Dear intrepid lunar explorers: NASA politely asks that, when you travel to the moon, you refrain from messing with the American flag.
Google’s Lunar X Prize promises $20 million to whoever’s first to get a privately funded robot to the moon. But the folks at NASA don’t want any of the stuff they left up there getting messed up in the process, so they've offered a few handy guidelines for what to stay away from while you’re up there. (We’re looking at you, non-autonomous moon robots.)
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.