(Photo: Kackson Smith/UVA)Medical schools hire actors to pretend to have certain ailments. Medical students then attempt to diagnose those afflictions. Ryan Jones, a medical student at the University of Virginia, examine...

Doctors can implant his tiny sensor package developed by researchers at the Ecole Polytechnique Fédérale de Lausanne in Switzerland. A battery worn on a patch outside of the body gives it energy. When senso...