In this April 14, 2015, file photo provided by the California Institute of Technology, Dr. Charles Y. Liu, left, a neurosurgeon at the University of Southern California, laughs with patient Erik Sorto in Pasadena, Calif. Liu led a team of doctors that implanted tiny chips into Sorto's brain in 2013 to allow him to control a robotic arm using his thoughts. It's the latest attempt at creating mind-controlled prosthetics to help disabled people gain more independence. (Lance Hayashida/Caltech via AP) ** FILE **
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