Copier Forgotten Document Warning
Around the world, this is probably happening every other minute: Someone takes a xerox of an important document - passport, school test, classified airplane construction plan - and ultimately forgets it in the copying machine.
I guess it would be really easy to create a sensor that can tell whether or not a document is still lying on the copying glass. So the ingenious part is to come up with a clever algo to determine if the document is actually being forgotten, or if the guy at the copying machine is just taking a short break.
Reward: I'd actually like one of those for my home copier - thank you.