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

Amazon's expanding fleet of robots includes: Hercules, a lifter capable of handling 1,250 pounds; Pegasus, which sorts packages on conveyor belts; and Proteus, the company's first fully autonomous robot able to operate directly alongside people.

Technology is catching up to the U.S. workforce very quickly and one company is leading the way with robotics — which isn't exactly good news on the jobs front. The Wall Street Journal did a deep dive into Amazon's quest to automate tasks that have been done by its employees for decades.