This document discusses challenges faced by teens and strategies for libraries to positively interact with them. It covers three main challenges teens face: biological development including puberty and nutrition issues; cognitive development as their brains are still developing critical thinking skills; and social/emotional development as they form identities and relationships. The document provides tips for libraries, such as listening to teens, avoiding stereotypes, and being flexible. It emphasizes handling nuisance behaviors calmly and following behavior policies, while not taking misbehavior personally since teens' brains are still developing.