Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsThe Pendulum: From Simple Harmonic Motion to Chaoshttp://demonstrations.wolfram.com/ThePendulumFromSimpleHarmonicMotionToChaos/]]>http://demonstrations.wolfram.com/ThePendulumFromSimpleHarmonicMotionToChaos/