QR codes are showing up in some unusual places these days, embedded in everything from wedding invitations to dioramas on the subway. You can even place a laser-engraved QR code on a cemetery headstone, so that visitors can scan the code on their smartphones to learn more about a deceased person.
One of the first users of QR (Quick Response) codes was a Japanese subsidiary of Toyota that used the codes in 1994 to track motor vehicles during the manufacturing process. QR codes have become especially popular in advertising, where they're used to lure consumers to websites, which in turn allows those companies to learn more about shoppers.
What it sees is what you get:
So when do we get our very own code buried beneath our skin?