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

The Useless Number

The Useless Number

Brady Haran
Barry Mazur, Complex Numbers

One of the first people to stumble over imaginary numbers (namely the square root of -15) thought it was "subtle" and "useless".

Featuring Barry Mazur.
Extra footage from this interview: http://youtu.be/i4GCd2xOCDg
Barry's book on this topic: http://bit.ly/RootMinusFifteen

Barry on scale and similarity: http://youtu.be/ItiFO5y36kw

58 and other Confusing Numbers

58 and other Confusing Numbers
Little Professor (Dr Grime's Toy Story)

Little Professor (Dr Grime's Toy Story)