Move over, Amazon drones, this is just as fun. Google has purchased Boston Dynamics, an engineering company that develops animal-like machines, including a "cheetah" that's the world’s fastest-running robot, the company confirmed Sunday. Boston Dynamics once supplied the robots to the U.S. military, and does not sell the products commercially. The company is run by former Android boss Andy Rubin, and the terms of the sale have not been disclosed. Aside from the cheetahs, Boston Dynamics also created robots such as the BigDog and WildCat.