explain xkcd - User contributions [en]

2869: Puzzles

2023-12-20T02:48:58Z

Mat0329Lo: Undo revision 331176 by Mat0329Lo (talk)

{{comic
| number = 2869
| date = December 18, 2023
| title = Puzzles
| image = puzzles_2x.png
| imagesize = 328x455px
| noexpand = true
| titletext = Why couldn't the amulet have been hidden by Aunt Alice, who understands modern key exchange algorithms?
}}

==Explanation==
{{incomplete|Created by AUNT '''A'''MY, AS IN AN '''A'''WFUL CLUE FROM A CHILDREN'S BOOK - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

The characters in the panel are contemplating a riddle. Considering words that share the same letter as the propagator of the riddle, they decide that they must dig a hole in the yard. This leads us to Randall's point — that these connections made by the characters are tenuous at best and are unreasonable to make, especially as part of a riddle.

The comic explains that some of the books that Randall read as a kid had horrible puzzles. It lists a (fake?) example about Aunt Gertrude's amulet, which the characters guess is hidden in the Ground because that starts with a G, like Gertrude, and that they should diG a hole. These guesses are unreasonable unless the answer is already known. (It is supposedly not already known by the characters.) There are several other unrelated words that begin with G, such as Gulf, or Gull, or Go-Get-a-plane-and-fly-to-Greenland. On top of that, it is ambiguous (though both would seem unlikely) whether the supposed/nominal ’Aunt’ either:
#Chose to be known as a G-name by everyone (or at least these children) as an indeterminately long-standing plan to eventually allow the possible reveal of an existing underground hiding place, or
#Was inspired by her own actual name to choose a (vaguely) compatible method of concealment.

Moreover, once deciding that this "clue" is telling them to dig a hole in the ground, the search is not significantly narrowed as the world is a big place and "underground, somewhere" leaves a huge range of possible locations. You may need {{tvtropes|XMarksTheSpot|at least one more letter}} to narrow the options down.

Aunt Gertrude is a character in the once-popular Hardy Boys childrens' mystery series by Franklin W. Dixon. Main characters Frank and Joe Hardy frequently had to decipher clues to find hidden objects.

The children's books from the 1970s and before were uniformly terrible in their puzzles. Especially as it was probably only much later that you realised that the problem was the writer and the puzzles, not you the reader. Many only realised this on rereading the books as an adult, perhaps when reading them to their own children. '''''This explanation should be fleshed out by scores of examples, not just Hardy boys...'''''

The title text references {{w|Alice and Bob|Alice}}, a fictional character commonly used in discussions about cryptography. In those discussions, Alice is often sending and receiving encrypted messages, and she would be expected to be able to make a better puzzle than the one shown in the comic. Alice and Bob and other characters from the same set have been mentioned previously in xkcd, like in [[177: Alice and Bob]]. Using modern cryptography in lieu of riddles in children's stories was also mentioned in [[370: Redwall]].

==Transcript==
:[Possibly teenage versions of Hairy, Jill, Ponytail, and Cueball, listed from left to right, are standing in a line. Hairy is in a thinking pose, Jill faces Hairy, and Ponytail and Cueball are walking to the right; Cueball is pointing off-panel.]
:Hairy: Aunt Gertrude must have left a clue to the amulet's location.
:Jill: Hmm. Wait a minute.
:Jill: '''G'''ertrude. '''G'''.
:Hairy: As in "'''G'''round!"
:Jill: And "di'''G''' a hole!"
:Ponytail: I'll get a shovel!
:Cueball: To the yard!

:[Caption below the panel:]
:Some of the authors of books I read as a kid were '''''terrible''''' at designing puzzles.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Jill]]
[[Category:Comics featuring Ponytail]]
[[Category:Cryptography]]
[[Category:Kids]]

2869: Puzzles

2023-12-20T02:48:43Z

Mat0329Lo: Undo revision 331177 by Mat0329Lo (talk)

{{comic
| number = 2869
| date = December 18, 2023
| title = Puzzles
| image = puzzles_2x.png
| imagesize = 328x455px
| noexpand = true
| titletext = Why couldn't the amulet have been hidden by Aunt Alice, who understands modern key exchange algorithms?
}}

==Explanation==
{{incomplete|Created by AUNT '''A'''MY, AS IN AN '''A'''WFUL CLUE FROM A CHILDREN'S BOOK - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

The characters in the panel are contemplating a riddle. Considering words that share the same letter as the propagator of the riddle, they decide that they must dig a hole in the yard. This leads us to Randall's point — that these connections made by the characters are tenuous at best and are unreasonable to make, especially as part of a riddle.

The comic explains that some of the books that Randall read as a kid had horrible puzzles. It lists a (fake?) example about Aunt Gertrude's amulet, which the characters guess is hidden in the Ground because that starts with a G, like Gertrude, and that they should diG a hole. These guesses are unreasonable unless the answer is already known. (It is supposedly not already known by the characters.) There are several other unrelated words that begin with G, such as Gulf, or Gull, or Go-Get-a-plane-and-fly-to-Greenland. On top of that, it is ambiguous (though both would seem unlikely) whether the supposed/nominal ’Aunt’ either:
#Chose to be known as a G-name by everyone (or at least these children) as an indeterminately long-standing plan to eventually allow the possible reveal of an existing underground hiding place, or
#Was inspired by her own actual name to choose a (vaguely) compatible method of concealment.

Moreover, once deciding that this "clue" is telling them to dig a hole in the ground, the search is not significantly narrowed as the world is a big place and "underground, somewhere" leaves a huge range of possible locations. You may need {{tvtropes|XMarksTheSpot|at least one more letter}} to narrow the options down.

Aunt Gertrude is a character in the once-popular Hardy Boys childrens' mystery series by Franklin W. Dixon. Main characters Frank and Joe Hardy frequently had to decipher clues to find hidden objects.

The children's books from the 1970s and before were uniformly terrible in their puzzles. Especially as it was probably only much later that you realised that the problem was the writer and the puzzles, not you the reader. Many only realised this on rereading the books as an adult, perhaps when reading them to their own children. <!--This explanation should be fleshed out by scores of examples, not just Hardy boys...--!>

The title text references {{w|Alice and Bob|Alice}}, a fictional character commonly used in discussions about cryptography. In those discussions, Alice is often sending and receiving encrypted messages, and she would be expected to be able to make a better puzzle than the one shown in the comic. Alice and Bob and other characters from the same set have been mentioned previously in xkcd, like in [[177: Alice and Bob]]. Using modern cryptography in lieu of riddles in children's stories was also mentioned in [[370: Redwall]].

==Transcript==
:[Possibly teenage versions of Hairy, Jill, Ponytail, and Cueball, listed from left to right, are standing in a line. Hairy is in a thinking pose, Jill faces Hairy, and Ponytail and Cueball are walking to the right; Cueball is pointing off-panel.]
:Hairy: Aunt Gertrude must have left a clue to the amulet's location.
:Jill: Hmm. Wait a minute.
:Jill: '''G'''ertrude. '''G'''.
:Hairy: As in "'''G'''round!"
:Jill: And "di'''G''' a hole!"
:Ponytail: I'll get a shovel!
:Cueball: To the yard!

:[Caption below the panel:]
:Some of the authors of books I read as a kid were '''''terrible''''' at designing puzzles.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Jill]]
[[Category:Comics featuring Ponytail]]
[[Category:Cryptography]]
[[Category:Kids]]

2869: Puzzles

2023-12-20T02:47:04Z

Mat0329Lo:

{{comic
| number = 2869
| date = December 18, 2023
| title = Puzzles
| image = puzzles_2x.png
| imagesize = 328x455px
| noexpand = true
| titletext = Why couldn't the amulet have been hidden by Aunt Alice, who understands modern key exchange algorithms?
}}

==Explanation==
{{incomplete|Created by AUNT '''A'''MY, AS IN AN '''A'''WFUL CLUE FROM A CHILDREN'S BOOK - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

The characters in the panel are contemplating a riddle. Considering words that share the same letter as the propagator of the riddle, they decide that they must dig a hole in the yard. This leads us to Randall's point — that these connections made by the characters are tenuous at best and are unreasonable to make, especially as part of a riddle.

The comic explains that some of the books that Randall read as a kid had horrible puzzles. It lists a (fake?) example about Aunt Gertrude's amulet, which the characters guess is hidden in the Ground because that starts with a G, like Gertrude, and that they should diG a hole. These guesses are unreasonable unless the answer is already known. (It is supposedly not already known by the characters.) There are several other unrelated words that begin with G, such as Gulf, or Gull, or Go-Get-a-plane-and-fly-to-Greenland. On top of that, it is ambiguous (though both would seem unlikely) whether the supposed/nominal ’Aunt’ either:
#Chose to be known as a G-name by everyone (or at least these children) as an indeterminately long-standing plan to eventually allow the possible reveal of an existing underground hiding place, or
#Was inspired by her own actual name to choose a (vaguely) compatible method of concealment.

Moreover, once deciding that this "clue" is telling them to dig a hole in the ground, the search is not significantly narrowed as the world is a big place and "underground, somewhere" leaves a huge range of possible locations. You may need {{tvtropes|XMarksTheSpot|at least one more letter}} to narrow the options down.

Aunt Gertrude is a character in the once-popular Hardy Boys childrens' mystery series by Franklin W. Dixon. Main characters Frank and Joe Hardy frequently had to decipher clues to find hidden objects.

The children's books from the 1970s and before were uniformly terrible in their puzzles. Especially as it was probably only much later that you realised that the problem was the writer and the puzzles, not you the reader. Many only realised this on rereading the books as an adult, perhaps when reading them to their own children. <!--This explanation should be fleshed out by scores of examples, not just Hardy boys...---!>

The title text references {{w|Alice and Bob|Alice}}, a fictional character commonly used in discussions about cryptography. In those discussions, Alice is often sending and receiving encrypted messages, and she would be expected to be able to make a better puzzle than the one shown in the comic. Alice and Bob and other characters from the same set have been mentioned previously in xkcd, like in [[177: Alice and Bob]]. Using modern cryptography in lieu of riddles in children's stories was also mentioned in [[370: Redwall]].

==Transcript==
:[Possibly teenage versions of Hairy, Jill, Ponytail, and Cueball, listed from left to right, are standing in a line. Hairy is in a thinking pose, Jill faces Hairy, and Ponytail and Cueball are walking to the right; Cueball is pointing off-panel.]
:Hairy: Aunt Gertrude must have left a clue to the amulet's location.
:Jill: Hmm. Wait a minute.
:Jill: '''G'''ertrude. '''G'''.
:Hairy: As in "'''G'''round!"
:Jill: And "di'''G''' a hole!"
:Ponytail: I'll get a shovel!
:Cueball: To the yard!

:[Caption below the panel:]
:Some of the authors of books I read as a kid were '''''terrible''''' at designing puzzles.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Jill]]
[[Category:Comics featuring Ponytail]]
[[Category:Cryptography]]
[[Category:Kids]]

2869: Puzzles

2023-12-20T02:46:32Z

Mat0329Lo:

{{comic
| number = 2869
| date = December 18, 2023
| title = Puzzles
| image = puzzles_2x.png
| imagesize = 328x455px
| noexpand = true
| titletext = Why couldn't the amulet have been hidden by Aunt Alice, who understands modern key exchange algorithms?
}}

==Explanation==
{{incomplete|Created by AUNT '''A'''MY, AS IN AN '''A'''WFUL CLUE FROM A CHILDREN'S BOOK - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

The characters in the panel are contemplating a riddle. Considering words that share the same letter as the propagator of the riddle, they decide that they must dig a hole in the yard. This leads us to Randall's point — that these connections made by the characters are tenuous at best and are unreasonable to make, especially as part of a riddle.

The comic explains that some of the books that Randall read as a kid had horrible puzzles. It lists a (fake?) example about Aunt Gertrude's amulet, which the characters guess is hidden in the Ground because that starts with a G, like Gertrude, and that they should diG a hole. These guesses are unreasonable unless the answer is already known. (It is supposedly not already known by the characters.) There are several other unrelated words that begin with G, such as Gulf, or Gull, or Go-Get-a-plane-and-fly-to-Greenland. On top of that, it is ambiguous (though both would seem unlikely) whether the supposed/nominal ’Aunt’ either:
#Chose to be known as a G-name by everyone (or at least these children) as an indeterminately long-standing plan to eventually allow the possible reveal of an existing underground hiding place, or
#Was inspired by her own actual name to choose a (vaguely) compatible method of concealment.

Moreover, once deciding that this "clue" is telling them to dig a hole in the ground, the search is not significantly narrowed as the world is a big place and "underground, somewhere" leaves a huge range of possible locations. You may need {{tvtropes|XMarksTheSpot|at least one more letter}} to narrow the options down.

Aunt Gertrude is a character in the once-popular Hardy Boys childrens' mystery series by Franklin W. Dixon. Main characters Frank and Joe Hardy frequently had to decipher clues to find hidden objects.

The children's books from the 1970s and before were uniformly terrible in their puzzles. Especially as it was probably only much later that you realised that the problem was the writer and the puzzles, not you the reader. Many only realised this on rereading the books as an adult, perhaps when reading them to their own children. <!--This explanation should be fleshed out by scores of examples, not just Hardy boys...--!>

The title text references {{w|Alice and Bob|Alice}}, a fictional character commonly used in discussions about cryptography. In those discussions, Alice is often sending and receiving encrypted messages, and she would be expected to be able to make a better puzzle than the one shown in the comic. Alice and Bob and other characters from the same set have been mentioned previously in xkcd, like in [[177: Alice and Bob]]. Using modern cryptography in lieu of riddles in children's stories was also mentioned in [[370: Redwall]].

==Transcript==
:[Possibly teenage versions of Hairy, Jill, Ponytail, and Cueball, listed from left to right, are standing in a line. Hairy is in a thinking pose, Jill faces Hairy, and Ponytail and Cueball are walking to the right; Cueball is pointing off-panel.]
:Hairy: Aunt Gertrude must have left a clue to the amulet's location.
:Jill: Hmm. Wait a minute.
:Jill: '''G'''ertrude. '''G'''.
:Hairy: As in "'''G'''round!"
:Jill: And "di'''G''' a hole!"
:Ponytail: I'll get a shovel!
:Cueball: To the yard!

:[Caption below the panel:]
:Some of the authors of books I read as a kid were '''''terrible''''' at designing puzzles.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Jill]]
[[Category:Comics featuring Ponytail]]
[[Category:Cryptography]]
[[Category:Kids]]

2869: Puzzles

2023-12-18T20:55:47Z

Mat0329Lo:

2856: Materials Scientists

2023-11-19T17:11:54Z

Mat0329Lo: /* Explanation */ Using the usual capitalization for these words.

{{comic
| number = 2856
| date = November 17, 2023
| title = Materials Scientists
| image = materials_scientists_2x.png
| imagesize = 296x445px
| noexpand = true
| titletext = If a materials scientist gives you a present, always ask whether regifting will incur any requirements for Federal paperwork.
}}

==Explanation==
{{incomplete|Created by a BIOLUMINESCENT DEPLETED URANIUM WRAPPING PAPER GIVING OFF A BIT TOO MUCH CHERENKOV RADIATION- Please change this comment when editing this page. Do NOT delete this tag too soon.}}

{{w|Material science}} is essentially the study of materials, like {{w|steel}}, including some pretty strange ones such as {{w|Vantablack}} and {{w|triiodide}}. Here Ponytail and White Hat have given Cueball (a material scientist) some sort of present. Cueball is amazed with the wrapping paper and tape itself, trying to make out what they are all made of. The caption reveals that the cardboard box is empty and the wrapping paper ''is'' the present; as a material scientist, Cueball is more enamored by the (strange and exotic) wrapping paper, far more than he would be by any actual present inside.

The punchline also compares Cueball to a cat. A common stereotype ([https://www.reddit.com/r/funny/comments/8zw63a/thanks_for_box_human_oh_and_the_cat_tree_it_came/ with lots of image proof, to boot]) about domestic housecats is how they enjoy playing with empty boxes and discarded wrapping paper much more than the cat toys contained therein.

{{w|Aramid}} fibers (misspelled as "amarid" in the comic) are a class of strong synthetic fibers, built from aromatic rings connected via amide linkages. {{w|Kevlar}}, a material commonly and perhaps most famously used as a [https://youtu.be/gPKbOrxgx-w bullet-resistant fabric for] {{w|Bulletproof vest#Soft armor|soft bulletproof vests}}, is an example of an aramid. Due to their strength, they can be quite durable, even when thin, as depicted in the comic.

{{w|Triboluminescence}} refers to a phenomenon where mechanically working on a material (in this case pulling on the tape) causes it to glow. Triboluminescence is still not well understood by material scientists, so they may find such materials particularly appealing. One famous example comes from crushing Wint-O-Green Lifesavers mints, which creates [https://interestingengineering.com/video/life-saver-candy-lights-up-like-lightning-when-smashed particularly bright blue sparks] compared to other hard candies. Staying in the realm of wrapping, Scotch tape exhibits this property too, [https://www.technologyreview.com/2008/10/23/217918/x-rays-made-with-scotch-tape/ to a point where it can even be used as an x-ray]. Phosphors are substances that glow when exposed to some other, typically more energetic, form of radiation, and can be used to produce a desired glowing effect by taking less useful parts of the spectrum (e.g. beyond the visible, or in an unnecessary area of the visible one) and shifting that into more practical hues.

{{w|Structural coloration}} is a phenomenon where the coloration of an animal or plant is not produced via pigments but via structural interactions with visible light at the scale of a wavelength (e.g. diffraction gratings, thin-film interference). More generally, it can also be used to refer to artificial materials that have a similar effect.

This comic may also be an example of [[Nerd Sniping|nerd sniping]], specifically to the materials scientist.

The title text states that if a materials scientist gives you a gift, you should ask if regifting it requires any form of federal paperwork. This is because the materials scientist may have access to items which are dangerous and strictly regulated, such as {{w|polonium}} (an extremely radioactive element), {{w|fluoroantimonic acid}} (the strongest acid discovered), {{w|nitrogen triiodide}} (one of the most sensitive explosives in the world), and {{w|n-butyllithium}} (an extremely flammable, pyrophoric, and caustic compound).

==Transcript==
:[Ponytail, White Hat and Cueball are standing around a table. On the table is a gift with thin black stripes, with a present with a black ribbon sitting on top of it. Cueball is trying to holding a gift that has thick black stripes, trying to open it.]
:Cueball: Where is this wrapping paper from? It's so thin, but I can't tear it. Is this amarid fabric?!
:Cueball: Maybe I can unpeel the... oooh, the tape flashes as I pull it up! Triboluminescence! Did you add a phosphor? It's so bright!
:Cueball: Wait, are these patterns structural coloration?

:[Caption below the panel:]
:Materials scientists are like cats - the best present you can get them is an empty box with cool wrapping paper.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring White Hat]]
[[Category:Science]]

2799: Frankenstein Claim Permutations

2023-07-08T16:30:10Z

Mat0329Lo: /* Transcript */ Adding a description of the graphic next to the claims.

{{comic
| number = 2799
| date = July 7, 2023
| title = Frankenstein Claim Permutations
| image = frankenstein_claim_permutations_2x.png
| imagesize = 596x612px
| noexpand = true
| titletext = When I began trying to form a new claim by stitching together these parts in such an unnatural way, some called me mad.
}}

==Explanation==
{{incomplete|Created by LORD BYRON THROWS THE WEIRDEST PARTIES - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

{{w|Frankenstein}} is an 1818 novel by Mary Shelley about a young scientist named Victor Frankenstein who creates a sapient, humanoid lifeform through an unorthodox experiment, and then rejects his creation, which eventually turns on him. The novel is a classic in both the horror and speculative fiction genres, and has been argued to represent the first major example of true science fiction in literature. The lifeform he creates is never named in the original novel, only being referred to as "the Creature".

In the two centuries since the novel's publication, the story and its characters have been adapted and reused in various forms, and the term "Frankenstein" has come to be commonly used to refer to the the creature, rather than the scientist who created him. Literary didacts are often quick to point out this error, but are generally ignored, as the name has become accepted, common usage. The debate has become something of a meme. (Some argue that, given that the creature refers to himself as effectively being Frankenstein's son, it makes sense that he would share the last name.) These disputes have previously been touched upon in [[1589]] and [[2604]].

The title text points out that he's "stitching together" various claims to create something new, and people consider him mad as a result. This refers to the notion of Frankenstein's creation having been stitched together from dead bodies, and Dr. Frankenstein himself being denounced as a madman. It should be noted that these perceptions come from later adaptations (most notably {{w|Frankenstein_(1931_film)|the 1931 film}}) rather than the original novel, but have become closely associated with the Frankenstein mythos.

This comic explores the possible [[wikipedia:Permutation|permutations]] that can be made by matching the names of Mary Shelly, Frankenstein, and '?' (for the unnamed monster) to the positions of author, creator, and monster. The positions are indicated in the drawing by a circle to the left of the book for the author, a box on the left-hand page for the creator, and a labeled picture of the monster lying under a sheet (the traditional image of the monster before being animated) for the monster. Three elements can be arranged in six different ways, as the first element can be placed in any of the three positions, the second in either of the two remaining, and the last in the only remaining space, giving 3 x 2 x 1 options. The same concept was used in [[1613]], where Randall depicted six possible permutations of the Three Laws of Robotics.

{| class="wikitable"
|- style = "text-align: center;"
!Claim!!Notes!!Permutation!!Explanation
|-
|"No, the monster in Mary Shelley's book is unnamed. Frankenstein is the doctor who created him."||This is the normal claim||MS-F-?||This is the claim that is generally considered correct. The POV character of the novel is, in fact, Victor Frankenstein. The monster is never given a name, although many fans name him Adam because of a line he speaks to Victor: "'I ought to be thy Adam, but I am rather the fallen angel, whom thou drivest from joy". The only error in this claim is referring to Victor as a doctor. (At the time the novel was written, medical degrees and other doctorates were quite rare)
|-
|"No, the monster in Mary Shelley's novel is named Frankenstein."||Also common, and not worth getting mad about IMO||MS-?-F||This is a common misconception, but Randall believes it's not something to get upset about. Randall has previously touched upon this in [[1589]] and [[2604]]. This permutation places the '?' in the creator position, and so avoids talking about the doctor's name at all.
|-
|"No, Frankenstein is the name of the author. The monster Mary Shelley created is unnamed."||At a glance this could pass for one of the normal claims||F-MS-?||While slightly stretching the meaning of those words, Mary Shelley did "create" the monster (as it's a character in the book she wrote) and Frankenstein is the "author" (creator) of the monster. Alternately, one can consider the story a mostly first hand account of Victor's exploits, as it is initially told to the book's opening narrator (the otherwise sidelined Captain Robert Walton), with Mary having created Monster, Victor, the Captain and all others within the novel (of the Captain's tale of Victor's tale of the apparent nature of the Monster).
This could also be a reference to a tweet[https://twitter.com/MedCrisis/status/1511644464544104452] featuring a photo of a collection of classic books[https://i.redd.it/bnab4cu39dqa1.jpg] in which "Frankenstein" is printed in the position and format of the author's name for the other books of the collection, while "Mary Shelley" is printed in the title position.
|-
|"No one knows who wrote the novel about Doctor Mary Shelley creating the monster Frankenstein."||I would read this book||?-MS-F|| This statement combines the second claim (that Frankenstein is the monster's name) with the third claim (that Mary Shelly created the monster). This time, however, it is claimed that the ''author'' is unknown, while the monster is named. Once again, this claim is almost reasonable, as it could be argued that Mary Shelly, as the author, did create Frankenstein (although she was also not a doctor).
A novel about author Mary Shelly getting a doctorate and actually creating the creature she wrote about could be an interesting twist on the story, hence Randall's comment that he would read this book.
|-
|"No, Frankenstein is the name of the doctor. The monster he created is Mary Shelley."||rowspan=2|Fully chaotic||?-F-MS|| This claim is similar to the others, in that it twists the ordering of the components (author, doctor, monster), but this time it gets the doctor's name correct whilst insinuating that Mary Shelly was the monster he created. This is described as "fully chaotic", likely because the idea of the real-life human author being created by a doctor in the story that was written by her is much less believable and much further from any solid literary footing than the others.
|-
|"No, the doctor who creates Mary Shelley in Frankenstein's novel doesn't have a name."||F-?-MS||Possible Doctor Who reference.
|}

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
{| class="wikitable"
|- style = "text-align: center;"
|Claim||Notes
|-
|"No, the monster in Mary Shelley's book is unnamed. Frankenstein is the doctor who created him."||This is the normal claim
|-
|"No, the monster in Mary Shelley's novel is named Frankenstein."||Also common, and not worth getting mad about IMO
|-
|"No, Frankenstein is the name of the author. The monster Mary Shelley created is unnamed."||At a glance this could pass for one of the normal claims
|-
|"No one knows who wrote the novel about Doctor Mary Shelley creating the monster Frankenstein."||I would read this book
|-
|"No, Frankenstein is the name of the doctor. The monster he created is Mary Shelley."||rowspan=2|Fully chaotic
|-
|"No, the doctor who creates Mary Shelley in Frankenstein's novel doesn't have a name."
|}
[On the left of each of the claims is a book, containing a rectangle containing a symbol representing the creator of the monster on the left page, and a picture of the monster in the book ''Frankenstein'' above another symbol representing the name of the monster on the right page, and a circle containing a symbol representing the author of the book outside of the book with an arrow pointing to the book. "MS" represents Mary Shelley, "F" represents Frankenstein, and "?" represents an unknown entity.]
[[Category:Frankenstein]]
{{comic discussion}}

1282: Monty Hall

2023-05-29T18:10:48Z

Mat0329Lo: /* The Monty Hall Problem */

{{comic
| number = 1282
| date = October 25, 2013
| title = Monty Hall
| image = monty hall.png
| titletext = A few minutes later, the goat from behind door C drives away in the car.
}}

==Explanation==
This comic is a reference to the US game show ''{{w|Let's Make a Deal}}'', and more specifically the {{w|Monty Hall problem}}, a probability puzzle based on the show and named after its original host, {{w|Monty Hall}}. The premise of the show was that Hall would offer "deals" to contestants pulled from the audience in which they could win cash and prizes. Some deals involved games/tasks the contestant had to perform, while others simply involved the contestant making choices between a series of doors or boxes. In such games of choice, there were often several prizes and typically at least one "zonk", the show's name for an undesirable "gag" prize, which on the original Monty Hall version of the show were frequently animals such as goats.

In the {{tvtropes|MontyHallProblem|classic version of the Monty Hall Problem}}, a contestant is offered a choice of three doors. Behind two of the doors are goats, and behind one of them is a car. First, the contestant chooses a door, which remains closed. The host then opens one of the two remaining doors and reveals a goat. The contestant is then offered a final choice of whether to switch their choice to the remaining closed door, or keep the door they originally chose. The problem involves an analysis of the probability of the contestant choosing the car given certain circumstances.

The problem assumes that a contestant would want to win a car, and would be disappointed to win a goat, which most contestants would have no ability to house, and no use for. The comic shows that [[Beret Guy]], upon the host revealing that door B has a goat behind it, chooses to take the goat to keep as a pet, which makes them both very happy. This is much like, and may be an allusion to, the Simpsons episode {{w|Bart Gets an Elephant}}, in which Bart opts for the gag prize of an African Elephant rather than the $10,000 award. According to an [http://www.tvparty.com/gamemonty2.html interview] with Monty Hall, several contestants actually decided to keep the animals; although rare, it was allowed since the animals were offered as prizes (and they were a lot more expensive than the consolation cash prize).

The title text references the car and the other goat, untouched behind the remaining doors.

===The Monty Hall Problem===
:''For an in-depth analysis of the Monty Hall Problem, see {{w|Monty Hall Problem|its article at Wikipedia}}''
The apparent "paradox" of the Monty Hall Problem is that many people's initial reaction once the host opens a door to reveal a goat, is that there are two remaining doors, one with a car and one with a goat; and therefore there is an equal probability the car is behind each door. Many people therefore believe that switching makes no difference to the odds of winning a car.

[[File:montyforexplainxkcd.png]]


However, assuming that the host has knowledge of which doors contain goats, and that their choice of which door to open is always an unchosen door containing a goat, it is actually twice as likely that the contestant will win the car if they switch than if they keep their original choice. This is because the contestant initially had a one-in-three chance of choosing the car and a two-in-three chance of choosing a goat. Switching always wins the car in those two-thirds of cases where the contestant initially chose a goat. The probability of winning by switching is therefore the same as the probability that the contestant initially chose a goat.

The switch essentially gives the contestant ''both'' remaining doors instead of just the ''one'' door originally chosen. Because the host ''always'' has at least one goat available, the fact that the host reveals a goat does not provide the contestant any new information about their initially chosen door. The initial door still has a two-in-three chance of being a goat, and switching still has a two-in-three chance of winning. Opening a goat-door simply shifts all of the probability of the remaining two doors being a car to the remaining unchosen door.

'''Simple explanation''':
Imagine there are 100 doors instead of just 2, and after you pick a door, the host opens all but one, revealing all goats. Do you switch to the remaining door or keep your initial pick? Just as there is a 2/3 chance of picking the car when switching in the 3-door scenario, there is now a 99/100 chance of picking the car when switching in the 100 door scenario. In this scenario, it becomes obvious that it is not a 50/50 chance when two doors remain.

'''Important Side Note''':
There has been great debate about the precise wording of the problem, and what assumptions or rules might apply. These variants can greatly change the probabilities.

One variant has the host open one of the two remaining doors at random, which could result in the car being revealed, and the game ending. In that scenario, if a goat has been revealed, the probability that the first pick is correct is now 1/2 and switching is not advantageous.

:*In 1/3 of all possible games, the first pick is correct. The host cannot pick the car.
:*In 1/3 of all possible games, the first pick is wrong but the host does not reveal the car.
:*In 1/3 of all possible games, the first pick is wrong and host will reveal the car. We now know those cases are impossible.

With only 2/3rds of all possible games remaining, the chance that switching will win the car is now (1/3)/(2/3) = 1/2. Likewise, not switching also has a 1/2 chance of winning. '''Note that this variant requires that the host picks a door at random.'''

Another variant has the host only offering to switch if the first choice is correct. In this case, switching always loses.

==Transcript==
:[A figure - Monty Hall - stands on stage, holding a microphone. There are three doors; two labelled "A" and "C", which are closed, and one that is being held open by Monty. There's a ramp to the right, down which a goat is being led by Beret Guy.]
:Beret Guy: ...and my yard has so much grass, and I'll teach you tricks, and...
:Goat: ♥

==Trivia==
*The Monty Hall problem is strikingly similar to the {{w|Two envelope problem|Two Envelope Paradox}}, one of [http://blog.xkcd.com/2008/09/09/the-goddamn-airplane-on-the-goddamn-treadmill/ several notoriously provocative thought experiments] (some of which are "banned" on the xkcd forums). Admittedly, the Monty Hall problem has only one clear solution. Because of this, it is much less likely to spark the kinds of arguments like "the goddamn airplane on the goddamn treadmill" or the "{{w|Feynman sprinkler}}" incite.

{{comic discussion}}
[[Category:Comics featuring Beret Guy]]

2735: Coordinate Plane Closure

2023-02-11T01:35:13Z

Mat0329Lo: /* Transcript */ Replate "!" with "⚠"

{{comic
| number = 2735
| date = February 8, 2023
| title = Coordinate Plane Closure
| image = coordinate_plane_closure_2x.png
| imagesize = 271x376px
| noexpand = true
| titletext = 3D graphs that don't contact the plane in the closure area may proceed as scheduled, but be alert for possible collisions with 2D graph lines that reach the hole and unexpectedly enter 3D space.
}}

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

This comic is a "Math Notice," which is presumably a warning or reminder for mathematicians or others who interact with the field of mathematics, in a similar way to how a "Travel Notice" may prewarn drivers of planned road closures for repairs (or [https://www.cameroncountytx.gov/spacex/ rocketry]). It also has similarities to that of a {{w|Notice to mariners}} or {{w|NOTAM|air missions}}, where nautical or aeronautical navigation might be impinged by a clear area (or volume) that should be kept clear from in the near future, and to notices from websites or software providers about planned maintenance, which alert users about upcoming outages. Specifically, this notice advises those who are using the coordinate plane to avoid drawing any graphs in the area with a hole until the damage is patched or fixed.

The joke may have been inspired as a response to the {{w|2023 China balloon incident}}, which occurred a few days earlier. This had occasioned one of the largest temporary flight restrictions, with a closed airspace as a response, in U.S. history.

{{w|Coordinate planes}} are used in math for drawing graphs. The joke here is that a small section has been "closed for maintenance," likening the concept of a coordinate plane to an actual physical platform used by math, which is therefore vulnerable to damage such as is shown in the comic. In reality, the coordinate plane cannot be damaged as it is not a tangible thing.{{citation needed}}

Closure in mathematics can be a term relating to sets, specifically operations on sets, and a coordinate plane is a particular set of numbers. A set is closed under an operation if all the "answers" to the operation are also in the set. The coordinate plane is said to be closed under vector addition for example - adding together any two coordinates produces another coordinate in the plane. Many functions and operators may be said to have closure on the real plane, and this comic may be a pun on that term. However, if there actually is a hole in the plane, then suddenly the plane will no longer exhibit closure.

Also related to closure is the {{w|closure problem}}. Put simply, the closure problem is to find the highest or lowest weight of a closure in certain types of graphs. This comic may also be talking about the closure problem, as it talks about a hole in the graph, and to minimise it would be referring to the closure problem.

Closure can also be used in another sense, relating to the topology of a set; roughly speaking, a description of what parts of the set are "close" to others. In this sense, if one takes the closure of a plane with a hole, the result is indeed an intact plane, provided the hole is sufficiently (infinitesimally) small.

The title text notes that 3D graphs that cross the relevant x and y coordinates, but with non-zero z coordinates whilst in that zone, should be fine, since the hole only exists in the plane where z = 0. However, if they pass close - i.e. the z coordinate is small in this region - they should be wary of two dimensional graph lines suddenly become three-dimensional and interfering with them. This could be because they have intentionally entered three-dimensional space to avoid the closure, or possibly they have inadvertently been 'launched' above/below the plane by the torn and warped edges of the surface. This is similar to warnings to road traffic in open lanes being warned of traffic merging from lanes that have been closed due to works or any other general warning of increased congestion upon a parallel route used as a diversion.

The concept of 2D objects suddenly entering 3D space — in a way that creates interesting drama and conflict — is the subject of a book, Flatland, that Randall is familiar with, as it was the subject of [[721: Flatland]].

==Transcript==
:[A coordinate graph is shown with both axes unlabeled but with two labeled ticks. In the middle of the shown area of the graph there is a hole torn in the white "fabric" of the graph's plane. It has jagged edges and lines runs away from the hole in all directions. The area visible through the hole is covered in thin gray lines, and the edges of the hole cast shadows onto the surface below. Two points are marked on the graph at coordinates (X,Y) of (1.5, 1) and (2, 1.5). These two dots marks two of the corners of a square drawn with gray dotted lines, The square completely surrounds the hole. Above the graph there is a very large heading, with black danger triangles with exclamation marks in them, on either side of the heading. Below this there are three lines of text. And below the graph there are four more lines of text.]
:<big>⚠ Math Notice ⚠</big>
:The coordinate plane will be closed Thursday between (1.5, 1) and (2, 1.5) to repair a hole.
:Labels on Y-axis ticks: 1 2
:Labels on X-axis ticks: 1 2
:If your graph uses this area, please postpone drawing until Friday or transform it to different coordinates.

{{comic discussion}}

[[Category:Charts]]
[[Category:Math]]

1729: Migrating Geese

2022-10-08T23:19:03Z

Mat0329Lo: /* Table of labels */ THE QUEEN IS DEAD. LONG LIVE THE KING.

{{comic
| number = 1729
| date = September 5, 2016
| title = Migrating Geese
| image = migrating_geese.png
| titletext = "Hey guys! I have a great idea for a migration!" "Dammit, Kevin."
}}

==Explanation==
{{w|Bird migration|Migrating}} refers to the changing of a habitat, which happens every year with birds like {{w|geese}} that travel long distances to avoid cold seasons and get back to the food in the summer time. When geese fly to their new habitat, they tend to fly in a very clear {{w|V formation}}. The V formation improves the efficiency of flying birds, particularly over long migratory routes. All the birds except the first fly in the upwash from one of the wingtip vortices of the bird ahead. The upwash assists each bird except for the "leading" one in supporting its own weight in flight, saving them up to 20% of the energy needed.

It should be noted that geese do have family structures with adult geese in "alpha" positions, but not a strict ranking order. An individual's position in formation flights is coincidental and constantly changing, so that the goose at the point of the formation can pull back and rest in the V wings while others "lead" the swarm. Popular earlier beliefs about an "alpha goose" heading a formation for the entire flight is a myth, easily disproved by watching geese formations in flight.

This comic shows such a formation with 20 geese, with several geese and areas in the V formation labeled, giving different roles to the geese and assigning these areas a new meaning. See the [[#Table of labels|table below]].

Apart from a "twin engine" goose in the bottom right arm of the V the only part of the formation that would not normally be seen is Kevin, who flies off at a 45-degree angle. In that direction there is no aerodynamic help from the other birds, and in the title text the rest of the geese also exclaim, "Dammit, Kevin" when he (again?) tells them that he has a great new idea for a migration (maybe referring to the new direction). This is either a reference to the fact that migrating birds manage to consistently arrive in the same general area every year, or to the way that vacations are sometimes suggested (by humans): "I thought of an idea for a vacation..." This was only the second time the name Kevin was used in xkcd for a fictive person, see more in [[1795:_All_You_Can_Eat#Kevin|this trivia]].

===Table of labels===
{| class="wikitable"
!Name
!Explanation
|-
|Head Goose
(4th in line to the British throne)
|Supposedly, this goose is in line to become the newest monarch of the United Kingdom after the deaths of the three (humans) who were ahead of it at the time of the comic’s publication ({{w|Charles III|Charles, Prince of Wales}}; {{w|William, Prince of Wales|William, Duke of Cambridge}}; {{w|Prince George of Wales|Prince George of Cambridge}}[https://en.wikipedia.org/wiki/Succession_to_the_British_throne]). In actuality the fourth in line to the British throne was then {{w|Princess Charlotte of Wales|Princess Charlotte of Cambridge}} (now {{w|Prince Louis of Wales}} by the death of {{w|Elizabeth II|the Queen}}. In North America, the best-known goose migration is that of {{w|Canada goose|Canada geese}} to the US east coast. Canada used to be part of the {{w|British Empire}} and remains a member of the {{w|Commonwealth of Nations}}, so a "Canadian" goose would be well situated to stand within the succession (excepting, of course, for the fact that it's a goose). As the main rules of {{w|succession to the British throne}} long. [http://www.wargs.com/essays/succession/2011.html Very long.] The head goose being fourth in line may be mocking the second row of an American football formation, just like the associated goose. On nearly every non-kicking play, the quarterback is the player who stands behind the center and receives the ball to start the play. In modern American football, the quarterback is usually considered the leader of the team, and is often responsible for calling the play.
|-
|Comptroller
|A {{w|comptroller}} is a position in many corporations and some governments. An officer of this title is responsible for the oversight of financial operations and ensuring that accounting is conducted accurately.
|-
|Migration abort goose
|This might be a reference to launch af bort capsules used in rockets to safely land astronauts in the case of a critical stage failure. Or it could be operated like an abort button aborting the entire migration for all geese.
|-
|Twin-Engine Model
|This goose has two tails offset on each side of the center of the goose, instead of one tail in the middle like the rest. The "tails" also extend beyond the wings, which makes it look like a Twin-Engine aircraft, which has two motors: one on each wing instead of one in the nose. Later Randall made no less than eight plane/birds combination like this in [[1824: Identification Chart]].
|-
|CIA Informant
|A person, usually a criminal, that surreptitiously provides information to the {{w|Central Intelligence Agency}} (CIA), a foreign intelligence agency of the United States federal government. If these geese are from Canada, the CIA might have inserted an informant to be kept up to date on their activities. However, it is unlikely that the CIA would have great interest in the migratory patterns of geese.{{Citation needed}}
|-
|Backups
|These are geese that are not used in the formation so they can replace other geese in their positions in case they have problems performing their task. This may also be a pun/joke about technology/data "migrations" where backups should be taken liberally due to risk of data loss.
|-
|Shock Front
| A shock front is the front boundary of a {{w|shock wave}} created by either a {{w|sonic boom}} or another explosion in a fluid/gas. It can also refer to the shock wave itself. A V-shaped shock-wave called a '{{w|Bow shock (aerodynamics)|bow shock}}', similar in appearance to the V-shaped goose formation, is generated by a supersonic object. Since geese fly subsonically in normal circumstances {{Citation needed}}, they do not generate a shock wave. But of course, this set of geese may be somewhat different considering the involvement of CIA and stealth technology.
|-
|Missing Valence Geese
|In Chemistry, {{w|Valence (chemistry)|valence}} electrons are the electrons in the outermost "layer" which change places when chemical reactions happen. As there is an optimal number of electrons in a layer, if there are missing valence electrons, atoms which can fill in these gaps tend to react with the atoms having the missing electrons. In case of "electron sharing" (aka covalent bond) molecules result from such an encounter. The comic suggests a second geese formation that has proper "valence geese" in the appropriate position could bond (=merge) with this one into a larger formation. A normal geese V formation like the one in the comic has one side longer than the other and this is possibly Randall's explanation for the phenomenon.
In reality, geese do form V-shaped flocks, since the rear geese can profit aerodynamically from the vortices created by the front geese, and that way the overall flock requires less energy. So there is actually some evolutionary sense for additional geese to fill the "valence holes". It is thus a little weird that there are two backup geese close to these valence vacancies, as they should then have filled them up...
|-
|Stealth cargo being escorted
|The formation is forming a protective surrounding around an empty space in the middle which in a military formation could contain protected cargo. As there is no cargo visible in the geese formation, it is titled "{{w|Stealth technology|stealth}}". This would be a nice [[:Category:Conspiracy theory|conspiracy theory]] to spread.
|-
|Kevin
|Also mentioned in the title text. It is unclear what the name refers to. It may refer to:
* The "go-to name" for [[Randall]] at the time of this comic's release, as he also used the name in [[1719: Superzoom]], ten comics before this one; as well as What-If #83 as a placeholder name for the comet 67P/Churyumov–Gerasimenko. This was thus the only second time the name Kevin was used in xkcd for a fictitious person, see more in [[1795:_All_You_Can_Eat#Kevin|this trivia]]. Here is also mentioned the only four real Kevins that has been mentioned by name in xkcd. (None of those are mentioned here below).
* An {{w|Eddie Izzard}} skit about migrating birds (Eddie Izzard - Religions, Cats & Migrating Birds). A group of birds are following Kevin, assuming that he knows where he is going, but he gets lost and they end up in the wrong place.
* Kevin McCallister from the {{w|Home Alone}} movies, who gets separated from his parents a lot. (see [[1164: Home Alone]]).
* [https://www.reddit.com/r/AskReddit/comments/219w2o/whos_the_dumbest_person_youve_ever_met/cgbhkwp Kevin of reddit fame], the dumbest person ever.
* One of the {{w|Minions (Despicable Me)|Minions}} from the "{{w|Despicable Me}}" franchise ([http://despicableme.wikia.com/wiki/Kevin Kevin]), who leaves the main Minion group in search of a new master.
* The intelligent and playful bird [http://disney.wikia.com/wiki/Kevin Kevin], from the Disney/Pixar movie {{w|Up (movie)|Up}}.
* [https://youtu.be/OyqdoxTEmdg Kevin] from {{w|South Park}}. Especially the "Dammit Kevin" mentioned in the title text could arise from this.
* [http://the321penguins.wikia.com/wiki/Kevin Kevin] from [https://en.wikipedia.org/wiki/3-2-1_Penguins! 3-2-1 Penguins!], who "will answer questions and save planets without even knowing he could."
* {{w|We Need to Talk About Kevin}}, a book and drama film about a deranged child.
* Kevin Beckman, the dimwitted receptionist from the 2016 [https://en.wikipedia.org/wiki/Ghostbusters:_Answer_the_Call Ghostbusters] movie.
* The internet meme (especially in Europe) according to which being named Kevin connotates being the village idiot. Kevin is usually urged to stop talking, ironically congratulated, etc. It’s due to the fact that this name was given [https://www.quora.com/Why-does-the-name-Kevin-have-so-many-negative-connotations-in-modern-Germany-Is-it-really-because-of-Kevin-Costner mainly in low socioeconomic class] (so Kevins will probably have poor education) and possibly because it was [https://translate.google.fr/translate?sl=fr&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fprenoms.doctissimo.fr%2Ftop-prenoms-annee-1991.html&edit-text=&act=url way too common around the ’90s].
* The '''''idiot.'''''
|}

==Transcript==
:[Caption above the panel:]
:Understanding Migration of Geese

:[20 geese are shown flying in a typical migratory V-formation. As they are shown in silhouette it is not possible to determine if they are seen from above or from below. They are flying toward the top of the image with the first goose close to the top in the middle of the image. There is one head goose, and then there are 7 geese in the left arms and 9 geese in the right arm. Behind the left arm there are two stragglers that are not in line with the others, but closer to the middle than those above and not as close to each other as the rest but still flying in the same direction. Finally there is one goose at the bottom right corner flying at a 45 degree angle away from the other to the right. The first goose is flapping its wing, which is also the case with six other geese, no. 4 and 6 in the left and 3, 5 and 6 in the right arm as well as the middle of the two in the rear towards the middle. The rest are soaring with straight wings and all of these look the same except no. 7 in the right arm which has two tails, which both goes ahead of the wings, making it look like a plane with two engines. The head goose and 5 of the 9 geese in the right arm as well as the one bottom right are labelled with and arrow pointing to them from the label. The front goose has the label in front to the left, the other have it in front to the right, except the second last in the arm which has the label inside the V and one flying away which has the label right above it. The two behind and right of the left arm have one label behind them with two arrows from the label pointing at both geese. There is a thick curvy line in front of geese no. 3 to 5 in the left arm. In front of that line is a thinner broken line. In front of this is a label written with the same curvature. There are two areas surrounded by dotted lines. The first one is behind the last of the left arms geese, extending in the same direction for a distance of about two geese. It has a label above and left with and arrow pointing to it. The other area is in the middle of the V forming a loose triangular structure with a label inside.]
:Head goose: Head goose (4th in line to the British throne)
:Right no. 1: Quarterback
:Right no. 3: Comptroller
:Right no. 5: Migration abort goose
:Right no. 7: Twin-engine model
:Right no. 8: CIA informant
:Bottom right corner: Kevin
:Behind center: Backups
:In front of left no. 3-5: Shock front
:Empty area behind left arm: Missing valence geese
:Empty area in center: Stealth cargo being escorted

{{comic discussion}}

[[Category:Animals]]
[[Category:American football]]
[[Category:Aviation]]

2678: Wing Lift

2022-09-30T14:13:02Z

Mat0329Lo: Changed citation needed formatting.

{{comic
| number = 2678
| date = September 28, 2022
| title = Wing Lift
| image = wing_lift_2x.png
| imagesize = 679x358px
| noexpand = true
| titletext = Once the air from the top passes below the plane of the wing and catches sight of the spooky skulls, it panics, which is the cause of turbulent vortices.
}}

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

This comic is a parody of the incomplete explanations given to physics students on how wings produce lift.

Specifically, it parodies the Equal Transit Time fallacy, which states that the air flowing above the wing and the air flowing below the wing have to travel from one side of the wing to the other in equal time, so the air above the wing has to travel faster to keep up with the air below. This assumes that the air above the wing is somehow conscious of what the air below the wing is doing. 

This assumption of consciousness is taken to extreme parody by the comic - it implies that the bottom air can be frightened by skulls, that the top air is curious to see what's going on, and that air can panic. In real life, this is not the case.{{Citation needed}}

Wings can produce {{w|Lift (force)|lift}},<ref name="Prandtl & Tietjens (1952)">Tietjens, Oskar Karl Gustav; [https://en.wikipedia.org/wiki/Ludwig_Prandtl Prandtl, Ludwig] (1957). [https://books.google.com/books?id=4KtFcuCZ3VsC&pg=PR1 ''Fundamentals of Hydro- and Aeromechanics'']. Courier Corporation. ISBN 978-0-486-60374-2</ref> i.e. an upwards force with which an aircraft is held in the air.

One or more of three main reasons may typically be given as to why airplane wings produce lift:
* {{w|Bernoulli's principle}} (Perhaps the most frequently cited/demonstrated as a basic introduction to wing-physics.)
* {{w|Angle of attack}} (The airplane wing angles up so that air is deflected downwards, by the {{w|Newton's sine-square law of air resistance|'ski effect'}}.)
* {{w|Coandă effect}} (The top is curved, so air going over the wing must curve downwards in order to avoid creating a vacuum above the back of the wing, and by Newton's third law, this results in an upwards force on the wing.)
The comic references all three of these reasons. Airflow splitting references Bernoulli's principle, while the air at the bottom being scared and fleeing downwards is similar to the effect of air hitting the angled bottom of the wing. The air going over the top curving down references the Coandă effect, although the comic claims that this effect is instead caused by the top-air noticing the bottom-air fleeing downward and goes down to investigate why the bottom-air is fleeing. The mention of Newton's third law is indeed correct, even if the movement of the air is for the wrong reasons. In the title text, it additionally suggests that the top-flow also end up glimpsing the printed skulls, causing it to also chaotically flee, generating a wing's classic turbulent wake.

Randall previously dealt with explanations of wing lift in [[803: Airfoil]].

==Transcript==
:[Caption at the top of the panel above the drawing:]
:How a wing produces lift

:[The drawing is a diagram of the cross-section of a plane wing. It is large and rounded on the left end and flat on the bottom while the top curves down to meet it at a sharp point to the right. There are many small arrows indicating the flow of wind, in front of, above and below and behind the wing. Four sections of the wind has captions.

:[The arrows come from the left of the panel, point towards the wing, and then half begin to go over and half begin to go under. There is a caption in the middle of this flow:]
:Airflow splits around the top and bottom of the wing

:[The arrow flowing above continue to the back without caption. But the arrows going under the wing goes by a circle underneath the wing. The circle is connected to an arrow which points to the underside of the wing indicating that the content of the circle represents the underside of the wing. The circle shows a repeating pattern of small black (simplified) skulls, that not only fills the circle but can be seen on the arrow pointing to the underside of the wing. There is a caption to the right of this:]
:Spooky skulls microprinted on the bottom of the wing frighten the air, which flees away downward

:[The arrows going above the wing begins to curve downward at the end of the wing. In the middle of these arrows is a caption:]
:Top air goes to see what's wrong

:[After the spooky skulls the the arrows under the wings also begins to curve downwards and both streams of arrows from above and below have joined at the end of the wing and are all pointing to the bottom right of the panel. In front of them is a caption:]
:By Newton's third law, downward deflection of air pushes wing upward

{{comic discussion}}

[[category:Engineering]]
[[category:Physics]]
[[category:Aviation]]

243: Appropriate Term

2022-06-09T02:57:09Z

Mat0329Lo: /* Transcript */

{{comic
| number = 243
| date = April 2, 2007
| title = Appropriate Term
| image = appropriate term.png
| titletext = I know a lot of people hate these, but I prefer them to touchpads.
}}

==Explanation==
This is a simple comic offering increasingly {{w|NSFW|not-safe-for-work}} names for a laptop's {{w|pointing device}}. {{w|Pointing stick|This stick}} was an alternative to a mouse, but has largely been supplanted by the touchpad.

"TrackPoint" is the trademarked term used by IBM (and later Lenovo) for the pointing stick implemented on ThinkPad laptops. They are usually colored red, as in the comic. Other manufacturers have alternative names for their implementations, and typically use diferent colors. It is obviously the most formal of the four names. The more informal two are nub and nipple mouse (referencing breasts), with the last, most informal being clit mouse, a reference to clitoris (part of the female genitalia).

The title text notes that [[Randall]] prefers pointing sticks to touchpads.

==Transcript==
:[A diagram of a TrackPoint pointer on a keyboard, under which is a continuous line labeled "Tone of Conversation-Formal to Informal." There are four boxes under this line.]
:How to refer to the pointer thing on laptop keyboards:
:Very formal: TrackPoint™-style pointer
:Formal: Nub
:Informal: Nipple mouse
:Very informal: Clit mouse

{{comic discussion}}
[[Category:Charts]]
[[Category:Comics with color]]
[[Category:Computers]]
[[Category:Sex]]