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

Continents 24 Oct 2025, 4:00 am

The inflection point was probably in late 1966 or 1967, so when Neil Armstrong flew to space on Gemini 8, plate tectonics was not widely accepted, but when he landed on the Moon three years later it was the mainstream consensus.

Shielding Chart 22 Oct 2025, 4:00 am

Sharks can occasionally travel short distances through air when pursuing prey, but their attenuation coefficient is pretty high.

Emperor Palpatine 20 Oct 2025, 4:00 am

Many things about Star Wars were not well planned out, but having a 37-year-old in old-age makeup play the Emperor in Return of the Jedi was such an incredible call.

Planetary Rings 17 Oct 2025, 4:00 am

If you don't know where you are on Earth, the angle of satellite dishes can help constrain your latitude. If some of them are pointing straight up, you're probably near the Equator, right under the ring.

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