About 20 workers at the Amazon fulfillment center in this suburb southwest of Minneapolis gathered around a supervisor early one morning before starting another shift. Yelling above all the commotion of a 855,

The robot revolution has long sounded like a far-off sci-fi notion, but it’s a reality at the e-commerce giant.

Amazon is close to having more robots operating inside its warehouses than humans after the e-commerce giant announced this week that it now has more than a million robots working at its facilities around the world.