This document contains summaries of several topics related to adolescence: 1. It divides adolescence into three stages - early (ages 11-14), middle (ages 15-17) and late (ages 18-21) and discusses the key developmental tasks of this period. 2. It notes that addictions in adolescence are a major public health problem and that different substances pose varying but extremely dangerous risks and damages. 3. It lists some basic rights of adolescents such as the right to know their parents, have a home, education and food.