A simulation of the N-body problem for iDevice. It’s free, too. Enjoy! Multiple pendulums next week.
http://itunes.apple.com/us/app/nbody/id347962727?mt=8
As Poincaré himself put it, “One is struck by the complexity of this figure I am not even attempting to draw. Nothing can give us a better idea of the complexity of the three-body problem and of all problems of dynamics where there is no holomorphic integral and Bohlin’s series diverge.”