When we tickle our artistic sides, playing with the varying fields of focus in our camera lenses can be a form of aesthetic expression. But for more practical uses -- say, filming a multi-layered scene like a concert where various subjects are at various depths -- it would be advantageous to capture the entire scene in perfect focus. A researcher in Toronto claims he's created an omni-focus camera that does exactly that.
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.