About to chuck that busted CD? Not so fast, young grasshopper. Web editor Megan Miller demonstrates three ways to resurrect those scratched discs using stuff you probably already have sitting on your shelf.
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.