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Imagination. moe's got it. If as Brin suggests, Glass is available next year then scanning QR codes is one of the brain dead obvious launch apps for it. QR codes will be less variable and more reliable (under arbitrary conditions) than OCR at that point as well as being able to hold more information per square inch. They will be quickly translatable and displayed as human readable information floating in front of your face - with little to no effort required on your part.

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