Computer modeling is a powerful tool for scientific inquiry when experiments are too costly, too dangerous, or simply impossible. Computational physicist David Richard describes how to build a computer model of a human heart, starting from an individual cell and then using data from an actual person to create a realistic representation of a beating heart. Learn some of the tricks and techniques used to combine the power of Sequoia's 1.6 million CPUs providing examples of how doctors and researchers may soon be able to use such simulations to investigate the effects of new drugs on cardiac rhythms or improve the success rate of complex surgical procedures. (#28466)