The first modern barcode was scanned 50 years ago this summer—on a 10-pack of chewing gum in a grocery store in Troy, Ohio. Fifty is ancient for most technologies, but barcodes are still going strong.
If the checkout scanner malfunctions when you’re picking up a last-minute gift on your way to a birthday party, all hope is not lost—the cashier can complete the transaction by entering the number ...
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