Hugh Herr and his colleagues at MIT’s Biomechatronics group develop artificial limbs that complete or augment the human body. His presentation is amazing, but if you’re short on time skip to 13:40. Really, watch the whole thing.
Chinese farmer Sun Jifa found that the prosthetics available to him after he lost his hands in a freak accident were too limiting so he made his own. His can-do attitude and the capabilities of his designs are truly inspirational.