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How do QR codes work? The checkerboard patterns taking over the world, demystified. Go to https://Saily.com/veritasium and use the code ‘veritasium’ to get a...
A video that explains how information on a QR codes is stored.
I wrote a qr clock to help me learn GWT. Still running, too.
https://broclock.appspot.com/
that is cool.