http://www.ted.com Alan Russell studies regenerative medicine -- a breakthrough way of thinking about disease and injury by helping the body to rebuild itself. He shows how engineered tissue that "speaks the body's language" has helped a man regrow his lost fingertip, how stem cells can rebuild damaged heart muscle, and how cell therapy can regenerate the skin of burned soldiers. This new, low-impact medicine comes just in time, Russell says -- our aging population, with its steeply rising medical bills, will otherwise (and soon) cause a crisis in health care systems around the world. Some graphic medical imagery.