Epic Circles

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...

The man who loved circles (Objectivity): https://youtu.be/AzmUCL1OHhs

Pappus chains, circle inversion and a whole lot more in this EPIC video with Simon Pampena.