Gamers are tough to shop for. You can bet they've already got the big ticket items, and you don't want to end up buying a first-person shooter for the person who only enjoys artsy games (or vice versa). Luckily, there are at least a few items that show thoughtfulness and that the person will actually use. Some are good gifts for the gaming friend whose habits you know, while others are safe bets for gift-givers who aren't sure where to start.
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.