Smart bandages, including this one from Corventis, can transmit cardiac data in real time from a patient's body to a doctor. Courtesy of Mark Dastrup hide caption

itoggle caption Courtesy of Mark Dastrup

A group of teenagers take a morning jog at the Wellspring Academy in Reedley, Calif., in 2009. The school specializes in helping teens and college students lose weight. A new study shows teens who remain obese risk a lifetime of chronic health problems and poverty. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

An unidentified western patient receives a stem cell treatment for heart disease at a clinic in Bangkok, Thailand on Feb. 7, 2007. STR/AFP/Getty Images hide caption

itoggle caption STR/AFP/Getty Images