Modern-day robotics has already advanced to the point where we can create robot limbs sophisticated enough to be attached to machines and perform tasks efficiently enough to outpace humans in certain areas. A significant problem with these limbs, though, is that they're just too expensive, and not precise enough to outpace humans across the board. However, DARPA has developed a cheap robotic hand that can almost match human performance in dexterous activities, like changing a tire.