Subtracting Paperclips

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...

Part One: https://youtu.be/wGkvyN6s9cY

Featuring Tadashi Tokieda.

More Tadashi videos: http://bit.ly/tadashi_vids

Raw paperclips slow motions: https://youtu.be/zuX5yy_93JA

Video by Brady Haran and Pete McPartlan (animations by Pete)