| Associated Press/Silvia Izquierdo - A two-dimensional bar code, or QR code, as they're known, made from black and white stones covers a sidewalk near the beach in Rio de Janeiro, Brazil, Friday, Jan. 25, 2013. …more The QR codes are being placed at ... See all stories on this topic » |  Yahoo! News (blog) |
via Google Alerts - qr code
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