I just looked up why we have margins.... (https://doyouremember.com/135250/why-notebooks-have-margins) "Any papers lying around could become snacks for rodents, and naturally, they started on the loose edges where they could easily bite and tear off some paper. Their feast would take important notes with them. To resolve this, notebooks came to include red margin lines. These marked where a person should stop writing in case their notes became a snack." WEIRD!!!!