Photo Gallery: Beauty in Science 11/27/2009
  Robert Jordan has only one leg, but thanks to a hydraulic prosthesis, he can...
Marco Moog

Robert Jordan has only one leg, but thanks to a hydraulic prosthesis, he can live his life just as he did before his accident at work. Sensors take as many as 50 measurements per second to determine where and how much force is being applied to the prosthetic. Those measurements are then sent to a micropocessor that then uses a series of algorithms to determine the appropriate movement. That allows Jordan to round up longhorns all day long.