A camper´s dreams can deflate right along with a punctured mattress. This self-inflating pad has a thin bottom layer of protective polyethylene foam to resist thorns but still roll up small. Therm-a-Rest ToughSkin $120; thermarest.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.