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Hello there.

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

How to make a Klein Bottle (in three dimensions)

How to make a Klein Bottle (in three dimensions)

Cliff Stoll on how he makes Klein Bottles from glass.

More videos on Klein Bottles: http://bit.ly/KleinBottles
ACME Klein Bottles: http://bit.ly/ACME_Klein

Hunt for the Elusive 4th Klein Bottle

Hunt for the Elusive 4th Klein Bottle

The man with 1,000 Klein Bottles UNDER his house

The man with 1,000 Klein Bottles UNDER his house