President Obama fist-bumps Nathan Copeland

President Barack Obama fist-bumps the robotic arm of Nathan Copeland during a tour at the White House Frontiers Conference at the University of Pittsburgh in Pittsburgh, Pa., Oct. 13, 2016. For the first time ever in humans a technology that allowed Copeland to experience the sensation of touch through a robotic arm that he controls with his brain. (Official White House Photo by Pete Souza)

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