Amazon's robot army grows by 50 percent

Amazon.com hires a lot of people. But the expansion of its army of orange-wheeled robots is more than keeping pace. The world's largest e-commerce retailer said it has 45,000 robots in some 20 fulfillment centers. That's a bigger headcount than that of the armed forces of the Netherlands, a NATO member, according to World Bank data. It's also a cool 50 percent increase from last year's holiday season, when the company had some 30,000 robots working alongside 230,000 humans.