Data mining by online merchants isn't just so Overstock.com can offer to sell you the same product you just purchased on Amazon. It has the power to make all our lives better! Orbitz, which makes online reservations for hotels and such, figured out that Mac and Windows users have different purchasing habits--and adjusted accordingly.
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.