Jeff Bezos, Chairman and CEO of, introduces the Kindle Fire at a news conference, Wednesday, Sept. 28, 2011. Mark Lennihan/AP hide caption

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Manuel Martinez, the manager of a popular salad restaurant in Washington, D.C., called Sweetgreen, assists a customer. Martinez says customers use the QR code on the wall to learn about promotions and to get discounts. Mallory Benedict/NPR hide caption

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