Pi

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...

Our Pi Playlist (more videos): http://bit.ly/PiPlaylist

Some stuff about Pi, the "celebrity number'.

This video features maths-loving author Alex Bellos (http://alexbellos.com/) and Professor Roger Bowley from the University of Nottingham.

Alex's brilliant book can be found at...
UK: http://www.amazon.co.uk/Alexs-Adventures-Numberland-Alex-Bellos/dp/1408809591/ref=pd_sim_b_1
US: http://www.amazon.com/dp/1416588280/ref=cm_sw_su_dp

OUR PI VIDEOS ---
ALEX BELLOS AND ROGER DISCUSS ITS HISTORY http://www.youtube.com/watch?v=yJ-HwrOpIps
BOUNCING BALLS AND A STRANGE PROPERTY http://www.youtube.com/watch?v=abv4Fz7oNr0
MATCHES HELP FIND PI http://www.youtube.com/watch?v=sJVivjuMfWA
THE SOUND OF PI http://www.youtube.com/watch?v=wPn4tgmU8ek