A Kiva robot drive unit is seen, foreground, before it moves under a stack of merchandise pods, seen on a tour of one of Amazon's newest distribution centers in Tracy, Calif., Sunday, Nov. 30, 2014. This Amazon Fulfillment Center opened in 2013 and was refitted to use new robot technology in the summer of 2014. All year Amazon has been investing in ways to make shipping faster and easier to prepare for this holiday season. At this Northern California warehouse the company is employing robotics and other new technology to help workers process the annual onslaught of shopping orders. (AP Photo/Brandon Bailey)
{}