Amazing property of the Canadian one dollar coin you didn't know aboot

Some coins are non circular, but many of there are still shapes of constant width. Like the Canadian Loony and the British 50p coin.

Original Canadian bank note laser video:

Plastic Banknotes and lasers

Canadian money smell test video:

Does Canadian money really smell like...

Shapes of constant width:

http://mathsgear.co.uk/products/shape...

Solids of constant width video:

Maths Gear: 3D Solids of Constant Width

Solids of constant width at Maths Gear:

http://mathsgear.co.uk/products/solid...

Tau vs Pi smackdown:

Tau vs Pi Smackdown - Numberphile

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