After trying out the bionic hand via a rig that fitted a working bionic hand parallel to his real one, Milo volunteered for the surgery. His new hand will be able to grasp and pinch in response to signals picked up by two sensors placed over the skin near nerves in the forearm, using nerve stimuli that would’ve caused similar movements in his biological hand. (via Patient Elects to Have Hand Amputated to Make Way for a Bionic One | Popular Science)