The security system is actually a PC, connected to a barcode scanner. What the workers have to do is that they scan their work pass onto the bar code scanner and the results will be displayed on the ...

I break down how barcodes work and the information they reveal about products. Map shows US drinking water contaminated with forever chemicals Danica Patrick dusts off her election firesuit and sends ...

Barcodes work based on light reflected back to scanner optics: black does not reflect light, while the white (blank) spaces do reflect light. Because characters (alphabetic, numeric, special) are ...