Here's a cool story about a 17yr old using a 3D printer to create a Brain-Powered Prosthetic Arm. I remember 17 being different...
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When he was 14, Easton LaChappelle built a robotic hand because he thought it would be cool. He made the hand out of Lego bricks, fishing wire, surgical tubing for fingers, and five independently-controlled servos. "
http://blog.makezine.com/2013/02/08/...rosthetic-arm/