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Scientists are developing an entirely new type of prosthetic arm and hand that allows a patient to regain not only movement, but also the sense of touch. American soldiers who have lost limbs in the wars in Afghanistan and Iraq often end up at Walter Reed Hospital in Washington, D.C., for rehabilitation and to get fitted with prosthetics. Dr. Todd Kuiken, of the Rehabilitation Institute of Chicago, works with these patients who provide him with feedback on a bionic arm he developed. Kuiken's work has focused on creating an artificial arm which can respond to the wearer's mind. "What we do is use the nerves that are still left. Although the arm is lost," he says.