Plants potted in Aqualok plastic need only a quarter of the water of those in soil. The foamlike material is injected with thousands of small air pockets that, when flooded, hold onto water so it won’t drain out the bottom of the planter. $13
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.