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It's not who you are underneath. It's what you do that defines you.

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Funny Numbers

Posted on Dec 22, 2025 xkcd.com

In 1899, people were walking around shouting '23' at each other and laughing, and confused reporters were writing articles trying to figure out what it meant.

Pole Vault Pole

Posted on Dec 19, 2025 xkcd.com

My goal in life is to be personally responsible for at least one sports rule change.

Telescope Types

Posted on Dec 17, 2025 xkcd.com

I'm trying to buy a gravitational lens for my camera, but I can't tell if the manufacturers are listing comoving focal length or proper focal length.

Jumping Frog Radius

Posted on Dec 15, 2025 xkcd.com

Earth's r_jf is approximately 1.5 light-days, leading to general relativity's successful prediction that all the frogs in the Solar System should be found collected on the surface of the Earth.

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