Check out this awesome "Bionic" arm, a prosthetic limb that Claudia Mitchell controls with her mind. Mitchell's arm is "myoelectric," picking up electrical signals from her brain. "Electrodes help the signals jump from her body, to the prosthesis, which uses a computer to figure out which motion Mitchell is thinking about." The arm cost 3 million dollars to develop. Here's an article on it: http://on.io9.com/w3O30H The video gets going about 45 seconds in. Skip ahead if you don't want to hear the intro. Amazing stuff :-)
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