It’s always been suspected by research students and now it’s been proven correct. We judge the value, or weightiness, of a book by its physical mass.
Today’s invention is to apply this to all documents which must be taken seriously. The prime example is the card handed to witnesses in court from which to read whatever oath they have chosen (this is currently a bit of laminated paper, if you are lucky).
I would have such oaths printed on a steel plate and make witnesses hold them aloft whilst swearing to tell the truth -thus discouraging perjury.