You don't have to worry about robots rising up against humanity anytime soon -- the bipedal ones, at least. When they aren't constantly falling down, two-legged robots are running down their power supplies due to inefficient gaits and wasted motion. During a recent DARPA competition, teams from Sandia National Labs and SRI International squared off to see whose robot could walk the furthest. SRI's robot, dubbed the "DURUS," won out by walking 2.05 kilometers in just over two and a half hours while using just 350 watts of power. For those of us who aren't electrical engineers, that's a really impressive feat. In fact, the DURUS uses up to 30 times less power than the ATLAS robot employed in the DARPA challenge.