A woman holds a cell phone over a QR code made of black and white stones on the sidewalks near the beach in Rio de Janeiro, Brazil, Friday, Jan. 25, 2013. The QR codes are being placed at tourist spots which can be scanned with a mobile device for information about the site. (AP Photo/Silvia Izquierdo)

Associated Press
A woman holds a cell phone over a QR code made of black and white stones on the sidewalks near the beach in Rio de Janeiro, Brazil, Friday, Jan. 25, 2013.  The QR codes are being placed at tourist spots which can be scanned with a mobile device for information about the site. (AP Photo/Silvia Izquierdo)
A woman holds a cell phone over a QR code made of black and white stones on the sidewalks near the beach in Rio de Janeiro, Brazil, Friday, Jan. 25, 2013. The QR codes are being placed at tourist spots which can be scanned with a mobile device for information about the site. (AP Photo/Silvia Izquierdo)
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