Given Nintendo's fondness for officially reissuing classic games on updated formats, they won't like DDRGame beating them to the punch with its own portable NES player. It does fulfill a real need, however. But so does software emulation that already lets Nintendo games run on portables such as laptops and iPhones (with equally dubious legality). And the emulating gadgets also hold hundreds of games without requiring an oversized carry-on. ($50, ddrgame.com)
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.