To avoid shadowy webcam chats, the LifeCam brightens your face on the fly. It tweaks brightness and exposure—or even slows down the frame rate to capture more light—to make sure you’re more than a silhouette. $50
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.