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Associated Press
In this April 18, 2012, photo, Carnegie Mellon University professor Howie Choset, right, stands behind a robot as staff researcher Florinan Enner uses a controller to demonstrate how it moves at their lab on campus in Pittsburgh. Scientists and doctors are using the creeping metallic tools to perform surgery on hearts, prostate cancer and other diseased organs. (AP Photo/Keith Srakocic)

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