One of Obama's last posts while in office showed him fist-bumping a robotic arm. It's actually a prosthetic robotic arm belonging to Nathan Copeland, who can control it with his mind and sense touch with it.
White House photograper Pete Souza captured the moment at the White House Frontiers Conference at the University of Pittsburgh last October.
From the DARPA site:
When DARPA launched the Revolutionizing Prosthetics program in 2006, the state of upper-limb prosthetic technology was far behind lower-limb technology. Advancing upper-limb technology was judged to be a more difficult medical and engineering challenge. After six years of development, the Revolutionizing Prosthetics program developed two anthropomorphic advanced modular prototype prosthetic arm systems, including sockets, which offer increased range of motion, dexterity and control options. Thirty-five volunteer amputees participated in a Department of Veterans Affairs (VA) funded optimization study in VA and DoD medical centers and provided design feedback for the development of the Gen-3 Arm System by DEKA Integrated Solutions Corporation, one of two primary performers on the Revolutionizing Prosthetics program. Based on that testing and subsequent refinement, DEKA submitted a 510(k) premarket notification to the FDA in April 2012 seeking approval to make the Arm System commercially available.