Turning a Sphere Inside Out: A Video Tutorial

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Ratzinger
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great video on how turning a sphere inside out

http://video.google.com/videoplay?docid=-6626464599825291409

enjoy!
 
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Makes you wonder how people did it without the aid of computers.

Thanks for the link!
 
I think I would have been more entertained by Microsoft Sam's voice :P but interesting nevertheless.
 
That was pretty cool. I would like to see the other methods of doing this.
 
What exactly is this used for? Is this topology?
 
Yes, it's one of the more famous problems in topology.