A recently-concluded DARPA program sought to extinguish fires using unusual methods. No water or simple common chemicals for DARPA: instead, this is "a novel flame-suppression system based on destabilization of flame plasma with electromagnetic fields and acoustics techniques." Below, you will find a video of somebody rubbing a fire with some sort of rod, which puts the fire out.
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.