Super-fast way to tie Shoelaces

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...

Just for fun... Featuring Matt Parker. Some REAL knot action at: http://bit.ly/Knot-a-Phile

More videos with Matt: http://bit.ly/standupmaths --- And Matt's book: http://bit.ly/Make_Do_Numberphile