There are lots of way to learn first-hand the principles of flight, but most of them require years of studying or a pilot’s license. There is, however, an exception: folding paper airplanes. Da Vinci did it, as did the Wright Brothers and Jack Northrop, and if it’s good enough for them, it’s good enough for us.
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.