It’s an aviation story so cool we’re kind of upset we didn’t hear about it a month ago when it happened. Back on August 12th electrical and aerospace engineer Pascal Chretien, working with the backing of French company Solution F, made the world’s first untethered, all-electric manned helicopter flight. And it didn’t even show up on our radars--probably because he only reached an altitude of about one meter.
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.