How to build a commercially viable flying car: first, make it a motorcycle. The idea of creating a personal transportation craft that can both take to the skies and travel along the ground has been alive as long as science fiction. But meeting both the FAA's regulations for aircraft while simultaneously meeting the National Highway Transportation Safety Administration's guidelines for automobiles means compromises on both sides.
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.