  We study a certain family of discrete dynamical processes introduced by
Novikoff, Kleinberg and Strogatz that we call flashcard games. We prove a
number of results on the evolution of these games, an in particular we settle a
conjecture of NKS on the frequency with which a given card appears. We
introduce a number of generalizations and variations that we believe are of
interest, and provide a large number of open questions and problems.
