Back in November, South Korea announced that a project to create robot prison guards was underway. And just as predicted, the robo-guards are ready for their first tests. Check out video (complete with prisoner/robot interaction) after the jump.
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.