Base 60 (sexagesimal)

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...

The ancient Babylonians used a number system with base 60 (sexagesimal).

Tablet image courtesy of Bill Casselman and Yale Babylonian Collection - more at http://www.math.ubc.ca/~cass/Euclid/ybc/ybc.html

This video features Thomas Woolley - he tweets at https://twitter.com/#!/thomasewoolley