"Someone watching him climb wouldn’t know he had a prosthesis based on his gait, Hargrove said, though they may hear the motor whirring." That's incredible. We

"Someone watching him climb wouldn’t know he had a prosthesis based on his gait, Hargrove said, though they may hear the motor whirring." That's incredible. We may not have flying cars, but this is quite a step in the right direction.