15 points
Does PDF actually allow some objects to be invisible on screen but visible on print? Because that’d be cool.
It’s 2225. Archaeologists discover yet another long forgotten university library storage facility. Inside, they find stacks of Elsevier journals that have never been opened. They then find puzzling coffee stains that somehow appear to be result of the printing process, and conclude that the cultural significance of these markings was probably lost to the ages.
