Brussels Sprouts

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...

More on the Euler Characteristic coming soon. Featuring Dr Teena Gerhardt from Michigan State University.

John Conway (sprouts co-inventor) has featured in these Numberphile videos: http://bit.ly/JohnConway