“What would you attempt to do if you knew you could not fail?” asks Regina Dugan, 2012 director of DARPA, the Defense Advanced Research Projects Agency. In this breathtaking talk she describes some of the extraordinary projects , a robotic hummingbird, a prosthetic arm controlled by thought, and, well, the internet, that her agency has created by not worrying that they might fail. Presented here by TEDTalks.