Cicada 17

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...

Why do cicadas emerge every 17 years - featuring Steve Mould.
Steve is on Twitter at https://twitter.com/MouldS

See Steve talkabout Benford's Law at: http://youtu.be/XXjlR2OK1kM
And discuss Pi at: http://youtu.be/ZPv1UV0rD8U