What function does barcode perform? And where is it used?

What function does barcode perform? And where is it used?

Thundering cannons herald the outbreak of wars and inflaming speeches herald political revolutions but scientific and technological revolutions usually come quietly without any fanfare. Something like that happened in Ohio State’s small-town named Troy having barely 15,500 inhabitants on June 26, 1974. A small boy walked into a provision store to buy … Read more