98 and Grafting Numbers

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...

Square roots, strange patterns and a mysterious constant - what are Matt's "grafting numbers" all about? And why is computer programming like skydiving?

Matt Parker's website is http://standupmaths.com/

Filmed at the Champagne Bar at St Pancras train station.