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

Shapes and Solids of Constant Width

Shapes and Solids of Constant Width

Brady Haran
Steve Mould
Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

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Steve Mould discusses shapes and solids of constant width, including the Reuleaux triangle and the UK's 50p coin.

Brown papers: http://bit.ly/brownpapers

87,539,319

87,539,319
Pi and Four Fingers

Pi and Four Fingers