WASHINGTON, DC - JUNE 17: The first completely artificial heart implanted into a human being, the Liotta-Cooley heart, is displayed before a hearing of the House Administration Committee in the Longworth House Office Building on Capitol Hill June 17, 2015 in Washington, DC. Part of the Smithsonian collection, the artificial heart was developed by Dr. Domingo Liotta and implanted by Dr. Denton A. Cooley on April 4, 1969 and supported a 47-year-old patient for nearly three days until a donor heart was found. (Photo by Chip Somodevilla/Getty Images)