74 is cracked
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...
A breakthrough by a Numberphile viewer (with help from some computers).
Extra footage: https://youtu.be/d6nUVa8EtlU
Original video: https://youtu.be/wymmCdLdPvM
See the paper by Sander Huisman: http://bit.ly/Sander_Paper
Discussed by Tim Browning from the University of Bristol.
