Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsBuilding a Velocity Sensorhttp://demonstrations.wolfram.com/BuildingAVelocitySensor/]]>http://demonstrations.wolfram.com/BuildingAVelocitySensor/Understanding Runge-Kuttahttp://demonstrations.wolfram.com/UnderstandingRungeKutta/]]>http://demonstrations.wolfram.com/UnderstandingRungeKutta/