The long, skinny tube has to go. Tasked with improving the nation's air transportation, NASA wants airplanes to burn 40 percent less fuel than a 777 by 2020 and 70 percent less by 2030. Not only that, it wants those same planes to be whisper-quiet. The best -- and perhaps the only -- way to reach these ambitious benchmarks is to design commercial planes more like stealth bombers and less like pencils.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.