On September 20th in Washington, D.C., Talk of the Nation and National Geographic will team up for a broadcast in front of a live audience. We'll discuss what we know about the teenage brain, and the inherent risks of scientific exploration. Courtesy of National Geographic hide caption

itoggle caption Courtesy of National Geographic

Baghdad's traffic, choked by hundreds of checkpoints, slows to a crawl while security forces inspect vehicles for weapons and explosives. Lynsey Addario/National Geographic hide caption

itoggle caption Lynsey Addario/National Geographic

On Saturday morning, March 5, National Geographic Channel and a team of scientists, engineers & two world-class balloon pilots successfully launched a 16' X 16' house 18' tall with 300 8' colored weather balloons, and set a new world record for the largest balloon cluster flight ever attempted. Stewart Volland /PRNewsFoto/National Geographic Channel hide caption

itoggle caption Stewart Volland /PRNewsFoto/National Geographic Channel