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''Welcome to the Explain XKCD wiki''
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__NOTOC__{{DISPLAYTITLE:explain xkcd}}
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<center>
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<font size=5px>''Welcome to the '''explain [[xkcd]]''' wiki!''</font><br>
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We have an explanation for all [[:Category:All comics|'''{{#expr:{{PAGESINCAT:All comics|R}}-1}}''' xkcd comics]],
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<!-- Note: the -1 in the calculation above is to discount "comic" 404,
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    which is not really a comic, even though we've categorised it so. -->
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and only {{PAGESINCAT:Incomplete explanations|R}}
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({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 0}}%) [[:Category:Incomplete explanations|are incomplete]]. Help us finish them!
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== Latest comic ==
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== Explaining ==
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Please sign up for an account and contribute to the Explain XKCD wiki!  We need explanations for comics, characters, themes, memes and everything in between.  If it is referenced in an XKCD comic, it should be in here.
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Latest revision as of 07:50, 17 April 2024

Welcome to the explain xkcd wiki!
We have an explanation for all 2933 xkcd comics, and only 6 (0%) are incomplete. Help us finish them!

Latest comic

Go to this comic explanation

Elementary Physics Paths
==COSMOLOGY==> 'Uhhh ... how sure are we that everything is made of these?'
Title text: ==COSMOLOGY==> 'Uhhh ... how sure are we that everything is made of these?'

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: Created by a VERY NOT SIMPLE PARTICLE - Please change this comment when editing this page. Do NOT delete this tag too soon.

This comic explores the complexities of understanding the fundamental building blocks of the universe.

The absurdity of understanding everything starting from just understanding basic particles is similar to the fallacy presented in 1570: Engineer Syllogism. Quantum physics, as shown in the comic, makes what at first glance are “simple” particles very complicated.

In the first panel, Cueball expresses the idea that if he understands the behavior of tiny particles, he'll understand everything. This reflects a common scientific pursuit to uncover the basic principles underlying all physical phenomena.

The concepts of reductionism and then antireductionism (or holism) are demonstrated by following the left causal path using a 'traditional' physical approach. This is shown in everyday life, from things like a baseball curving through the air, to how a mirror reflects light.

However, the comic then splits into two branches representing different fields of physics: condensed matter physics and quantum field theory.

In the Condensed Matter Physics branch, Cueball encounters a cloud of particles, which symbolizes the complexity that arises when simple particles combine to produce complex behaviors. This highlights the challenge of predicting macroscopic properties from microscopic interactions, a central theme in condensed matter physics.

In the Quantum Field Theory branch, Cueball is faced with the realization that particles at the quantum level aren't as simple as initially thought. Quantum Field Theory deals with the fundamental particles and forces of nature, and it describes a complex world where particles can behave as both waves and particles simultaneously, among other strange phenomena.

Some other examples of problems in Quantum Field Theory are that particles never stop moving, they can sometimes pass through "unpassable" barriers, you can never know the spin and position of them at the same time, and everything is governed by probability. One famous example of this is Schrödinger's cat. Schrödinger's cat is a mind experiment where a cat is placed in a box along with a radioactive sample. Also inside is a Geiger counter connected to a poison. The radioactive sample has a 50/50 chance of decaying, therefor setting off the Geiger counter, releasing the poison and killing the cat. Schrödinger points out that according to Quantum Field Theory, the cat is neither dead nor alive, it's instead in a superposition of being both dead and alive.

It is noted that Schrödinger was arguing against Quantum Field Theory, stating it a 'quite ridiculous case'. However, because of the complexity of the scenario, many people believed he was added to Quantum Theory instead of denying it.

The title text creates an ASCII depiction of the arrows used in the comic image, adding another layer by introducing the field of cosmology, which deals with the large-scale structure and history of the universe. It humorously suggests that even our understanding of the most fundamental particles might not be as certain as we think, raising questions about the nature of existence itself.

Overall, the comic illustrates the challenges and complexities inherent in trying to understand the fundamental nature of reality.

Transcript

[Cueball gestures at a particle, represented as a dot with motion lines around it.]
Cueball: Everything is made of tiny particles. If I understand those, I'll understand everything!
[The comic splits into two branches.]
[Condensed Matter Physics branch]
[Cueball is fretting over a cloud of particles.]
Cueball: Oh no.
Cueball: Simple particles can combine to produce complex behaviors.
[Quantum Field Theory branch]
[Cueball is fretting over the same particle as in the first panel.]
Cueball: Oh no.
Cueball: These particles aren't simple!


Is this out of date? Clicking here will fix that.

New here?

Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed 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 sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes and everything in between. If it is referenced in an xkcd web comic, it should be here.

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

Rules

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.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to (and helping everyone better understand) 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.

If you need assistance from an admin, post a message to the Admin requests board.