Dave's Killer Bread is getting attention at retail — and not just because of its name. All those who walk down the bread aisle at any PCC Natural Markets store can find out more about the organic, whole-grain bread by using their smart phone to take a picture of a shelf tag. That's because the shelf tag features a quick-response code, a two-dimensional (2D) barcode that wirelessly connects cell phone users to websites, photos, videos and other content. In Dave's case, the QR code provides ...

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