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 ...

To marvel at the choice and convenience of modern shopping, go visit your grocery-store mustard aisle. My local Whole Foods sells more than 20 different kinds: basic yellow mustard and Grey Poupon, ...