Google NewsPack of chewing gum becomes first-ever item scanned with a UPC barcode | June 26, 1974 | HISTORY  HistoryChickadees use memory 'bar codes' to find their hidden food stashes  Science News MagazineQuick Response (QR) Code: Definition and How QR Codes Work  InvestopediaHow we almost ended up with a bull's-eye bar code  The ConversationThe Barcode Engineered Its Own Downfall  The AtlanticChickadees Use Brain-Cell 'Barcodes' to Remember Where They Stashed Their Snacks  Scientific AmericanBallots without barcodes pushed by Georgia GOP in election-law blitz aimed at Trump supporters  The Associated PressBar code system reduces long lines at Century Village in Pembroke Pines  WPLG Local 10Scan here: Endowed professor delves into the history of the barcode  Clemson News

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