Book Darts! I’m typically reading for research and writing and the book darts are great for coming back to the right sentence when I’ve stopped off. I’ll leave them in long-term if I’m swapping between edited volumes—I’ve got a tin of 100, so it’s no problem if I leave a few within books here and there. I typically add one to the first page whenever a new book comes home. If I haven’t got one already placed or I start reading while out and about I dog-ear.