Football and the military have a lot in common: they both rely on strategy, training, and, maybe especially, technology. The comparisons are so apt we couldn't help but compile a list of some instances when military technology crossed paths with organized football (modern or old-school). Not all of these inventions started with the military, but it's fair to say that without the military advancing them, football wouldn't have put them into use. Who knows? Maybe we'll be seeing drones on every field in a few years' time.
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.