The SuctionSeal vacuum works as well on hardwood and tile floors as it does on carpet. A polycarbonate plate on the front of the upright creates a sealed chamber between the vacuum head and the floor, which makes for more-focused suction. Eureka SuctionSeal Vacuum$150
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.