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Sphere Inside out Part - II - YouTube
https://www.youtube.com/watch?v=x7d13SgqUXg
it is possible to turn a sphere inside out in 3-space with possible self-intersections but without creating any crease, a process often called sphere eversio...
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Sum of Natural Numbers (second proof and extra footage) - YouTube
http://www.youtube.com/watch?v=E-d9mgo8FGk&feature=youtu.be
MAIN VIDEO IS AT: http://youtu.be/w-I6XTVZXww More links & stuff in full description below ↓↓↓ Ed Copeland and Tony Padilla are physicists at the University ...