The Modular Prosthetic Limb, developed by researchers at Johns Hopkins University, includes 100 sensors, 26 joints, 17 motors and a tiny computer and is controlled by the brain. By thinking about a movement, amputee Johnny Matheney triggers electrical impulses in his residual limb that cause the prosthetic arm and hand to respond. "You don't even really think about it," he said. "You're extending the arm, talking and doing other things -- it just automatically does it."

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