kate gray is a paralympian and sports reporter.he lost her hand when she was 2 in a farm accident. she didn't let that stop her but the people at open bionics 3-d printed a hand for her. she just put the hand on and caught something with that hand for its first time. >> yeah! >> activated by must cycles in her arm or does it react to something in its palm? >> they have video of her using one of their test hands and that has a myoelectric sensor. see how it works with just her arm sticking out. she has sensors around it but watch. you could see the hand here on the table, but when she starts moving her arm, like we would move the muscles in our hands. >> just calibrating it to the muscles fired up i guess. >> that's amazing the sensors can pick up the electrical currents of your muscles. >> she's controlling a hand that's like two feet away from her on the table. >> look how mesmerized she is. open bionics do 3-d printing hands for kids. see right here, they have themed hands, the marvel themed ironman hand, the frozen hand and the