But the bar code has become much more than that since it was first used to read the price on a 10-pack of Juicy Fruit gum (67 cents) on the morning of June 26, 1974. Now they are used to board airplanes and track packages. Bar codes help people with diabetes calibrate glucose meters and researchers study the pollination habits of bees. They inspired a hand-held video game, Barcode Battler, in 1991.
