A health department pickup truck sprays insecticide against mosquitoes in a San Juan, Puerto Rico, neighborhood in January. Alvin Baez/Reuters hide caption

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 hide caption

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 hide caption

The 19-year-old rapper Desiigner, whose song "Panda" is one of the year's biggest hits, on stage at the Barclays Center in Brooklyn in July. Nicholas Hunt/Getty Images hide caption

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 hide caption

Director Mark Osborne's take on The Little Prince features the voices of Jeff Bridges, Rachel McAdams and Paul Rudd. Netflix hide caption