In all fairness, it's kinder than the regular wear-and-tear my students put on their textbooks. (And we're stuck with those for sixteen years. I started teaching last year, and this is year thirteen. They're being held together by the will of God and book tape now. Possibly also blood sacrifice on the part of the school librarian.) Let's not even get into what they do to the paperback practice workbooks that were also supposed to magically last for sixteen years.