Borromean Ribbons

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 is talking about Borromean links again - this time using ribbons.

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

Knots: http://bit.ly/Knot-a-Phile

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

Music by Alan Stewart