Looking at Perfect Shuffles
How do cards move in a perfectly shuffled deck.
This continues on Numberphile2 at: http://youtu.be/UawZn7X42OM (including a look at 52 card decks)
Featuring Federico Ardila from San Francisco State University.
Federico: https://twitter.com/FedericoArdila
More cards and shuffling videos: http://bit.ly/Cards_Shuffling