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

How Pi was nearly changed to 3.2

How Pi was nearly changed to 3.2

Brady Haran
James Grime, Pi, History

The State of Indiana nearly passed a law which would have made Pi equal 3.2 - strange but true.

More Pi videos from Numberphile: http://bit.ly/PiPlaylist

This video features Dr James Grime - https://twitter.com/jamesgrime

The video about squaring circles: https://www.youtube.com/watch?v=CMP9a2J4Bqw

A note to potentially disgruntled viewers about making this video longer to include the subsequent lengthy discussion about squaring circles: http://periodicvideos.blogspot.co.uk/2013/03/continue.html

Pi with Pies (director's slice)

Pi with Pies (director's slice)
Calculating Pi with Real Pies

Calculating Pi with Real Pies