"QR Codes are barcodes of information that hardlink the physical world with the online world. They are considered a form of simple augmented reality. ... I think we should just take cell phones out and have them on our desk at all times. When it is time for the test, they put their cell phones in a box on the teacher's desk and get them back afterwards. Let's harness the elephant in the room instead of pretending he isn't there. Cell phones and mp3 players provide us valuable links to the pockets and minds of the students we teach and qr codes are a great tool to leverage that connection."