America’s fleet of flying military robots possess a variety of mission-critical capabilities—their speed and range allow them to quickly cover a lot of ground, and their sensor arrays can pick out ground targets in daylight or darkness—but they can’t do much to locate potential targets hiding indoors. But just try hiding from the Cougar20-H. The highly-sensitive ground-based ‘bot can hear you breathing—through a wall.
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.