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<center>
[http://www.explainxkcd.com/wiki/index.php?title=explain_xkcd:Sandbox&action=edit&oldid=91667 clear sandbox]
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<font size=5px>''Welcome to the '''explain [[xkcd]]''' wiki!''</font><br>
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<span style="font size:210%;">We have an explanation for all [[List of all comics (full)|'''{{#expr:{{PAGESINCAT:All comics|R}}}}''' xkcd comics]], and only {{PAGESINCAT:Incomplete explanations|R}} ({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 1}}%) are incomplete. [[:Category:Incomplete explanations|Help us finish them!]]</span><!-- Note: the -1 in the calculation above has been removed (it was there to discount "comic" 404, but we've categorized it to be a comic and so has Randall.) -->
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<!-- Go to this explanation button --><span style="position: absolute; right:0; padding-top:1.4em; font-size: 100%;"><span class="no-link-underline">[[{{LATESTCOMIC}}|&nbsp;</span>'''Go to this explanation''']]</span>
  
{{comic
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=Latest comic=
| number    =
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<div style="border:1px solid grey; background:#f6f6f6; padding:1.5em;">
| date      = May 4, 2015
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{{:{{LATESTCOMIC}}}}
| title    = Degree-Off
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----
| image    = degree off.png
 
| titletext = I'M SORRY, FROM YOUR YEARS OF CONDESCENDING TOWARD THE 'SQUISHY SCIENCES', I ASSUMED YOU'D BE A LITTLE HARDER.
 
}}
 
  
==Explanation==
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<span style="position: absolute; left:0; padding-top:1.35em; font-size: 105%;"><span class="no-link-underline">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[[File:new topic.png|21x21px|link={{LATESTCOMIC}}#Discussion]][[{{LATESTCOMIC}}#Discussion|&nbsp; </span>'''View comic discussion''']]</span><br><br></div>
{{Incomplete|Unfinished. More detailed introduction and explain title text.}}
 
  
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== New here? ==
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<div style="float:right; margin: 0 0 1em 1em">{{Special:ContributionScores/10/30/nosort,notools}}<div style="font-size:0.85em; width:28em; font-style:italic">[[Special:ContributionScores|Lots of people]] contribute to make this wiki a success. Many of the recent contributors above have [{{fullurl:Special:Contributions|contribs=newbie}} just joined]. You can do it too! Create your account [[Special:UserLogin/signup|here]].</div></div>
  
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You can read a brief introduction about this wiki at [[explain xkcd]]. Feel free to [[Special:UserLogin/signup|create an account]] and contribute to the wiki! We need explanations for xkcd [[:Category:Incomplete explanations|comics]], [[:Category:Characters|characters]], [[What If? chapters|''What If?'' articles]], and [[:Category:xkcd|everything in between]]. If it is referenced in an [[xkcd]] comic, it should be here.
  
[[Cueball]], [[Hair Bun Girl]], and [[Megan]] appear to be on a talk show called Degree-Off, hosted by [[Hairy]], where representatives of different fields, in this case, physics, biology, and chemistry, explain why their fields are best and why to get a degree in the field. The title "Degree-Off" is a portmanteau of "{{w|Academic degree|degree}}", as in the recognized completion of studies at a school or university,  and "{{w|face-off}}", a direct confrontation between two people or groups.
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* If you're new to wiki editing, see the [[explain xkcd:Editor FAQ]] for a specific guidance to this wiki and the more general help on [[mw:Help:Editing pages|how to edit wiki pages]]. There's also a handy {{w|Help:Cheatsheet|wikicode cheatsheet}}.
  
The host asks Cueball to go first. He lightheartedly tells a story about {{w|Richard Feynman}}, finishing with a quote. The quote "all science is either physics or stamp collecting." was said by {{w|Ernest Rutherford}}, not Richard Feynman, implying either [[Cueball]] misattributes the quote, or that his story is quite long. During the Manhattan Project in Los Alamos, Richard Feymann got bored because of the isolation and started learning lock picking on the secret documents safes. Using these new skills, he played lots of pranks on his colleagues, like leaving notes and spooking them into believing there was a spy among them (which, of course, {{w|Klaus_Fuchs|there was}}). The reference to stamp collecting is the abstract idea that all other sciences are aggregates of physics and what they study are simply interesting instances of complex behavior derived from basic physics.
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* Discussion about the wiki itself happens at the [[explain xkcd:Community portal|Community portal]].
  
Hair Bun Girl, the representative for biology goes next, showing that through their efforts, biology has helped reduce disease ("slaying" {{w|Four_Horsemen_of_the_Apocalypse#As_infectious_disease|Pestilence}}). She accuses physics of creating a new weapon of destruction from gathering in the desert (likely referring to the {{w| Manhattan Project}}, conducted in the {{w|New Mexico desert}}), insisting that biologists are the true heroes. Physics is taken aback, having believed it would be a fun activity, which Biology refutes, saying he must have been thinking of Stamp Collecting, which was mentioned in the earlier quote. Megan, the representative for chemistry, does not speak during the comic.
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* You can browse the comics from the [[List of all comics (full)|list of all comics]] or by navigating the category tree at [[:Category:Comics]].
  
<div class="toccolours mw-collapsible mw-collapsed">
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* The incomplete explanations are listed [[:Category:Incomplete explanations|here]]. Feel free to help out by expanding them!
This graph shows the death rate from infectious disease in USA, similar to that shown in the comic presented by Hair Bun Girl, as both have the range of 1900-2000. It probably served as inspiration to Randall.
 
<div class="mw-collapsible-content">[[File:Crude_Infectious_Disease_Mortality_Rate_in_the_United_States_from_1900_Through_1996.gif]]</div>
 
</div>
 
  
Continuing on the Four Horsemen theme, the title text in {{w|all caps}} refers to the mode of speech of {{w|Terry Pratchett}}'s character {{w|Death_(Discworld)|Death}}. He mocks physics and physicists for not being harder. Referring to the fact that physicists sometimes see their science as being the most {{w|hard science}} of sciences and demean other sciences for being soft sciences (as in [[435: Purity]]) or "squishy". By calling the physicist squishy, Death might be referring to the fragility of the human body which led to his death, or the state of that body once death has had time to set in. According to [[435: Purity]], the only subject harder or purer than physics is mathematics.
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== Rules ==
  
The whole comic might be a subtle hint by Randall on his stance against the [http://rationalwiki.org/wiki/Anti-vaccination_movement anti-vaccination movement], the physicist Cueball being the anti-vaxxer, the biologist Hair Bun Girl showing the success of vaccinations, making Cueball speechless.
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Don't be a jerk!
  
==Transcript==
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There are a lot of comics that don't have set-in-stone explanations; feel free to put multiple interpretations in the wiki page for each comic.
:[Hairy is acting as the host of a TV talk show, ''Degree-Off''. Cueball, Hair Bun Girl, and Megan are acting as representatives of Phys (Physics), Bio (Biology), and Chem (Chemistry) respectively. They each stand behind their own {{w|Lectern}} with the respective subject label.]
 
  
:Hairy: Welcome to the ''Degree-Off'', where we determine which field is the best! Physics, wanna go first?
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If you want to talk about a specific comic, use its discussion page.
:Cueball: Sure! I'd like to tell the story of Richard Feynman's Manhattan project lockpicking pranks...
 
  
:Cueball: ...and as he said, "all science is either physics or stamp collecting."
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Please only submit material directly related to xkcd and, of course, only submit material that can legally be posted and freely edited. Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.
:Cueball: Thank you.
 
:Hairy: ''Great!'' Bio, you wanna go next?
 
:Hair Bun Girl: Okay.
 
  
:[A graph labeled "Per 100,000 is shown above Hair Bun Girl]
+
If you need assistance from an [[explain xkcd:Administrators|admin]], post a message to the [[explain xkcd:Community portal/Admin requests|Admin requests]] board.
:Hair Bun Girl: This is a graph of the death rate from infectious disease in this country.
 
  
:[Hair Bun Girl raising her left hand]
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[[Category:Root category]]
:Hair Bun Girl: The heroes of my field have ''slain'' one of the four horsemen of the apocalypse.
 
  
:[Hair Bun Girl pointing at Cueball]
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Recent comments: {{Special:RecentChanges|namespace=1}}
:Hair Bun Girl: While the heroes of ''your'' field gathered in the desert to create a new one.
 
 
 
:Cueball: ...Jeez, what the hell? I thought this was supposed to be fun and lighthearted!
 
:Hair Bun Girl: ''You must have been thinking of stamp collecting.''
 
 
 
==See also==
 
*Different scientific fields, including physics, biology, and chemistry are compared in terms of purity in  [[435: Purity]].
 
*Most fields are criticized in [[1052: Every Major's Terrible]].
 
 
 
{{comic discussion}}
 
<!-- Include any categories below this line. -->
 
 
 
[[Category:Comics featuring Cueball]]
 
[[Category:Comics featuring Megan]]
 
[[Category:Comics featuring Hairy]]
 
[[Category:Comics featuring Hair Bun Girl]]
 
[[Category:Science]]
 
[[Category:Charts]]
 
[[Category:Physics]]
 
[[Category:Biology]]
 
[[Category:Chemistry]]
 
[[Category:Portmanteau]]
 

Latest revision as of 06:19, 3 January 2026

Welcome to the explain xkcd wiki!
We have an explanation for all 3222 xkcd comics, and only 70 (2.2%) are incomplete. Help us finish them!

 Go to this explanation

Latest comic[edit]

Dental Formulas
I mean, half of these are undefined. And your multiplication dots are too low; they look like decimal points.
Title text: I mean, half of these are undefined. And your multiplication dots are too low; they look like decimal points.

Explanation[edit]

Ambox warning blue construction.png This is incomplete:
This page was created by your new dentist, who has a pure math background. Don't remove this notice too soon. If you can fix this issue, edit the page!

A dental formula specifies the number of teeth of each type on each side of the jaw for a given species, with dots separating the numbers. There are two rows, representing the upper and lower jaw, separated by a horizontal line. The number of incisors is indicated first, canines second, premolars third, and finally molars, so the formula in the comic would represent 3 incisors, 1 canine, 3 premolars, and 1 molar on each side of the upper jaw, and equal numbers in the lower jaw except only 2 premolars. This is the dental formula for the cat family. The adult human dental formula is 2.1.2.3 for both the upper and lower jaw.

Cueball is (wrongly) treating a dental formula as an arithmetic expression, with the line indicating division and the dots indicating multiplication. In the title text his statement that half the formulae are undefined refers to animals that lack one of the four types of teeth in the lower jaw, leading to a zero in the "denominator" of the dental formula and an undefined division expression. He also notes that the "dots are too low", as in fact the dots in a dental formula are period characters and aren't meant to imply multiplication, which uses middle dot characters.

The word 'mammologist' is an alternate spelling of 'mammalogist', for one who studies mammals. Or, in some cases, specifically studying the mammaries (i.e. breasts) which mark out mammals in general. The specific study of teeth might be termed 'odontology', so we should assume that the experts who Cueball is referencing are not specifically tooth-focused, merely using this particular specialism to help with their own particular, arguably far wider, brief that is not so entirely fixated solely upon any particular body parts.

Transcript[edit]

Ambox warning green construction.png This is one of 46 incomplete transcripts:
Don't remove this notice too soon. If you can fix this issue, edit the page!
[Cueball and Megan are standing in front of a whiteboard, on which is written
3.1.3.1
3.1.2.1
along with a drawing of a tooth and some other scribbles.]
Cueball: Do mammologists think these are hard?
Cueball: I mean this one just evaluates to 3/2.
[Caption below the panel:]
Mathematicians encounter dental formulas

comment.png  Add comment      new topic.png  Create topic (use sparingly)     refresh discuss.png  Refresh 

Discussion

Make changes, try things out, or just have fun with the wiki here! Just leave everything above the line alone, please.


This is a test. PoolloverNathan[stalk the blue seas] 20:48, 16 March 2021 (UTC)

This is not. —While False (museum | talk | contributions | logs | rights | printable version | page information | what links there | related changes | Google search | current time: 10:23) 18:38, 17 November 2022 (UTC)
A foreign student asked me to help fight against his math teacher. That was unusual. He was in that class for just a couple of weeks. The teacher's phone number was sent to me. The student asked me to spam-call the teacher. 172.71.155.55 22:58, 18 September 2023 (UTC)

here i'm just messing around in html, ignore this

furhhfghure guyrburgryhuyvfr "rvhru"

interesting way of writing quotations xd

hmmm this one of putting "<p>" in a line break will come in handy for when i want it to start at the same place than the first line

Please beware that <p> on mediawiki also disables automatic paragraph breaks, so you need a closing </p> or you'll break automatic paragraph formatting for the rest of the page. Zmatt (talk) 22:06, 31 July 2024 (UTC)

edit: da hek did that "</div>" come from An user who has no account yet (talk) 14:14, 13 October 2023 (UTC)

hi uh its hard to get here. is this a reference to undocumented feature??? hmm... this is interesting.
108.162.241.216 02:05, 23 November 2023 (UTC)

Tomato soup.jpg Soup


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yum yum [citation needed]

Hiuiedeixgeyceiyedhcdiedcve {{trout}}

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Lots of people contribute to make this wiki a success. Many of the recent contributors above have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to create an account and contribute to the wiki! We need explanations for xkcd comics, characters, What If? articles, and everything in between. If it is referenced in an xkcd comic, it should be here.

  • The incomplete explanations are listed here. Feel free to help out by expanding them!

Rules[edit]

Don't be a jerk!

There are a lot of comics that don't have set-in-stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

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Recent comments:

1 March 2026

     01:41 

Talk:3201: Proof Without Content‎‎ (2 changes | history) . . (+134). . [81.179.199.253‎; 206.176.159.8‎]

     

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(cur | prev) . . (+46). . 81.179.199.253 (talk) ([proof needed] instead of [citation needed]: 'Unsign'ing it. Also deheadering it.)

     

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(cur | prev) . . (+88). . 206.176.159.8 (talk) ([proof needed] instead of [citation needed]: new section)

28 February 2026

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Talk:135: Substitute‎‎ (3 changes | history) . . (+12). . [42.book.addict‎; 81.179.199.253‎; 219.77.246.222‎]

     

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(cur | prev) . . (-1). . 81.179.199.253 (talk) (Undo revision 407381 by 219.77.246.222 (talk) No reason to move it achronologically to the start...)

     

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Talk:3211: Amperage‎‎ (4 changes | history) . . (+3,431). . [Yorkshire Pudding‎; 2600:6c54:4e00:99c:67b7:d578:30ed:2471‎; 82.132.239.97‎ (2×)]

     

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Talk:3213: Dental Formulas‎‎ (3 changes | history) . . (+1,481). . [EebstertheGreat‎; 70.40.90.209‎; 2a00:23cc:d248:8901:30f4:4052:a4f7:386e‎]

     

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27 February 2026

N    22:52 

Talk:3213: Dental Formulas‎‎ (7 changes | history) . . (+1,371). . [Xkdvd‎; AmethystSky14‎; TheusafBOT‎; 97.116.61.145‎; 2a00:23ee:10c8:110f:d992:d45:1c7a:df02‎; 64.201.132.210‎ (2×)]

     

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Talk:3212: Little Red Dots‎‎ (4 changes | history) . . (+997). . [Xkdvd‎; 82.13.184.33‎; 2600:8807:2180:4b00:b947:5804:53d5:72e2‎; 160.39.41.199‎]

     

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26 February 2026

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Talk:3211: Amperage‎‎ (7 changes | history) . . (+1,359). . [Yorkshire Pudding‎; 81.179.199.253‎; BaddDadd‎ (5×)]

     

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(cur | prev) . . (+1). . 82.132.236.204 (talk) (My error. ;))

     

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