How to improve on infrared night vision technology? Add a soundtrack. Bushnell's 17-ounce Night Vision Monocular with Audio lets you listen in on conversations as far as 270 feet away. The snouted microphone picks up sounds directly in front but ignores noise behind and around you.
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.