Number Line

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...

How do you measure with numbers if they have no size?

Here is part two: http://www.youtube.com/watch?v=aIggWlKr41w

Featuring Simon Pampena - https://twitter.com/mathemaniac