SpaceX is developing a vertical takeoff and landing prototype named Grasshopper. The intent is use these as booster rockets that returns to the launch pad after separation rather than burning up in the atmosphere, or falling into the ocean. The latest video shows the unmanned rocket lifting off, going up about 325m then returning to the launch pad. And if that wasn't cool enough, all the footage was taken by a remotely controlled hex-copter. [Image from SpaceX video]