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xkcd

Lift is caused by red arrows pointing upwards. OK, actually it's a bit more complicated than that. Credit: NASA

What causes lift?

By Phil Plait 5 years ago
The major advances in evolution happened long, long ago. Credit: Stated Clearly

Why did single cells start to cooperate?

By Phil Plait 5 years ago
A frame from the huge xkcd panel “Time” (frame 403 if you’re curious). Credit: Randall Munroe

Xkcd and "Time"

By Phil Plait 9 years ago

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