You don’t need big speakers to get big sound from your television. Emo Labs’s Edge Motion pumps tones out of a vibrating plastic sheet, just two hundredths of an inch thick, that sits over a TV screen. Its wide surface produces louder and more realistic sound than the small speakers in most TVs, but it takes up a lot less room than a separate stereo system.
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.