More when more is needed (and less when it isn’t).
Suppose you get interested and want to know a little more about something. Paragraphs in Essential Physics that have more buttons expand to give a curious learner deeper or expanded content, just where they want it and ONLY when they want it. The 880 pages of core content expand to more than 1,200 pages when you include the MORE paragraphs. This richness allows each student to engage with something that catches their fancy.