There are many reasons why a librarian discards books. Some haven't been checked out in decades, others split and lose chunks of pages when you open them, and then there are the ones have illustrations of spiral-permed teenagers wearing cropped football jerseys and acid washed jean jackets on the cover who complain about their hippy parents not understanding them.
Letting go of books can be one of the hardest chores a librarian undertakes. We are in this business because we love the books, but I've learned that not all books have equal value in my library. Discarding books is especially difficult in a school setting where there are many adults and teenagers willing to give plenty of input on the decision-making process.
Despite these obstacles, I persist in weeding my library garden. Today, I deselected 53 novels, some of which haven't been touched in decades. The best part about weeding is giving the goods away. It makes my day when a teenager comes up to me with a sci-fi novel that hasn't been checked out since 1972 and says "Can I really have this one?"