New York is the most photographed city in the world. The Eiffel Tower is the most photographed landmark. And in what may be a sign of the times, the Apple retail store in midtown Manhattan is the 28th-most-photographed place in the world.
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.