Roger Angel, an astronomer at the University of Arizona, stands in front of his new project: a solar tracker. Angel wants to use the device to harness Arizona's abundant sunlight and turn it into usable energy. Jason Millstein for NPR hide caption

itoggle caption Jason Millstein for NPR

Adam Steltzner, the leader of the rover's entry, descent and landing engineering team, cheers after Curiosity touched down safely on Mars on Sunday. Bill Ingalls/NASA/Getty Images hide caption

itoggle caption Bill Ingalls/NASA/Getty Images

NASA engineer Adam Steltzner led the team that designed a crazy new approach to landing on Mars. Rachael Porter for NPR hide caption

itoggle caption Rachael Porter for NPR

Joe Palca serves up some hot tea on a very hot day at Teaism in Washington, D.C., last week. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR
Benjamin Arthur for NPR

Scott O'Neill wants to rid the world of dengue fever by infecting mosquitoes with bacteria so they can't carry the virus that causes the disease. Benjamin Arthur for NPR hide caption

itoggle caption Benjamin Arthur for NPR