Money Catching

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...

Tadashi Tokieda puts $20 on the line...

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

Paperclips: https://youtu.be/wGkvyN6s9cY

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