Talking about arms, do you remember that creepy robot dog? The same engineers are now working on a two legged version, called Petman: Used (at the moment) to test chemical warfare clothing for the US Army, the Petman is able to move at 3.2 mph, recreating the natural heel-toe stride that we employ in our walking motion. Just the question now: what does Petman do when his shoelaces come undone?