The man was born without a left hand and had a prosthetic that sensed muscle movements in his forearm stump and moved fingers accordingly. He's been using one made by a 3-D printer that cost $50 to make, and after a year, prefers it over the one that was over 800 times more expensive.
This could be a real boon to orgs like Doctors Without Borders in places like Sudan.
http://3dprint.com/2438/50-prosthetic-3d-printed-hand/