Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsHalf-Life of a Radioactive Decayhttp://demonstrations.wolfram.com/HalfLifeOfARadioactiveDecay/]]>http://demonstrations.wolfram.com/HalfLifeOfARadioactiveDecay/