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xkcd.com

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

Telescope Types 17 Dec 2025, 5:00 am

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 15 Dec 2025, 5:00 am

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 12 Dec 2025, 5:00 am

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.

Fishing 10 Dec 2025, 5:00 am

'That's definitely above the catch-and-release size minimum for planetesimals.' 'I'm going to throw it back anyway.'

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