Day 257~366

The universal product code (UPC) is the official name for the pattern of black lines on the side of almost everything you can possibly purchase. Simply put, the bar code. What makes the bar code interesting is that the lines as well as the 12-digit code have meaning. The white spaces between the black lines are also meaningful. The bars are for machines to “read,” the numbers for us unsophisticated humans. We’ll get to the bars in a bit. The first six numbers are related to the manufacturer and the type of transaction, the next five describe the product or…