It's easy to forget that person in your life who abandoned all electronics and moved into the woods to prepare for the Mayan apocalypse. He doesn't have a phone or a Facebook account, and he isn't listed in any directory. But that doesn't mean you can't show your weirdo paranoid friend that you care. We've listed a few ideas here. (But maybe don't, like, surprise him with these. He is probably against surprises.)
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.