Guitar Hero's a terrific game, but doesn't do much in the way of teaching. (Unless you want to learn how embarrassingly uncoordinated you can be; in which case, kudos.) Enter a real maestro. Guitar Wizard and the forthcoming Piano Wizard go where few games dare to tread—they claim to make you more knowledgeable. Though initially skeptical, we have to admit, it seems to work. Their spokesperson promised to have web editor Megan Miller playing a song and reading music within 10 minutes. Lo and behold . . .
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.