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Cool Topology Video

Via Scott Aaronson and John Baez, a video on how to turn a sphere inside out without cutting or creasing it.  I have just finished watching this with my daughter, Zoe.  She was fascinated and watched it right through to the end.  And, from the comments she made, I got the distinct impression that she was understanding the 3-dimensional moves quicker than I was. I found this a little unsettling: she might actually be brighter than me!

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