Hugh Herr was one of the best free climbers in New England. His career took a turn in 1982, when he was caught in a blizzard on Mount Washington. Herr spent three nights in -20 °F temperatures. By the time he was rescued, he'd suffered extreme frostbite. Both of his legs had to be amputated. Instead of deciding he was broken, Herr started developing artificial limbs and returned to climbing. Today he directs the Biomechatronics Research Group at the MIT Media Lab, where he is pioneering new prostheses and exoskeletons. In this Ted Talk, Herr explains how they're using technology to eliminate disabilities.