Peter Doyle has invented an interesting game that he call Yin and
Yang. This game can be easily played by the class and illustrates
some limitations of the theory of card shuffling that has been in
the news a great deal under the topic "seven shuffles suffices".
Two attempts to explain the theory of shuffling developed by
Reeds, Bayer, and Diaconis are given written by Brad Mann and
Charles Grinstead.
There is a True BASIC written by John Finn and a Mathematica
programs written by Charles Grinstead to simulate the game of
Yin and Yang to compare your class results. (See computer
resources)