 When you see someone walking with an artificial limb, they don't have full neural control over it. Instead, they're likely using a robotic controller to move the prosthesis at a gait that's been pre-programmed into it. But researchers at MIT are trying a new procedure that through surgical amputation reconnects muscles to the body's own nervous system. The result, patients able to walk faster, avoid obstacles, and do things like climb stairs much more naturally than people with a traditional amputation. Sherry Preston, ABC News.