TRACY — In Amazon’s million-square-foot order-filling warehouse, two low-slung orange robots carrying stacks of consumer products are zipping across the floor, headed right at each other. One stops — not on a dime, it turns out, but rather over a QR code stuck to the floor — and allows the other to proceed, carrying inventory to a human worker who will pluck out an item, scan it and send it off for packing and shipping.
In this building the size of 28 football fields, containing four miles of conveyor belts and 15 million items awaiting customer orders from Northern California […]
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