Four years ago, engineer Tony Nijhuis was visiting an aviation museum in Duxford, England, when he spotted his next project: the iconic World War II–era Boeing B-29 Superfortress. Nijhuis has been building electric models since he was a boy, but he had been thinking about doing something bigger. Much bigger. The result is a replica that— with a 20-foot wingspan, period decals, and loudspeakers that blare sounds of the real engine—boasts nearly everything but the bombs.
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.