explain xkcd - User contributions [en]

2643: Cosmologist Gift

2022-07-09T00:12:26Z

172.69.34.6: /* Explanation */ 7.1e+10

{{comic
| number = 2643
| date = July 8, 2022
| title = Cosmologist Gift
| image = cosmologist_gift.png
| titletext = These neutrinos were freshly produced by a local source just 8 minutes ago
}}

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

According to this comic, "Cosmologists are easy to shop for because you can just get them a box." The example box allegedly contains 30,000 fresh neutrinos and 8 zeptograms of dark matter. The gift giver didn't put these things in the box; both are simply passing through it. There are about a billion {{w|neutrino}}s per cubic meter throughout space, produced during the {{w|Big Bang}}.[https://physics.mit.edu/news/journal/physicsatmit_14_conrad/] However, the flux of "freshly produced" {{w|solar neutrino}}s at Earth is around 7.1×1010/cm2/s.

Eight zeptograms is an infinitesimal amount equal to eight sextillionths of a gram. For comparison, Wolfram Alpha says it's equivalent to approximately 4800 daltons, which works out to the weight of about 400 carbon-12 atoms.

The "local source" mentioned in the title text is the Sun; it takes light (and neutrinos) 8 minutes to reach Earth once they're emitted.

Randall suggests that the neutrinos and dark matter in an empty box would make a good gift for a {{w|cosmologist}}. What anyone would ''do'' with 80,000 fresh neutrinos and 8 zeptograms of dark matter is open to speculation.

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

[A picture of a box with writing on one side]

Box:
30,000 NEUTRINOS
FRESHLY PRODUCED

PLUS 4 ZEPTOGRAMS
OF DARK MATTER

Caption: Cosmologists are easy to shop for because you can just get them a box.

{{comic discussion}}

2643: Cosmologist Gift

2022-07-09T00:10:09Z

172.69.34.6: /* Explanation */ expand

{{comic
| number = 2643
| date = July 8, 2022
| title = Cosmologist Gift
| image = cosmologist_gift.png
| titletext = These neutrinos were freshly produced by a local source just 8 minutes ago
}}

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

According to this comic, "Cosmologists are easy to shop for because you can just get them a box." The example box allegedly contains 30,000 fresh neutrinos and 8 zeptograms of dark matter. The gift giver didn't put these things in the box; both are simply passing through it. There are about a billion {{w|neutrino}}s per cubic meter throughout space, produced during the {{w|Big Bang}}.[https://physics.mit.edu/news/journal/physicsatmit_14_conrad/] However, the flux of "freshly produced" {{w|solar neutrino}}s at Earth is around 7.1/cm2/s.

Eight zeptograms is an infinitesimal amount equal to eight sextillionths of a gram. For comparison, Wolfram Alpha says it's equivalent to approximately 4800 daltons, which works out to the weight of about 400 carbon-12 atoms.

The "local source" mentioned in the title text is the Sun; it takes light (and neutrinos) 8 minutes to reach Earth once they're emitted.

Randall suggests that the neutrinos and dark matter in an empty box would make a good gift for a {{w|cosmologist}}. What anyone would ''do'' with 80,000 fresh neutrinos and 8 zeptograms of dark matter is open to speculation.

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

[A picture of a box with writing on one side]

Box:
30,000 NEUTRINOS
FRESHLY PRODUCED

PLUS 4 ZEPTOGRAMS
OF DARK MATTER

Caption: Cosmologists are easy to shop for because you can just get them a box.

{{comic discussion}}

2642: Meta-Alternating Current

2022-07-07T05:48:29Z

172.69.34.6: /* Explanation */ losses

{{comic
| number = 2642
| date = July 6, 2022
| title = Meta-Alternating Current
| image = meta_alternating_current.png
| titletext = It's always bothered me that you can't cancel out an inverter by putting a second inverter after it.
}}

==Explanation==
{{incomplete|Created by a CHAIN OF INVERTERS - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
This comic replaced [[No One Was Hurt]] as comic 2642 after the former was taken down from [[xkcd]]'s website.

In electronics, {{w|direct current}} is a constant flow of electrons from a power source to something being powered, before doubling back along the circuit. It is commonly used for battery-powered appliances. {{w|Alternating current}}, on the other hand, frequently reverses the flow of electrons, and is commonly used for longer-distance use (such as from the power plant to an outlet).

This comic proposes a humorous interspersion, ''Meta-Alternating Current'', which uses a series of adapters to "alternate" between DC and AC current. This is funny because since typical inverter efficiently is 90%, and the maximum {{w|bridge rectifier}} efficiency is 81.2%, an {{w|extension cord}} made of them would lose about 27% power per such pair.

The title text bemoans that an {{w|inverter}}, which converts direct current to alternating current, does not work in the other direction, as a layman's interpretation of the word "inverter" might appear. Rather, a separate device, a {{w|rectifier}}, also pictured in the comic, must be used for this second conversion.

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

{{comic discussion}}

Talk:2641: Mouse Turbines

2022-07-05T22:27:16Z

172.69.34.6: Hm

Is anybody going to try to calculate the amount of power such a turbine could collect? -- [[User:Dtgriscom|Dtgriscom]] ([[User talk:Dtgriscom|talk]]) 19:24, 4 July 2022 (UTC)
:Good idea; what should we use for an estimate of the geometry for https://www.omnicalculator.com/ecology/wind-turbine ? The final panel makes it look like the blade diameter is about twice the size of a fist. [https://www.sciencedirect.com/science/article/pii/S2215098616300830] says "exhaled air velocity varies from 2.2 m/s to 9.9 m/s (5.66 ± 1.57 m/s, mean ± SD) and exhalation time varies from 2.10 s to 8.21 s (4.42 ± 1.73s, mean ± SD)."
:I guessed 10 cm radius and used that mean breath speed. I should have used the top 9.9 m/s though, shouldn't I? [[Special:Contributions/172.70.214.185|172.70.214.185]] 20:56, 4 July 2022 (UTC)
:After a closer look at that article, the mean is more appropriate. [[Special:Contributions/172.70.206.95|172.70.206.95]] 21:19, 4 July 2022 (UTC)

Although these miniscule wind turbines don't generate much power, mice probably don't need much. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 21:17, 4 July 2022 (UTC)
:That's certainly a fair point. How much power would a mouse-sized fridge need? [[Special:Contributions/172.70.206.95|172.70.206.95]] 21:23, 4 July 2022 (UTC)
::Mice consume a lot more food per body weight (especially for body heat because heat transfer scales with surface area, not mass/volume) than humans. Mouse-sized fridge efficiency would also be poor both because of the same size issue and reduced room for insulation. [[User:627235|627235]] ([[User talk:627235|talk]]) 11:13, 5 July 2022 (UTC)
::A 480 ml insulin travel fridge uses 5 watts on a 3% duty cycle depending on the ambient temperature and how much it's loaded, so that's in the realm of possibility, and seems large enough. I used to feed lab mice about 5 grams of Purina Lab Rodent Chow daily, which was maybe 8ml volume, but it doesn't need to be refrigerated. Googling suggests field mice can get all the water they need from a diet of seeds. It seems to me that if mice could use electricity, they'd need it more in the winter than the summer. [[Special:Contributions/172.70.211.52|172.70.211.52]] 22:01, 5 July 2022 (UTC)

Someone please check my mouse energy needs math and assumptions. I made a couple misplaced decimal mistakes getting to where it is now, and I'm going to have another beer. [[Special:Contributions/172.70.211.52|172.70.211.52]] 22:17, 4 July 2022 (UTC)
:Not sure about numbers but some (if not most) energy requirements scale by surface area ({{w|Square–cube law}} or other measurements. There are also efficiency issues with at least lots of human-made miniature machines. [[User:627235|627235]] ([[User talk:627235|talk]]) 11:13, 5 July 2022 (UTC)
::What energy requirements scale by surface area? Pumping water, cooking, and refrigerating scales by mass. Converting footcandles to lumens depends on area, but that doesn't account for much lower mouse ceilings. [[Special:Contributions/172.69.34.6|172.69.34.6]] 22:27, 5 July 2022 (UTC)

I'm confused by the statement that smaller turbines are less "efficient". There's nothing about efficiency at that link. [[Special:Contributions/172.70.114.43|172.70.114.43]] 22:33, 4 July 2022 (UTC)
:The graph shows the ratio between size and output has risen from about half to 85%. What is a better term for this? I'm pretty sure one of the multiple definitions of efficiency is technically correct, but it can never hurt explaining better. [[Special:Contributions/172.69.33.113|172.69.33.113]] 22:42, 4 July 2022 (UTC)
:Changed to "relative power output" but I'm not sure that captures the idea very well either. [[Special:Contributions/172.69.33.113|172.69.33.113]] 22:44, 4 July 2022 (UTC)

Well wind turbines may not scale down ideally but still better than nuclear power plants. I suspect those have fixed minimal size and it's pretty big. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 23:32, 4 July 2022 (UTC)

:Apparently nuclear power can be [https://technology.nasa.gov/patent/LAR-TOPS-294 "as small as a button cell"] but mice are vulnerable to radioactive hazards, and haven't solved the waste disposal problem. [[Special:Contributions/172.70.214.185|172.70.214.185]] 23:45, 4 July 2022 (UTC)

Isn't the power output of a solar panel directly dependent on its size (and wether it's covered with snow, angle to the sun, clouds? And prolly something I'll think of as soon as I hit save).[[Special:Contributions/172.70.131.106|172.70.131.106]] 23:55, 4 July 2022 (UTC)
:Yes, but the power per size doesn't increase with size like wind turbines do. [[Special:Contributions/172.69.33.63|172.69.33.63]] 00:01, 5 July 2022 (UTC)

What is the smallest Tesla Powerwall available for purchase? [[Special:Contributions/172.70.206.163|172.70.206.163]] 02:00, 5 July 2022 (UTC)
:You probably want an {{w|18650}} or similar cell, which are [https://www.youtube.com/watch?v=PsJMj7FtroY frequently discarded on the street] and thus easily obtainable by mice. [[Special:Contributions/172.69.33.171|172.69.33.171]] 03:02, 5 July 2022 (UTC)

Why doesn't pico hydro have the same problems scaling down as wind? They're both fluid turbines. [[Special:Contributions/172.70.214.185|172.70.214.185]] 02:24, 5 July 2022 (UTC)
:For the same reasons that small fans have several vanes, but large wind turbines have only three. I remember reading something about the physics (it's a laminar versus turbulent thing) but I can't remember the details now. I'll update here if I can find it. [[Special:Contributions/172.70.210.125|172.70.210.125]] 03:08, 5 July 2022 (UTC)
:[https://www.sciencefocus.com/science/why-do-wind-turbines-have-three-blades/ Here's part of it,] but doesn't really get to the heart of the matter. [[Special:Contributions/172.70.210.125|172.70.210.125]] 03:10, 5 July 2022 (UTC)
:I think it has more to do with the relative magnitude of drag in gases instead of liquids. I don't have a good source though. [[Special:Contributions/172.70.211.36|172.70.211.36]] 03:21, 5 July 2022 (UTC)
::Turbine efficiency (especially for very small turbines) mostly depends on pressure differential and mass throughput. Water has three orders of magnitude higher density than air. Also, even with just a meter of water column, water offers a 10 kPa pressure differential while you only rarely get that much of a pressure differential in air (at the same height) even between areas of high and low pressure usually at least dozens (and commonly hundreds) of miles apart (there may be exceptions for things like tornadoes but good luck using their wind power), certainly not between the high and low pressure sides of a turbine. Efficiency in practice mostly depends on moved mass (of turbine blades, etc) compared to moved medium (water or air), friction (mount, generator, maybe a gearbox) compared to total power input and (if electricity is desired) generator efficiency which itself depends on generator size and rotation speed (hence the need for a gearbox). For a very small turbine, all those things would need to be extremely light as well. [[User:627235|627235]] ([[User talk:627235|talk]]) 11:13, 5 July 2022 (UTC)

Who is Beret Guy telling to make a wish - Megan or the mice? -- [[User:Ken g6|Ken g6]] ([[User talk:Ken g6|talk]]) 04:48, 5 July 2022 (UTC)

[https://www.cornel1801.com/animated/Secret-of-NIMH-1982/pictures/64.jpg I must tell you about NIMH.] - [[Special:Contributions/172.70.254.81|172.70.254.81]] 16:13, 5 July 2022 (UTC)

Talk:2640: The Universe by Scientific Field

2022-07-03T01:16:27Z

172.69.34.6: reply

I have a feeling reproductions of this particular XKCD will be popular on the doors of many offices in astronomy departments around the world. A bit like Gary Larson's Far Side cartoons are found everywhere in biology departments.

I just discovered Safari's "Live Text" feature. It allowed me to copy the numbers with all the digits, so I don't have to count them to create the transcript. But then someone else beat me to creating it. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 22:44, 1 July 2022 (UTC)

I wonder if we should mention the area of telescope apertures compared to, say, the surface area of all laboratory glassware or something like that. Too much of a stretch? [[Special:Contributions/172.70.214.81|172.70.214.81]] 23:18, 1 July 2022 (UTC)

“Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.”
― Douglas Adams, The Hitchhiker's Guide to the Galaxy
--[[Special:Contributions/162.158.129.117|162.158.129.117]] 00:40, 2 July 2022 (UTC)

Agreeing with the argument in the current version of the explanation as I write: it is really, really hard to argue that astronomy covers more than physics, which lays claim to including all the physical sciences as subfields. Also, is "field" a pun on the force fields of ... physics? [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 03:32, 2 July 2022 (UTC)
:I don't think most chemists would say that they're in a sub-field of physics, but chemistry is a huge part of astronomical spectroscopy. Similarly mathematicians relative to trigonometry. [[Special:Contributions/172.70.211.36|172.70.211.36]] 03:47, 2 July 2022 (UTC)

There's a bit of a problem here. Yes, Astronomy is the study of pretty much anything that isn't Earth. But the other part is pretty much limited to studies of life on earth (biology excluding exo-/astrobiology as well as pretty much all branches of social sciences), studies of earths atmosphere (meteorology and related fields), studies of earths water (e.g. hydrology as well as aspects of biology and others), studies of earths lithosphere (terrestrial geology and subfields) and various tangential branches thereof (like studies of earth's past - as part of pretty much any subject mentioned before). Fields like physics (pretty much everything "real", i.e. 100%), chemistry (any condensed matter) or geology (any rocky bits) have claims to various (already "taken") parts of the universe. Mathematics and philosophy (mentioned in alt text) don't have a claim to much of anything "real" in the universe (except maybe the pieces of data storage (paper, brain, digital) used) but have a claim to all of the (not "real, I guess) sciences mentioned before. Of course, that makes them subject to, at least, physics, chemistry, biology and social (including historical) sciences in turn. - - - TL/DR: I seem to be in a bit of a mood to kill jokes today. [[Special:Contributions/172.70.251.112|172.70.251.112]] 13:16, 2 July 2022 (UTC)
:of course to continue the joke, while all those fields may have applicability beyond earth, the vast majority of what they actually study is ON earth (although to make the stretch, you have to consider any field that studies things off earth as a subset of astronomy, which would make for many very angry scientific debates... hmmm... science thunderdome, I kinda like this idea =D [[Special:Contributions/172.69.71.127|172.69.71.127]] 15:05, 2 July 2022 (UTC)
:Don't feel bad. The entire second half of the explanation at present is devoted to casting the joke as absurdist exaggeration and hyperbole. [[Special:Contributions/172.70.211.36|172.70.211.36]] 15:30, 2 July 2022 (UTC)

Maybe the idea of the comic is that the diagram was created by astronomers to justify their existence, which explains the bias. Many lay people wonder why we spend so much money studying "out there" when there are so many problems here that could use the money (never mind that the fraction of government budgets devoted to astronomy is miniscule, and some of the discoveries do have terrestrial uses, particularly regarding climate change). And as alluded in the title text, other researchers could probably make a similar diagram that emphasizes their discipline. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 17:01, 2 July 2022 (UTC)
:Climate change? Only thing astronomy can tell us about climate change is where to move to when we inevitably destroy Earths climate. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 01:03, 3 July 2022 (UTC)
:: The greenhouse effect was originally described in terms of {{w|albedo}} when the absorption spectra of CO2 was first characterized, but I can't think of any other examples. [[Special:Contributions/172.69.34.6|172.69.34.6]] 01:16, 3 July 2022 (UTC)

2640: The Universe by Scientific Field

2022-07-02T02:44:57Z

172.69.34.6: /* Explanation */ a couple more wikilinks

{{comic
| number = 2640
| date = July 1, 2022
| title = The Universe by Scientific Field
| image = the_universe_by_scientific_field.png
| titletext = The math and philosophy people also claim everything, but the astronomers argue that the stuff they study really only comprises a small number of paper surfaces.
}}

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

{{w|Astronomy}} is the study of outer space and celestial phenomena. This comic makes a joke that most of the "universe" falls under the study of astronomy, which makes sense because it is so vast and large and is not studied directly by other fields of science.

The volume of the {{w|observable universe}} is 3.566×1080 cubic meters. The volume of Earth is 1.08321×1021 cubic meters.

1.08321×1021 m3 ÷ 3.566×1080 m3 × 100% ≈ 3×10-58%, which is scientific notation for the second of the two percentages, the first being its difference from 100%.

The title text says that mathematicians and philosophers claim that what they study also represents everything. But astronomers counter this by saying that they just study things that are written down, and this comprises just tiny amounts of "paper" on the Earth. This claim by mathematicians also appears in [[435: Purity]].

The information provided by {{w|Observational astronomy|astronomical observations}} of light, subatomic particles, and gravity's effects represents only a tiny fraction of the scientific properties of the extraterrestrial substances in the volume of space that astronomers study. Moreover, the adjacent fields of optics, physics, chemistry, mathematics, and geometry underpin almost all aspects of astronomy other than {{w|Astronomical naming conventions|nomenclature}}, so the comic may be seen as biased by proponents of those disciplines. Other objections could conceivably include the fact that almost everyone's subjective life experiences are overwhelmingly more involved with matters best described by fields other than astronomy, even in the case of professional astronomers (who often complain about how little time they can allocate to making actual astronomical observations) although this is to be expected as all but typically a handful of people are terrestrial.

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

:The Universe by Scientific Field

:[A pie chart is shown.]
:Astronomy
:99.9999999999999999999999999999999999999999999999999999999997%
:Other
:0.0000000000000000000000000000000000000000000000000000000003%

{{comic discussion}}

[[Category:Pie charts]]
[[Category:Science]]
[[Category:Astronomy]]
[[Category:Math]]
[[Category:Philosophy]]

2640: The Universe by Scientific Field

2022-07-02T02:41:12Z

172.69.34.6: /* Explanation */ merits a wikilink

{{comic
| number = 2640
| date = July 1, 2022
| title = The Universe by Scientific Field
| image = the_universe_by_scientific_field.png
| titletext = The math and philosophy people also claim everything, but the astronomers argue that the stuff they study really only comprises a small number of paper surfaces.
}}

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

{{w|Astronomy}} is the study of outer space and celestial phenomena. This comic makes a joke that most of the "universe" falls under the study of astronomy, which makes sense because it is so vast and large and is not studied directly by other fields of science.

The volume of the {{w|observable universe}} is 3.566×1080 cubic meters. The volume of Earth is 1.08321×1021 cubic meters.

1.08321×1021 m3 ÷ 3.566×1080 m3 × 100% ≈ 3×10-58%, which is scientific notation for the second of the two percentages, the first being its difference from 100%.

The title text says that mathematicians and philosophers claim that what they study also represents everything. But astronomers counter this by saying that they just study things that are written down, and this comprises just tiny amounts of "paper" on the Earth. This claim by mathematicians also appears in [[435: Purity]].

The information provided by astronomical observations of light, subatomic particles, and gravity's effects represents only a tiny fraction of the scientific properties of the extraterrestrial substances in the volume of space that astronomers study. Moreover, the adjacent fields of optics, physics, chemistry, mathematics, and geometry underpin almost all aspects of astronomy other than nomenclature, so the comic may be seen as biased by proponents of those disciplines. Other objections could conceivably include the fact that almost everyone's subjective life experiences are overwhelmingly more involved with matters best described by fields other than astronomy, even in the case of professional astronomers (who often complain about how little time they can allocate to making actual astronomical observations) although this is to be expected as all but typically a handful of people are terrestrial.

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

:The Universe by Scientific Field

:[A pie chart is shown.]
:Astronomy
:99.9999999999999999999999999999999999999999999999999999999997%
:Other
:0.0000000000000000000000000000000000000000000000000000000003%

{{comic discussion}}

[[Category:Pie charts]]
[[Category:Science]]
[[Category:Astronomy]]
[[Category:Math]]
[[Category:Philosophy]]

2640: The Universe by Scientific Field

2022-07-02T01:23:38Z

172.69.34.6: /* Explanation */ stand-in for matter and energy, good enough

{{comic
| number = 2640
| date = July 1, 2022
| title = The Universe by Scientific Field
| image = the_universe_by_scientific_field.png
| titletext = The math and philosophy people also claim everything, but the astronomers argue that the stuff they study really only comprises a small number of paper surfaces.
}}

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

{{w|Astronomy}} is the study of outer space and celestial phenomena. This comic makes a joke that most of the "universe" falls under the study of astronomy. Which makes sense because the "universe" is so vast and large and is not studied by other fields of science.

The volume of the observable universe is 3.566×1080 cubic meters. The volume of Earth is 1.08321×1021 cubic meters.

1.08321×1021 m3 ÷ 3.566×1080 m3 × 100% ≈ 3×10-58%, which is scientific notation for the second of the two percentages, the first being its difference from 100%.

The title text says that mathematicians and philosophers claim that what they study also represents everything. But astronomers counter this by saying that they just study things that are written down, and this comprises just tiny amounts of "paper" on the Earth. This claim by mathematicians is also used in [[435: Purity]].

The adjacent fields of optics, physics, chemistry, mathematics, and geometry underpin almost all aspects of astronomy other than nomenclature, so the comic may be seen as biased by proponents of those disciplines. Other objections may include the fact that almost all individual people's subjective life experiences are overwhelmingly more involved with matters best described by fields other than astronomy, even in the case of professional astronomers (who often complain about how little time they can allocate to making actual astronomical observations.) Furthermore, the information provided by astronomical observations of light, subatomic particles, and gravity's effects represents only a tiny fraction of the scientific properties of the extraterrestrial substances in the volume of space that astronomers study.

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

:The Universe by Scientific Field

:[A pie chart is shown.]
:Astronomy
:99.9999999999999999999999999999999999999999999999999999999997%
:Other
:0.0000000000000000000000000000000000000000000000000000000003%

{{comic discussion}}

[[Category:Pie charts]]
[[Category:Science]]
[[Category:Astronomy]]
[[Category:Math]]
[[Category:Philosophy]]

680: December 25th

2020-08-13T13:54:14Z

172.69.34.6: /* Explanation */

{{comic
| number =680
| date =December 25, 2009
| title =December 25th
| image =december_25th.png
| titletext =If you're turning 27 and were born in the Northeast, maybe you were conceived in the April blizzard of 1982. Imagine: snowed in, candles, massage oil, your mom sporting nothing but her early 80's haircut and a smile... aren't you glad you read the title-text?
}}

==Explanation==
On Christmas Day, most kids whose families celebrate the holiday get Christmas presents. And kids who were actually born on the 25th may feel a little put off because they don't get a special day all to themselves like their siblings and friends do. A lot of families alleviate this by celebrating the child's birthday on a day other than the 25th, so the kid will still get their own party. Unfortunately, the child may not get double presents, but may instead end up getting one gift per gift-giver as both a Christmas gift and a birthday gift.

In the title text, Randall provided a "lovely" image for the people turning 27 on this date (Christmas Day, 2009) that would surely have them reaching for the brain bleach.

==Transcript==
:[On one side, a family of four gathered around a Christmas tree, the daughter and son looking excitedly at the presents under the tree; on the other, a character wearing a party hat, sitting dejectedly before a birthday cake. The panel edges are decorated with holly and a wreath.]
:Happy Birthday to those of you born on the 25th!
:Sorry you get kinda shafted by the overlap with Christmas.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics with color]]
[[Category:Christmas]]
[[Category:Your Mom]]
[[Category:Multiple Cueballs]]

403: Convincing Pickup Line

2020-08-13T02:08:09Z

172.69.34.6: /* Explanation */ ce

{{comic
| number = 403
| date = March 31, 2008
| title = Convincing Pickup Line
| image = convincing pickup line.png
| titletext = Check it out; I've had sex with someone who's had sex with someone who's written a paper with Paul Erdős!
}}

==Explanation==
A {{w|graph (mathematics)|graph}} is a mathematical object consisting of '''nodes''' connected by lines called '''edges'''. The nodes could represent for example people, and the edges could represent a connection from having slept together. Now, Megan has such a graph. Arguably, a {{w|symmetric graph|graph that is symmetric}} is nicer than a regular one, which is why Megan suggests that they should sleep together.

The title text is a small-world joke on the concept of {{w|Erdős number}}. {{w|Paul Erdős}} was a Hungarian mathematician renowned for his eccentricity and productivity. He holds the world record for the number of published math papers, as well as for the number of collaborative papers. A person's Erdős number is the "collaborative distance" between the person and Erdős. Paul Erdős's Erdős number is 0 by definition. All of his 511 collaborators have the Erdős number of 1; anyone (excluding Erdős) who has collaborated on a mathematical or scientific paper with any of those collaborators has an Erdős number of 2, and so on. Thus, if you have written a paper with someone who's written a paper with someone who's written a paper with Paul Erdős, your Erdős number is 3. If you know a mathematician or are a mathematician you can calculate his/her/your Erdős number [http://www.ams.org/mathscinet/collaborationDistance.html here].

In [[599: Apocalypse]] Cueball actually manages to write a paper with zombie Erdős, thus having a Erdős number of 1.

==Transcript==
:[Cueball and Megan sit at a small table in a cafe. Megan holds up a graph.]
:Megan: We're a terrible match. But if we sleep together, it'll make the local hookup network a symmetric graph.
:Cueball: I can't argue with that.

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

1429: Data

2020-08-13T01:55:10Z

172.69.34.6: /* Transcript */ category

{{comic
| number = 1429
| date = October 3, 2014
| title = Data
| image = data.png
| titletext = If you want to have more fun at the expense of language pedants, try developing an hypercorrection habit.
}}

==Explanation==
"Kirk vs. Picard" is a debate that many ''{{w|Star Trek}}'' fans engage in — specifically which was a better captain of the {{w|Starship Enterprise|starship ''Enterprise''}} on the TV show. Captain {{w|James T. Kirk}} and {{w|Jean-Luc Picard}} each were captains of the ship in different periods (Kirk was captain of USS ''Enterprise'' (NCC-1701) in {{w|Star Trek: The Original Series|The Original Series}}, while Picard was captain of USS ''Enterprise''-D (NCC-1701-D) in ''{{w|Star Trek: The Next Generation|The Next Generation}}''), but fans argue over who was the "best". Most third-place candidates are pretty distant, resulting in a more multi-faceted debate. [[Cueball]] seems to be looking at results of polling for this ''third'' most popular character.

The humor in this comic stems from the fact that the Latin word ''data'' is a plural form of the word ''datum'' ‘a piece of information’, and that originally English followed Latin's lead and treated ''data'' as plural. However, in more recent English, usage of ''datum'' has faded to the extent that [http://statistics.about.com/od/Glossary/a/What-Is-The-Plural-Of-Data.htm ''data'' is treated as a collective noun]. This usage is becoming increasingly (but not universally) accepted as grammatically correct — the ''Wall Street Journal'', for instance, recently announced that it is moving away from saying "data are," while the ''New York Times''' manual of style allows for both variants depending on usage scenario; ''USA Today'', however, is consistently using ''data'' as a plural ("data are"). Naturally, the purists insist on the form that is correct from the Latin grammar point of view and see "data is" as an example of a subject-verb agreement error. This type of "error" is present in the beginning of the sentence that Cueball is citing ("According to this polling data," while certain traditionalists would hold that the grammatically correct variant would be "According to these polling data").

The second error in the same sentence is due to the fact that {{w|Data (Star Trek)|Data}} is a character from ''Star Trek: The Next Generation.'' Since it is a character's name, when used to refer to the character, "Data" should always be treated as singular.

By reversing the verb agreement in both cases, Cueball is going out of his way to annoy grammatically obsessed people.

The title text suggests the mocking of language pedants/amateur {{w|Grammar Nazi|grammar Nazis}} by {{w|Hypercorrection|hypercorrecting}} one's use of language. The sentence itself is an example of this:
*The general rule is that words starting with a consonant should be preceded by ''a,'' while words starting with a vowel should be preceded by ''an.'' However,
*The letter ''h'' is a special case, since in words like ''honor'' (/ˈɒnəɹ/) and ''hour'' (/ˈaʊəɹ/) the ''h'' is silent so the words actually start with a vowel sound, thus leading to the use of ''an.''
*Beyond this, there is a longstanding controversy over whether to use ''a'' or ''an'' with words that in some accents start with a silent ''h'' and in others they don't (see [http://boards.straightdope.com/sdmb/showthread.php?p=3328463#post3328463 Straightdope]). The [http://www.oxfordlearnersdictionaries.com/definition/english/historical?q=historical Oxford Learner's Dictionary] says about ''historical'': Some speakers do not pronounce the ‘h’ at the beginning of '''historical''' and use ‘an’ instead of ‘a’ before it. This now sounds old-fashioned.
*In the title text [[Randall]] adds the word ''hypercorrection'' to the list that includes ''historical'' and ''history''. In this invented accent, the pronunciation would be "ypercorrection".

This comic complements two of the [[:Category:My Hobby|My Hobbies]] comics [[326: Effect an Effect]] (which discusses the trolling of amateur grammar Nazis) and [[1405: Meteor]] (which mocks pedantry). This comic could also just as well have been labelled as one of Randall's Hobbies.

This comic also appears to be an example of {{w|self-irony}} as the author himself has previously exhibited certain inclination to insist on grammatically strict mode of usage of words loaned from Latin. One such example is the fact that [http://fora.xkcd.com/ xkcd's online discussion forums] are called ''fora'', which is a correct plural nominative form of ''forum'' in Latin.

==Transcript==
:[Cueball reading off a smart phone to someone off-screen.]
:Cueball: According to this polling data, after Kirk and Picard, the most popular Star Trek character are Data.
:Off-screen voice: ''Augh!''
:[Caption below the frame:]
:Annoy grammar pedants on all sides by making "data" singular '''except''' when referring to the android.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Star Trek]]
[[Category:Language]]
[[Category:Pedantic]]

1405: Meteor

2020-08-13T01:54:12Z

172.69.34.6: /* Transcript */ astronomy

{{comic
| number = 1405
| date = August 8, 2014
| title = Meteor
| image = meteor.png
| titletext = No, only LAVA is called 'magma' while underground. Any other object underground is called 'lava'.
}}

==Explanation==
This is one of [[Randall]]'s [[:Category:My Hobby|My Hobby]] comics. The author makes semantically incorrect statements to frustrate pedantic people who know the correct word, and confuse people who don't know the precise word so they can go on using the wrong word; see also [[1429: Data]]. Since Randall is normally personified by [[Cueball]], it makes most sense to call the one with the hobby Cueball in the explanation below.

Cueball's friend (who also looks like Cueball) walks up to Cueball and tells him that he has found a piece of a "{{w|meteor}}". Cueball corrects him by telling him that what he found is called {{w|magma}}, and that the phrase "a piece of a meteor" would be correct if the object was in the air, once it hits the ground it is called magma. In doing so he attempts to confuse or annoy his friend. In truth, {{w|meteorite}} is the expression for a piece of a {{w|meteoroid}} that has landed; {{w|meteor}} is the term for the streak of light caused by the meteoroid while it falls through the atmosphere. Thus the first statement by him is a (partly) true correction, but the second one is wrong.

The word "{{w|pedant}}ic" means being overly concerned with being precise. It is usually a pejorative term used to refer to someone who is overly fussy and corrects someone's word choice even when the more ambiguous or slightly incorrect term they used was fine for informal communication. One would tend to believe a pedant, as they would usually know what they are pedantic about. So when Cueball is making wrong statements that seem pedantic, he may make people believe him. A volcano that would be the bane of such a pedantic person was depicted in the last panel of [[1714: Volcano Types]], as a direct reference to this comic.

The title text expands on the joke, as if the conversation had continued with a confused friend responding that he thought magma was underground. Cueball attempts to confuse him further by talking about {{w|lava}} which indeed is the expression for magma that has reached the surface. But it's ridiculous to suggest that all other things are called lava when underground. In the sentence he also continues to imply that magma could also be found above ground.

The two sentences thus follow the same pattern with one true but pedantic part to begin with, and then a false statement to confuse the victim.

===Meteor & Magma===
Here is a list of the terminology that is being muddled:
*The descent of a small solid body from space:
**A {{w|meteoroid}} is a small solid body traveling through space outside the atmosphere.
**A {{w|meteor}} is a streak of light produced by a meteoroid as it burns up in the atmosphere.
**A {{w|meteorite}} is a piece of a meteoroid remaining after it strikes the ground.
*Molten rock:
**{{w|Magma}} flows underground.
**{{w|Lava}} has been extruded to a planet's surface, as through volcanic eruption.

A nice English mnemonic helps: In the void, meteoroid. On the site, meteorite. Neither/Nor: meteor.

==Transcript==
:[Cueballs friend walks toward Cueball while holding a rock.]
:Friend: Check it out - I got a piece of a meteor!
:Cueball: ''Actually'', it's only called that while falling. Once it lands, it's called ''magma''.

:[Below the panel:]
:My Hobby: Mixing pedantic terms

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Multiple Cueballs]]
[[Category:My Hobby]]
[[Category:Pedantic]]
[[Category:Volcanoes]] 
[[Category:Astronomy]]

2345: Wish on a Shooting Star

2020-08-13T01:51:47Z

172.69.34.6: /* Explanation */ cleanup

{{comic
| number = 2345
| date = August 12, 2020
| title = Wish on a Shooting Star
| image = wish_on_a_shooting_star.png
| titletext = Congratulations to whoever wished for revenge on a forest near the Tunguska River, a 1980 Chevy Malibu in Peekskill NY, Alabama resident Ann Hodges, every building in Chelyabinsk with glass windows, and the non-avian dinosaurs.
}}

==Explanation==
{{incomplete|Created by a NON-AVIAN DINOSAUR. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
It is a common practice to make a wish when one sees a shooting star, in hopes that the wish comes true. This comic consists of a [[:Category:Venn diagrams|Venn diagram]] showing what things are commonly wished for upon seeing a shooting star, and what things the shooting star may cause. Shooting stars, as they are actually meteors, can only cause changes to physical phenomena, such as radio noise or the appearance of the sky as they burn up in the upper atmosphere. The only thing that is shared between the potential wish side of the diagram and the shooting star caused side is revenge. This would occur when a shooting star actually hits the planet, becoming a meteorite. This is frequently highly destructive, given the high speed of falling meteors. As such, it would be possible for the meteorite to hit something that someone for some reason or another wished revenge upon. However, given the massive surface area of the planet, the likelihood that someone's revenge would be "granted" by a meteorite would be very low. The title text makes fun of this by detailing several incidents where a meteorite landed and caused damage.

List of things that were damaged by meteors (from title text):
* On June 30, 1908, an {{w|airburst}} caused by the {{w|Tunguska Event|breakup of a 100-meter falling meteorite or comet}} with the energy of some 30 megatons of {{w|TNT}} flattened some 80 million trees over 830 square miles of land in central {{w|Siberia}} near the {{w|Podkamennaya Tunguska|Tunguska River}}. Due to the remoteness of the area, no people were confirmed dead in the incident.
* On October 9, 1992, a meteorite {{w|Peekskill meteorite|damaged a 1980 Malibu in Peekskill, NY}}.
* On November 30, 1954, a {{w|Sylacauga (meteorite)|fragment of a meteorite}} passed through the roof of a house and struck Ann Hodges. She survived.
* On February 15, 2013, a meteor {{w|Chelyabinsk meteor|exploded in an airburst}} over Chelyabinsk, Russia, creating a shockwave that shattered windows in the area.
* The {{w|Cretaceous–Paleogene extinction event|extinction of the dinosaurs}} is believed to be caused by an {{w|Alvarez hypothesis|impact of a comet or asteroid}}. Randall mentions "non-avian" dinosaurs, as birds are descendants of dinosaurs, though they are not commonly thought of as dinosaurs.

Meteorites were most recently mentioned in [[2328: Space Basketball]].

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[A Venn diagram is shown:]

:[The left circle is labeled "Things people wish for" and contains:]
:Love
:Money
:Fame
:Health
:Power
:Luck
:Success

:[The right circle is labeled "Things shooting stars can cause" and contains:]
:Radio noise
:Dust and ionized gas in the upper atmosphere
:Infrasound
:Cool lights in the sky

:[The only item in the overlapping section is:]
:Revenge

{{comic discussion}}
[[Category:Astronomy]]
[[Category:Venn diagrams]]
[[Category:Comics featuring real people]]

2345: Wish on a Shooting Star

2020-08-13T01:49:56Z

172.69.34.6: /* Transcript */ ce

{{comic
| number = 2345
| date = August 12, 2020
| title = Wish on a Shooting Star
| image = wish_on_a_shooting_star.png
| titletext = Congratulations to whoever wished for revenge on a forest near the Tunguska River, a 1980 Chevy Malibu in Peekskill NY, Alabama resident Ann Hodges, every building in Chelyabinsk with glass windows, and the non-avian dinosaurs.
}}

==Explanation==
{{incomplete|Created by a NON-AVIAN DINOSAUR. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
It is a common practice to make a wish when one sees a shooting star, in hopes that the wish comes true. This comic consists of a [[:Category:Venn diagrams|Venn diagram]] showing what things are commonly wished for upon seeing a shooting star, and what things the shooting star may cause. Shooting stars, as they are actually meteors, can only cause changes to physical phenomena, such as radio noise or the appearance of the sky as they burn up in the upper atmosphere. The only thing that is shared between the potential wish side of the diagram and the shooting star caused side is revenge. This would occur when a shooting star actually hits the planet, becoming a meteorite. This is frequently highly destructive, given the high speed of falling meteors. As such, it would be possible for the meteorite to hit something that someone for some reason or another wished revenge upon. However, given the massive surface area of the planet, the likelihood that someone's revenge would be "granted" by a meteorite would be very low. The title text makes fun of this by detailing several incidents where a meteorite landed and caused damage ranging from a car to the {{w|Chicxulub impactor}} (which caused the death of non-avian dinosaurs).

The title text has a list of things that were damaged by meteors:
* On June 30, 1908, an {{w|airburst}} caused by the {{w|Tunguska Event|breakup of a 100-meter falling meteorite or comet}} with the energy of some 30 megatons of {{w|TNT}} flattened some 80 million trees over 830 square miles of land in central {{w|Siberia}} near the {{w|Podkamennaya Tunguska|Tunguska River}}. Due to the remoteness of the area, no people were confirmed dead in the incident.
* On October 9, 1992, a meteorite {{w|Peekskill meteorite|damaged a 1980 Malibu in Peekskill, NY}}.
* On November 30, 1954, a {{w|Sylacauga (meteorite)|fragment of a meteorite}} passed through the roof of a house and struck Ann Hodges. She survived.
* On February 15, 2013, a meteor {{w|Chelyabinsk meteor|exploded in an airburst}} over Chelyabinsk, Russia, creating a shockwave that shattered windows in the area.
* The {{w|Cretaceous–Paleogene extinction event|extinction of the dinosaurs}} is believed to be caused by an {{w|impact of a comet or asteroid}}. Randall mentions "non-avian" dinosaurs, as birds are descendants of dinosaurs, though they are not commonly thought of as dinosaurs.

Meteorites were also mentioned in [[2328: Space Basketball]].

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[A Venn diagram is shown:]

:[The left circle is labeled "Things people wish for" and contains:]
:Love
:Money
:Fame
:Health
:Power
:Luck
:Success

:[The right circle is labeled "Things shooting stars can cause" and contains:]
:Radio noise
:Dust and ionized gas in the upper atmosphere
:Infrasound
:Cool lights in the sky

:[The only item in the overlapping section is:]
:Revenge

{{comic discussion}}
[[Category:Astronomy]]
[[Category:Venn diagrams]]
[[Category:Comics featuring real people]]

2345: Wish on a Shooting Star

2020-08-13T01:49:20Z

172.69.34.6: /* Transcript */ cleanup

{{comic
| number = 2345
| date = August 12, 2020
| title = Wish on a Shooting Star
| image = wish_on_a_shooting_star.png
| titletext = Congratulations to whoever wished for revenge on a forest near the Tunguska River, a 1980 Chevy Malibu in Peekskill NY, Alabama resident Ann Hodges, every building in Chelyabinsk with glass windows, and the non-avian dinosaurs.
}}

==Explanation==
{{incomplete|Created by a NON-AVIAN DINOSAUR. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
It is a common practice to make a wish when one sees a shooting star, in hopes that the wish comes true. This comic consists of a [[:Category:Venn diagrams|Venn diagram]] showing what things are commonly wished for upon seeing a shooting star, and what things the shooting star may cause. Shooting stars, as they are actually meteors, can only cause changes to physical phenomena, such as radio noise or the appearance of the sky as they burn up in the upper atmosphere. The only thing that is shared between the potential wish side of the diagram and the shooting star caused side is revenge. This would occur when a shooting star actually hits the planet, becoming a meteorite. This is frequently highly destructive, given the high speed of falling meteors. As such, it would be possible for the meteorite to hit something that someone for some reason or another wished revenge upon. However, given the massive surface area of the planet, the likelihood that someone's revenge would be "granted" by a meteorite would be very low. The title text makes fun of this by detailing several incidents where a meteorite landed and caused damage ranging from a car to the {{w|Chicxulub impactor}} (which caused the death of non-avian dinosaurs).

The title text has a list of things that were damaged by meteors:
* On June 30, 1908, an {{w|airburst}} caused by the {{w|Tunguska Event|breakup of a 100-meter falling meteorite or comet}} with the energy of some 30 megatons of {{w|TNT}} flattened some 80 million trees over 830 square miles of land in central {{w|Siberia}} near the {{w|Podkamennaya Tunguska|Tunguska River}}. Due to the remoteness of the area, no people were confirmed dead in the incident.
* On October 9, 1992, a meteorite {{w|Peekskill meteorite|damaged a 1980 Malibu in Peekskill, NY}}.
* On November 30, 1954, a {{w|Sylacauga (meteorite)|fragment of a meteorite}} passed through the roof of a house and struck Ann Hodges. She survived.
* On February 15, 2013, a meteor {{w|Chelyabinsk meteor|exploded in an airburst}} over Chelyabinsk, Russia, creating a shockwave that shattered windows in the area.
* The {{w|Cretaceous–Paleogene extinction event|extinction of the dinosaurs}} is believed to be caused by an {{w|impact of a comet or asteroid}}. Randall mentions "non-avian" dinosaurs, as birds are descendants of dinosaurs, though they are not commonly thought of as dinosaurs.

Meteorites were also mentioned in [[2328: Space Basketball]].

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[A Venn diagram is shown:]

:[The left circle is labeled "Things people wish for" and contains:]
:Love
:Money
:Fame
:Health
:Luck
:Power
:Success

:[The right circle is labeled "Things shooting stars can cause" and contains:]
:Radio noise
:Dust and ionized gas in the upper atmosphere
:Infrasound
:Cool lights in the sky

:[The only item in the overlapping section is:]
:Revenge

{{comic discussion}}
[[Category:Astronomy]]
[[Category:Venn diagrams]]
[[Category:Comics featuring real people]]

2345: Wish on a Shooting Star

2020-08-13T01:45:46Z

172.69.34.6: /* Transcript */ categories

{{comic
| number = 2345
| date = August 12, 2020
| title = Wish on a Shooting Star
| image = wish_on_a_shooting_star.png
| titletext = Congratulations to whoever wished for revenge on a forest near the Tunguska River, a 1980 Chevy Malibu in Peekskill NY, Alabama resident Ann Hodges, every building in Chelyabinsk with glass windows, and the non-avian dinosaurs.
}}

==Explanation==
{{incomplete|Created by a NON-AVIAN DINOSAUR. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
It is a common practice to make a wish when one sees a shooting star, in hopes that the wish comes true. This comic consists of a [[:Category:Venn diagrams|Venn diagram]] showing what things are commonly wished for upon seeing a shooting star, and what things the shooting star may cause. Shooting stars, as they are actually meteors, can only cause changes to physical phenomena, such as radio noise or the appearance of the sky as they burn up in the upper atmosphere. The only thing that is shared between the potential wish side of the diagram and the shooting star caused side is revenge. This would occur when a shooting star actually hits the planet, becoming a meteorite. This is frequently highly destructive, given the high speed of falling meteors. As such, it would be possible for the meteorite to hit something that someone for some reason or another wished revenge upon. However, given the massive surface area of the planet, the likelihood that someone's revenge would be "granted" by a meteorite would be very low. The title text makes fun of this by detailing several incidents where a meteorite landed and caused damage ranging from a car to the {{w|Chicxulub impactor}} (which caused the death of non-avian dinosaurs).

The title text has a list of things that were damaged by meteors:
* On June 30, 1908, an {{w|airburst}} caused by the {{w|Tunguska Event|breakup of a 100-meter falling meteorite or comet}} with the energy of some 30 megatons of {{w|TNT}} flattened some 80 million trees over 830 square miles of land in central {{w|Siberia}} near the {{w|Podkamennaya Tunguska|Tunguska River}}. Due to the remoteness of the area, no people were confirmed dead in the incident.
* On October 9, 1992, a meteorite {{w|Peekskill meteorite|damaged a 1980 Malibu in Peekskill, NY}}.
* On November 30, 1954, a {{w|Sylacauga (meteorite)|fragment of a meteorite}} passed through the roof of a house and struck Ann Hodges. She survived.
* On February 15, 2013, a meteor {{w|Chelyabinsk meteor|exploded in an airburst}} over Chelyabinsk, Russia, creating a shockwave that shattered windows in the area.
* The {{w|Cretaceous–Paleogene extinction event|extinction of the dinosaurs}} is believed to be caused by an {{w|impact of a comet or asteroid}}. Randall mentions "non-avian" dinosaurs, as birds are descendants of dinosaurs, though they are not commonly thought of as dinosaurs.

Meteorites were also mentioned in [[2328: Space Basketball]].

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
A Venn Diagram is shown. 
Things people wish for:
*Love
*Money
*Fame
*Health
*Luck
*Power
*Success
Things shooting stars can cause:
*Radio Noise
*Dust and ionized gas in the upper atmosphere
*Infrasound
*Cool lights in the sky
Both:
*Revenge
{{comic discussion}}
[[Category:Astronomy]]
[[Category:Venn diagrams]]
[[Category:Comics featuring real people]]

2345: Wish on a Shooting Star

2020-08-13T01:45:05Z

172.69.34.6: /* Explanation */ more

{{comic
| number = 2345
| date = August 12, 2020
| title = Wish on a Shooting Star
| image = wish_on_a_shooting_star.png
| titletext = Congratulations to whoever wished for revenge on a forest near the Tunguska River, a 1980 Chevy Malibu in Peekskill NY, Alabama resident Ann Hodges, every building in Chelyabinsk with glass windows, and the non-avian dinosaurs.
}}

==Explanation==
{{incomplete|Created by a NON-AVIAN DINOSAUR. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
It is a common practice to make a wish when one sees a shooting star, in hopes that the wish comes true. This comic consists of a [[:Category:Venn diagrams|Venn diagram]] showing what things are commonly wished for upon seeing a shooting star, and what things the shooting star may cause. Shooting stars, as they are actually meteors, can only cause changes to physical phenomena, such as radio noise or the appearance of the sky as they burn up in the upper atmosphere. The only thing that is shared between the potential wish side of the diagram and the shooting star caused side is revenge. This would occur when a shooting star actually hits the planet, becoming a meteorite. This is frequently highly destructive, given the high speed of falling meteors. As such, it would be possible for the meteorite to hit something that someone for some reason or another wished revenge upon. However, given the massive surface area of the planet, the likelihood that someone's revenge would be "granted" by a meteorite would be very low. The title text makes fun of this by detailing several incidents where a meteorite landed and caused damage ranging from a car to the {{w|Chicxulub impactor}} (which caused the death of non-avian dinosaurs).

The title text has a list of things that were damaged by meteors:
* On June 30, 1908, an {{w|airburst}} caused by the {{w|Tunguska Event|breakup of a 100-meter falling meteorite or comet}} with the energy of some 30 megatons of {{w|TNT}} flattened some 80 million trees over 830 square miles of land in central {{w|Siberia}} near the {{w|Podkamennaya Tunguska|Tunguska River}}. Due to the remoteness of the area, no people were confirmed dead in the incident.
* On October 9, 1992, a meteorite {{w|Peekskill meteorite|damaged a 1980 Malibu in Peekskill, NY}}.
* On November 30, 1954, a {{w|Sylacauga (meteorite)|fragment of a meteorite}} passed through the roof of a house and struck Ann Hodges. She survived.
* On February 15, 2013, a meteor {{w|Chelyabinsk meteor|exploded in an airburst}} over Chelyabinsk, Russia, creating a shockwave that shattered windows in the area.
* The {{w|Cretaceous–Paleogene extinction event|extinction of the dinosaurs}} is believed to be caused by an {{w|impact of a comet or asteroid}}. Randall mentions "non-avian" dinosaurs, as birds are descendants of dinosaurs, though they are not commonly thought of as dinosaurs.

Meteorites were also mentioned in [[2328: Space Basketball]].

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
A Venn Diagram is shown. 
Things people wish for:
*Love
*Money
*Fame
*Health
*Luck
*Power
*Success
Things shooting stars can cause:
*Radio Noise
*Dust and ionized gas in the upper atmosphere
*Infrasound
*Cool lights in the sky
Both:
*Revenge
{{comic discussion}}

2345: Wish on a Shooting Star

2020-08-12T23:02:48Z

172.69.34.6: Added link to the 1980-malibu reference

2284: Sabotage

2020-03-25T03:51:44Z

172.69.34.6: /* Explanation */ ce

{{comic
| number = 2284
| date = March 23, 2020
| title = Sabotage
| image = sabotage.png
| titletext = So excited to see everyone after my luxury cruise home from the World Handshake Championships!
}}

==Explanation==
{{incomplete|Created by a WILD SKUNK WITH CORONAVIRUS. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}

This comic, once again, returns to the subject of "the [[:Category:COVID-19|coronavirus]]" (specifically the strain designated as SARS CoV-2).

In the wake of the virus, the advice from many professionals in the United States is to avoid public gatherings to slow the spread of the virus and "flatten the curve".

In this comic, some group of people (we're not told who) are planning a public event, which is very much contrary to the widespread professional advice, and puts everyone at risk by accelerating the spread of the virus in the general population. In an effort to sabotage this event by deterring people from attending, [[Cueball]] applies reverse psychology, pretending to be enthusiastically planning various activities at the gathering that most people would go out of their way to avoid: a wild skunk petting zoo, which would most likely result in everyone getting heavily sprayed with violently foul-smelling skunk scent{{Citation needed}}, which wild skunks use to drive away predators; and {{w|karaoke}} featuring the song "{{w|Baby Shark}}", which is a song for small children that is generally considered annoying to adults, made even more direly annoying in this case by being spoken rather than sung.

In the title text, Cueball has stepped up his game from merely threatening to spoil everyone's fun to making them fear that they might get infected. He claims to have attended a "World Handshake Championships", which presumably would involve shaking hands with as many people as possible; this would facilitate the spread of diseases such as COVID-19. He furthermore claims to have traveled home from the championship via a cruise ship, which may also cause concern because cruise ships are known for their densely populated environments and lack of extensive medical facilities making prevention and treatment of infections very difficult or impossible. Cruise ships have been a recent topic of interest in relation to SARS CoV-2 due to many people being stranded at sea with infected patients because of COVID-19 outbreaks on board.

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

:[Cueball is seated at a desk, typing on a laptop. The top half of the image is the text he is typing in a reply message:]
:"I see you're still getting together today! I'll be there, doing my spoken-word ''Baby Shark'' karaoke all evening.
:We'll also be setting up a petting zoo for the kids. We've spent all week trapping wild skunks!"
:[Below the text is a white-on-green "reply" button.]

:[Caption below the panel:]
:In the coronavirus era, desperate times call for desperate measures.

{{comic discussion}}

[[Category:Comics with color]]
[[Category:COVID-19]]
[[Category:Comics featuring Cueball]]

1908: Credit Card Rewards

2018-01-23T19:00:11Z

172.69.34.6: /* Explanation */

{{comic
| number = 1908
| date = October 27, 2017
| title = Credit Card Rewards
| image = credit_card_rewards.png
| titletext = I should make a list of all the things I could be trying to optimize, prioritized by ... well, I guess there are a few different variables I could use. I'll create a spreadsheet ...
}}

==Explanation==
{{incomplete|VERY basic explanation.}}

A credit card, at its most basic form, is a loan contract to an individual from a bank. Like all contracts, the bank will offer several different types in an attempt to appeal to a large number of individuals. Unlike traditional loans which focus on a single item (car, house, boat, etc), a credit card is an unsecured loan geared towards daily and weekly transactions. Because these transactions cover a wide variety of items, credit cards can be further tweaked towards offering benefits in certain areas. For example, gas purchases, or even gas purchases through a single retail chain, can offer higher rewards on one type of plan vs. other plans.

These benefits, typically called rewards, have several different options. "Cash back" is a reward where the individual is given money back when they make a purchase that follows certain rules spelled out in the contract. "No interest" is a reward where the individual is not charged interest on their purchases if they pay the loaned money back within a specified amount of time. "Points" are similar to the cash back program, but are typically reserved towards purchasing a single large item or plan. Points towards a vacation is a popular option. Besides these three types of rewards, the number of actual rewards to pick from are limited only by the creativity and fiscal limitations of the issuing bank's CEO.

Cueball is trying to choose the optimal credit card program (the one that will result in biggest savings with the yearly fiscal median (YFM) he has. He realizes that he has to subtract the cost of him spending time on optimizing, so he wants to optimize the time needed to do the optimizing. But in order to to that efficiently, he first has to optimize the time spent on optimizing the time.

Hairy notices a hidden assumption that Cueball will spend his time on something more productive than this (i.e. that his time has value); Cueball's obsession with optimization is lame enough to suggest that he does not actually have more worthwhile interests to pursue. Cueball responds that he can "fail to optimize so many better things!" This means that Cueball is aware both of the big flaw in his reasoning and the fact that, when he attempts to optimize things, the attempt seldom really helps his situation.

The title text further expands the idea. Cueball wants to present a list of things to optimize to Hairy. However, he still needs to optimize the priorities of that list, before optimizing the list itself. Making and working with lists like this often involves a spreadsheet, which may also be a reference to [[1906: Making Progress]].

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

:[Cueball sits at a desk and is on his laptop. Hairy stands behind him.]
:Cueball: I'm trying to figure out which of these credit card rewards programs is best given my spending.

:[Cueball leans backwards in a frameless panel.]
:Cueball: But at some point, the cost of the time it takes me to understand the options outweighs their difference in value.

:[Close-up of Cueball's head and torso.]
:Cueball: So I need to figure out where that point is, and stop before I reach it.
:Cueball: But... when I factor in the time to calculate THAT, it changes the overall answer.

:[Cueball has his arms outstretched.]
:Hairy: I question the assumption that you'd otherwise be spending your time on something more valuable.
:Cueball: Come on, I could be failing to optimize so many better things!

{{comic discussion}}

[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Cueball]]
[[Category:Time management]]