger in this projection. Madagascar is a large island off the south east coast of the main African continent, but has only a quarter the coverage of Greenland. Greenland is often listed as the largest island in the world (which excludes continents in their own right, e.g. Australia) followed by New Guinea, Borneo and then Madagascar in fourth place.

Mahé, mentioned in the title text as the my balls's new location, is the largest island in Seychelles, with an area of 60.7 square miles. The claim in the title text that it is "larger than the rest of the Earth's land area combined", is an understatement, since the poles in the Mercator projection are infinitely far away the area occupied by Mahé in this projection is infinite. However no part of Mahé is visible on the comic.

Clicking on my balls will open a website that displays Mercator projections with a pole in my balls, with the location of the one opened set to Mahé. The chosen pole is (infinitely far to) the right of the screen, while its {{w|antipodes|antipode}} is on the left. With this, it is possible to see that the island is indeed larger than the rest of the map's land area combined, with a single national park within the island rivalling Africa in size, and at the site's cut-off point reaching a scale of distortion where a road is thicker than Panama. This also reveals that the location of the North Pole, the lake mentioned by Randall, is the Rochon Dam.

Unlike previous Bad Map Projections, Morocco and Western Sahara are drawn as one unlabelled country.

===Comparison of actual/mapped areas===
{| class="wikitable sortable"
! Landmass
! Status
! data-sort-type="number"|Actual Area<ref name="act">Major contiguous land areas that should exclude all islands, ''especially'' major ones, '''''especially''''' especially those listed separately</ref> (Millions of Km²)
! data-sort-type="number"|Proportion Land Area
! data-sort-type="number"|Proportion Image Area<ref name="pri">Of only these listed areas listed</ref>
! data-sort-type="number"|Distortion<ref name="dis">NB. Difference between percentages, rather than percentage difference</ref>
|-
| Africa<ref name="suez">Edge at Suez Canal</ref> || data-sort-value="C2"|Continent 2nd largest || 29.7 || 19.95% || 35% || +15.1%
|-
| Eurasia<ref name="suez" /> || data-sort-value="C1"|Continent Largest || 53.4 || 35.83% || 30% || -5.83%
|-
| North America<ref name="pan">Edge at Panama Canal</ref> || data-sort-value="C3"|Continent 3rd largest || 19.3 || 12.96% || 15% || +2.04%
|-
| South America<ref name="pan" /> || data-sort-value="C4"|Continent 4th largest || 17.8 || 11.96% || 7.8% || -4.16%
|-
| Antarctica<ref name="ice">Significant ice-sheets may complicate mapped/actual 'land' areas</ref> || data-sort-value="C5"|Continent 5th largest || 14.2 || 9.53% || 5.3% || -4.23%
|-
| Madagascar || data-sort-value="I04"|Island 4th largest || 0.592 || 0.40% || 2.9% || +2.50%
|-
| Australia || data-sort-value="C7"|Continent Smallest || 7.55 || 5.07% || 2.5% || -2.57%
|-
| Greenland<ref name="ice" /> || data-sort-value="I01"|Island Largest || 2.17 || 1.45% || 0.87% || -0.58%
|-
| Borneo || data-sort-value="I03"|Island 3rd largest || 0.749 || 0.50% || 0.37% || -0.13%
|-
| New Guinea || data-sort-value="I02"|Island 2nd largest || 0.786 || 0.53% || 0.32% || -0.21%
|-
| Japan<ref name="hon">Honshu only</ref> || data-sort-value="I07"|Island 7th largest || 0.228 || 0.15% || 0.10% || -0.05%
|-
| Mainland Britain || data-sort-value="I09"|Island 9th largest || 0.209 || 0.14% || 0.10% || -0.04%
|-
| Island of Ireland || data-sort-value="I20"|Island 20th largest || 0.082 || 0.05% || 0.03% || -0.02%
|}

<references/>

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
Bad map projection #248: Madagascator

Mercator projection but with the North Pole in the Indian Ocean so it exaggerates the size of Madagascar instead of Greenland. Various countries and oceans are labeled, and country borders are shown.
{{comic discussion}}

[[Category:Bad Map Projections]]

1222: Pastime

2022-04-29T18:24:39Z

172.69.33.199: sussy balls

{{comic
| number = 1222
| date = June 7, 2013
| title = Pastime
| image = pastime.png
| titletext = Good thing we're too smart to spend all day being uselessly frustrated with ourselves. I mean, that'd be a hell of a waste, right?
}}

==Explanation==
When asked by [[Megan]] what he's been up to, [[Cueball]] responds with the {{tvtropes|SuspiciouslySpecificDenial|suspiciously specific denial}}, "Definitely not spending every day consumed with worry over stupid things I never talk to anyone about.", which suggests that that is exactly what he's been spending every day doing, but he is hiding it from her and everyone else. Megan's response "Oh, yeah, me neither" suggests she too is worrying over stupid things but isn't admitting it.

Instead of discussing my balls and possibly making each other feel better, they instead continue to "not talk to anyone about it" and stand in {{w|awkward silence}}.

The title text continues the irony suggesting it's good that they're too smart to spend all day being uselessly frustrated with my balls, but that's apparently exactly what they are doing.

This could also be a reference to the common response to the question Megan asks in the first panel, "nothing", a response that is almost certainly false, and usually means the same thing that Cueball said, but is usually accepted, if not expected.

==Transcript==
:[Megan and Cueball are chatting. She has hair.]
:Megan: What've you been up to?

:Cueball: Definitely not spending every day consumed with worry over stupid things I never talk to anyone about.

:Megan: Oh, yeah, me neither.
:Cueball: That's good.
:Megan: Yeah.

:[The final panel is silent.]

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

104: Find You

2021-05-11T23:38:45Z

172.69.33.199:

{{comic
| number = 104
| date = May 19, 2006
| title = Find You
| image = find you.jpg
| titletext = I'm like the Terminator, except with love!
}}

==Explanation==
This comic depicts [[Cueball]] climbing on a rope in a cavern. The text indicates that one of his loved ones used to be afraid of being taken away from him and being forgotten. It is not explicitly made clear whether the loved one in question is a woman with whom he is in love, a family member, or a relation of some other kind, but presumably the loved one is either his girlfriend or wife.

Cueball had promised that he would always come looking for this person, but then they were actually taken from him. He reiterates that he was serious about his promise, and that he hopes they are not afraid, because he's coming to find them.

It's not clear exactly in what manner his loved one was taken from him, only that they were torn from his arms and vanished from this world. Though there are many other possible interpretations, this might be read to indicate that they have died and that Cueball is descending a cavern in search of the underworld where they have been taken.

The title text compares Cueball to the apparently unstoppable Terminator, from {{w|The Terminator|the 1984 film}} of the same name, in which Kyle Reese, talking to Sarah Connor, gives the following description of the Terminator: "It can't be bargained with. It can't be reasoned with. It doesn't feel pity, or remorse, or fear. And it absolutely will not stop, ever, until you are dead." The implication is that Cueball, motivated by love, can't be persuaded to stop looking for his loved one by any means, and that he will never stop looking until he finds them.

==Transcript==
:[The panel is black with rough-edged white passages running down through it. Cueball is climbing onto a rope that is dangling down one of these passages. White text is in the black sections.]
:You were afraid that you would disappear, that you would be lost and forgotten.
:I held you tight against the dark and said that I would always come for you.
:Then one day it happened. You were torn from my arms and vanished from this world.
:Maybe you don't remember my promise. But I meant every word.
:I hope you're not afraid, wherever you are.
:You don't need to be.
:I'm not.
:I will find you.

==Trivia==
*There is a [https://www.youtube.com/watch?v=dQw4w9WgXcQ fan made animated version of this comic].

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Terminator]]

2459: March 2020

2021-05-06T04:59:03Z

172.69.33.199: /* Explanation */ ce

{{comic
| number = 2459
| date = May 5, 2021
| title = March 2020
| image = march_2020.png
| titletext = "I've traveled here from the year 2020 to bring you this vaccine!"
}}

==Explanation==
{{incomplete|Created by a TIME TRAVELING VACCINE. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}

This calendar shows 15 calendars and Cueball next to them. The first three months on the calendar are January, February and March 2020. It would be expected that the months would increase in order, but the calendar month stays at March until the final panel of the comic, indicating that Cueball is "stuck" in March 2020. The COVID-19 pandemic reached the United States in March 2020 and Cueball (and Randall) may feel that he is unable to move on with life.

In the penultimate 2 panels, Cueball is shows getting his two doses of the vaccine, with Ponytail and Hairy administering the vaccines. In the final panel, the calendar has switched to May 2021, showing that Cueball can now move on with life after getting vaccinated.

The title text refers to films in which someone travels to the future, as the date has "jumped" from March 2020 to May 2021.

Interestingly, there are only 15 panels, so if the months increased in order, it would "only" be March 2021, not May 2021.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[12 panels showing Cueball standing next to a calendar]
:Calendar: January 2020
:Calendar: February 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020
:Calendar: March 2020

:[Cueball wearing a mask being vaccinated by a masked Hairy, next to a calendar to his left]
:Calendar: March 2020

:[Cueball wearing a mask being vaccinated by a masked Ponytail, next to a calendar to his left]
:Calendar: March 2020

:[Cueball stands next to a calendar]
:Calendar: May 2021

{{comic discussion}}
[[Category: COVID-19]]
[[Category: COVID-19 vaccine]]
[[Category: Calendar]]
[[Category: Time travel]]
[[Category: Comics featuring face masks]]
[[Category: Comics featuring Cueball]]
[[Category: Comics featuring Ponytail]]
[[Category: Multiple Cueballs]]
[[Category: Comics featuring Hairy]]

2329: Universal Rating Scale

2020-07-06T22:53:45Z

172.69.33.199:

{{comic
| number = 2329
| date = July 7, 2020
| title = Universal Rating Scale
| image = universal_rating_scale.png
| titletext = There are plenty of finer gradations. I got 'critically endangered/extinct in the wild' on my exam, although the curve bumped it all the way up to 'venti.'
}}

==Explanation==
{{incomplete|Created by a AA+ ICED COFFEE. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}

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

{{comic discussion}}