Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsBending of Light by a Starhttp://demonstrations.wolfram.com/BendingOfLightByAStar/]]>http://demonstrations.wolfram.com/BendingOfLightByAStar/Nutation of a Symmetric Tophttp://demonstrations.wolfram.com/NutationOfASymmetricTop/]]>http://demonstrations.wolfram.com/NutationOfASymmetricTop/