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Hello there.

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

The Four 4s

The Four 4s

It was a famous problem for many years - until a physics genius solved it all the way to infinity.

Featuring author Alex Bellos.

Extras from this interview: https://youtu.be/jv8dITbiheQ

More Numberphile videos with Alex: http://bit.ly/Bellos_Playlist

Binder Clip Climber

Binder Clip Climber

RSA-129

RSA-129