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:

https://www.youtube.com/watch?v=iMGvTYDC5MA

Canadian money smell test video:

https://www.youtube.com/watch?v=2KEQCudRqbY

Shapes of constant width:

http://mathsgear.co.uk/products/shapes-of-constant-width-in-acrylic-set-of-4

Solids of constant width video:

https://www.youtube.com/watch?v=a65VLLFYU6k

Solids of constant width at Maths Gear:

http://mathsgear.co.uk/products/solids-of-constant-width?lssrc=related

Tau vs Pi smackdown:

https://www.youtube.com/watch?v=ZPv1UV0rD8U

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