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Faith Lennox, 7, right, smiles as she holds an extra plastic prosthetics part with her newly 3-D printed hand at the Build it Workspace in Los Alamitos, Calif., on Tuesday, March 31, 2015. At left, her aunt, Grace Stedman. Build It Workspace is a 3-D printer studio that teaches people to use high-tech printers and provides access to them for projects. Faith's new hand is the result of an emerging technology that is revolutionizing prosthetics, said Build It's Mark Lengsfeld, especially for children like Faith, who quickly outgrow expensive prosthetic limbs and have trouble even using them because of their size and weight. (Photo by Damian Dovarganes/AP Photo)
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