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October 24, 2007

Turning a sphere inside out

If you hang out with math nerds enough, you might eventually hear them talk about crazy things like turning a sphere inside out, without cutting or pinching its surface. In some circles, I think this is the math-nerd equivalent of a pissing contest. Well, I've hung out with them enough to hear it, but never gotten a good answer about how to do it. This very nicely produced little video (complete with Pixar-esque animation and human narration) explains it in a very accessible way.

(Tip to Scott Aaronson.)

posted October 24, 2007 01:13 PM in Pleasant Diversions | permalink