3435

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...

3435 is Matt Parker's "ex" favourite number - but they are still on good terms.

Matt Parker’s website: http://standupmaths.com/

Filmed at the Champagne Bar at St Pancras train station in London.