Last December, Amazon gave the public a rare look into the cutting-edge tech that helps it handle the constant deluge of online orders: its robots. The world’s largest online retailer has said it has tens of thousands of warehouse bots working across 10 of its US warehouses, or fulfillment centers. While the company is relying on more than 100,000 temp workers this holiday season to supplement its already massive warehouse workforce, the advantages of offloading more of that work onto machines are easy to see. Robots don’t slow. They don’t tire. They don’t get injured or distracted or sick. They don’t require paychecks or try to unionize.