Inventor Dean Kamen gives a 5-minute talk about the extraordinary prosthetic arm he’s developing at the request of the US Department of Defense, to help the 1,600 "kids" who've come back from Iraq without an arm (and the two dozen who’ve lost both arms). Kamen's commitment to using technology to solve problems, and his respect for the human spirit, have never been more clear than in this deeply moving clip. (Recorded March 2007 in Monterey, California. Duration: 05:41.)