During the Cold War, a U.S. military installation called Camp Century was carved out of the ice sheet in Greenland. One of the camp’s projects was drilling a near mile-long ice core, which in the subsequent decades went missing. We are joined by Paul Bierman, a geologist and professor at the University of Vermont, who will tell us about the secretive base, where the missing ice core was found and the staggering discovery he found at the bottom of the core.