Scannable codes used to be found only at grocery store checkouts, but thanks to the proliferation of smartphones, they are now everywhere. How have they changed over the years?

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Licenses for the images used in this video:
https://gnu.org/licenses/fdl.html
https://creativecommons.org/licenses/by/3.0/legalcode
https://creativecommons.org/licenses/by-sa/2.5/legalcode

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