Let Scooba loose, and it will not only vacuum but also squirt, scrub, squeegee, and suck your floor drya first for household robots. By condensing the device's components, iRobot kept the bot to the size of a 3.5-inch-high dinner plate. $400
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.