Amazon's one-day delivery service depends on the work of thousands of robots

The sprawling warehouse, which looks big enough to double as an airport hangar, is unofficially known as the "robot highway." Inside Amazon's Denver, Colo., "sortation center," an army of orange robots –– each one about the size of a large suitcase with a small conveyor belt on top –– glides across the concrete floor, picking up and then delivering packages to one of hundreds of chutes that organize each item by Zip code before they're shipped to customers. Though largely unknown to the outside world, the robots, known as Pegasus, have already logged more than 1.5 million miles of driving, according to an Amazon blog post describing work inside the warehouse. Amazon unveiled Pegasus during the keynote session at its first-ever re:MARS conference in Las Vegas this week, devoted to, in Amazon's words, "Machine Learning, Automation, Robotics, and Space." It was there that Amazon revealed that the company already has 200,000 robots working at dozens of distribution facilities around the world.