In this image, three stereoscopic projectors mounted on the floor and one on the ceiling display a computer-animated body. Looking through the goggles, researchers can watch its bloodstream turn from white to red as aspirin travels through it. Sensen hopes to develop computer simulations that will model the progression of diseases like Alzheimer's and diabetes and help scientists quite literally look for cures. Updated to reflect what's happening inside a real patient, the technology could also help doctors diagnose and treat cancer. "You could stand inside your patient," Sensen says, "and see how big the tumor is, how to treat it, and what the outcome will be."