TRACY, CA - JANUARY 20: Boxes move along a conveyor belt at an Amazon fulfillment center on January 20, 2015 in Tracy, California. Amazon officially opened its new 1.2 million square foot fulfillment center in Tracy, California that employs more than 1,500 full time workers as well as 3,000 Kiva robots that can fetch merchandise for workers and are capable of lifting up to 750 pounds. Amazon is currently using 15,000 of the robots spread over 10 fulfillment centers across the country. (Photo by Justin Sullivan/Getty Images)
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Getty Images News Justin Sullivan