Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsSpread of a Gaussian Wave Packet with Timehttp://demonstrations.wolfram.com/SpreadOfAGaussianWavePacketWithTime/]]>http://demonstrations.wolfram.com/SpreadOfAGaussianWavePacketWithTime/Kepler Orbitshttp://demonstrations.wolfram.com/KeplerOrbits/]]>http://demonstrations.wolfram.com/KeplerOrbits/Fraunhofer Diffraction through a Rectangular Aperturehttp://demonstrations.wolfram.com/FraunhoferDiffractionThroughARectangularAperture/]]>http://demonstrations.wolfram.com/FraunhoferDiffractionThroughARectangularAperture/