xkcd.com

xkcd.com: A webcomic of romance and math humor.

Pole Vault Pole 18 Dec 2025, 9:00 pm

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

Telescope Types 16 Dec 2025, 9:00 pm

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 14 Dec 2025, 9:00 pm

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.

Apples 11 Dec 2025, 9:00 pm

The experimental math department's budget is under scrutiny for how much they've been spending on trains leaving Chicago at 9:00pm traveling at 45 mph.

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