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hi <span style="color:#0645AD"> Qoiuoiuoiu (talk) </span>  23:00, 15 January 2025 (UTC)
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Revision as of 16:00, 24 December 2025

Welcome to the explain xkcd wiki!
We have an explanation for all 3214 xkcd comics, and only 62 (1.9%) are incomplete. Help us finish them!

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Latest comic

Carbon Dating
This dating is corroborated by the presence of stone tools at the site, rather than earlier and less effective helium ones.
Title text: This dating is corroborated by the presence of stone tools at the site, rather than earlier and less effective helium ones.

Explanation

Ambox warning blue construction.png This is incomplete:
This page was created recently by a WOODEN PICKAXE. Don't remove this notice too soon. If you can fix this issue, edit the page!

Carbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. This method is commonly used by archaeologists and is invaluable in terms of predicting the time a piece of organic matter (such as a fossil) came from. It uses the fact that carbon consumed by living organisms contains a fixed ratio of the carbon isotopes C12, C13, and C14. Since C14 is radioactive, it decays over time. By measuring how much C14 is left in the remains of an organism, archaeologists can determine how long ago that organism consumed carbon, and thus how long ago it lived.

Here, however, Ponytail, in the role of a cosmologist, takes a rather different perspective on using carbon for dating. She is interested only in the mere presence of carbon, which tells her that the skeleton being studied was formed after the first carbon in the universe was created in the first round of stars fusing elements, 13.6 billion years ago. This is not useful information for judging artifacts originating on Earth, which is itself less than 5 billion years old, since it would apply to all of them.

The title text looks like the kind of statement that would provide corroborative dating evidence for an archaeological site. The type and composition of tools can help to place a site, relative to others, on a developmental timeline. Here, however, they claim that the presence of stone tools dates the site as later than a non-existent age of helium tools. Tools made out of stone, usually dating from the Stone Age, are often solid and durable, making them great choices for heavy duty tasks, and well-preserved in the archaeological record. Helium is a gas and is difficult to shape into a solid mass for use as a tool[citation needed]. It would also be near impossible to identify such tools if they had existed, since they would tend to disperse easily. Helium was produced in great quantities after the Big Bang, accounting for about ~25% of the elements produced by the early universe, so would have been available before stone was, but there were no people around at the time to fashion tools from it.

Transcript

Ambox warning green construction.png This is one of 43 incomplete transcripts:
Don't remove this notice too soon. If you can fix this issue, edit the page!
[Ponytail, standing, is pointing at a blackboard containing a drawing of a skull and some bones/bone fragments, as well as a graph and some lines of text. She is speaking to Cueball and Megan, who are standing beside her.]
Ponytail: The high carbon content of the skeleton indicates that the individual lived less than 13.6 billion years ago, after the first round of stellar nucleosynthesis.
[Caption below the panel:]
Cosmologist carbon dating

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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: 11:08) 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!

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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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