Well, when I was a kid in the 80’s, almost all of my textbooks had been recycled from the year before, and all of them had been drawn in, scribbled over, ripped

Well, when I was a kid in the 80’s, almost all of my textbooks had been recycled from the year before, and all of them had been drawn in, scribbled over, ripped up, had jelly stains on them - the school district replaced them every maybe five years or so, so every once in a while, I’d get a clean one, but usually I’d get something that was useless in places. On the other hand, my kids are learning from PDF’s now, and once the lesson is over, they delete the PDF’s, so they have nothing to reference - and even if they were saving them, it’d be a challenge to try to organize them in any meaningful way.