British supermarket Ocado is using robots to make online grocery shopping faster. They call it “the hive,” or “the grid.” Or sometimes just: “the machine.” It’s a huge structure that fills a warehouse on the outskirts of Andover, a small and quiet town in southeast England. There are more than a thousand of robots, each the size and shape of a washing machine, and they wheel about, night and day, moving groceries. Their job is to be cheaper and more efficient than humans, and they are very good at it.