It wouldn't be right to go this week without a photographic look at the Olympics, so we've got this awesome fencing image, a shot of the competitor-tracking cameras, and the unlit Olympic flame. But there's also a lot more, including a 3-D supernova and a deadly typhoon in China. Check out the gallery to see them all.
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.