Still cameras have had face detection for three years, and Sony's models are among the best. To bring that capability to video, Sony re-engineered its still-camera image processor for camcorders and wrote updated software that allows it to track faces, even in profile, at a blistering 30 frames per second.
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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.