WARNING: The final two seconds of this 4:30 screencast contains a perfectly good word that some might find objectionable. If you are one of the half dozen people that occasionally read this blog, you’ll be fine. As for The Word, every child over the age of ten has heard and (probably) used the word.
Back in 2006 Bert Webb posted tips for marking up your books. https://www.smays.com/2006/02/markup-books/