This room, the "anechoic chamber" at Orfield Laboratories, is 99.99 percent sound absorbent, and holds the Guinness World Record for quietest room on the planet. Apparently it's so quiet it drives you insane--the only sounds you hear emanate from your own body, fluids gurgling and heart pumping and joints cracking--and nobody has ever been able to stand it for more than 45 minutes. Read more here.
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.