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Hello there.

This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Cutting a Klein Bottle in Half

Cutting a Klein Bottle in Half

Brady Haran
Cliff Stoll, Klein Bottles

Klein Bottle enthusiast Cliff Stoll uses a diamond saw on a glass Klein Bottle.

More videos about his bottles: http://bit.ly/KleinBottles

Cliff's site (selling bottles): http://bit.ly/ACME_Klein

Unexpected Shapes (Part 1)

Unexpected Shapes (Part 1)
The Uncracked Problem with 33

The Uncracked Problem with 33