Dr. Hugh Herr holds a prosthesis outside his office at the Massachusetts Institute of Technology, Wednesday, Dec. 19, 2002, in Cambridge, Mass. Twenty years ago, Herr and his friend, Jeffrey Batzer, were rescued after an ice climbing accident on Mount Washington in New Hampshire. Both men suffered severe frostbite, with Herr losing his legs six inches below the knees. Now Herr teaches an anatomy class at Harvard Medical School, has developed improved prostheses for knees andfeet, and has seven patents. (Photo by Elise Amendola/AP Photo)