When your visitors admire a photo on this eight-inch digital picture frame, give them a copy on the spot. The first model with a built-in printer creates 4x6 images using compact cartridges that include both paper and ink. SmartParts SP8PRT $280; smartpartsproducts.com
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.