In 2006, famed film critic Roger Ebert lost the ability to speak after larynx surgery. Today, thanks to computer voice specialists CereProc, he gets it back. The new voice, which he will debut in an appearance on today's Oprah, samples DVD audio commentaries recorded before Ebert lost his voice.
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.