Is your printer spying on you for the government? If you have a color laser printer then the odds are you have a printer that is marking every page you print with it's serial number. It seems that as print quality increases more and more people are looking at printers as a license to print money, literally.
Each printed page has the serial number of the printer coded in little yellow dots. "In every printout. The millimeter-sized dots appear about every inch on a page, nestled within the printed words and margins."
Want to know if your printer is doing this? Simply take a powerful blue light source, like a blue LED keychain light, and a magnifying glass to a printed page. This might be a way to cut down on corporate espionage as well.