A view of the main trench to the permanent camp at Camp Century, Greenland, in the 1950s. The U.S. Army base was abandoned in 1967, after Greenland's ice sheet began shifting and the Army realized that the tunnels wouldn't last.
Pictorial Parade/Archive Photos/Getty Images
Khizr Khan, father of Humayun S. M. Khan, who was killed while serving in Iraq with the U.S. Army, stands on stage with his wife during the Democratic National Convention on July 28 in Philadelphia.
Nicholas Kamm/AFP/Getty Images
Seymour Papert with LEGO Mindstorms robotics kits, which were named in recognition of Papert's seminal book, Mindstorms: Children, Computers, and Powerful Ideas.
Courtesy of SPA Magazine/Courtesy MIT Media Lab