This is a very extensively linked site to help students with their studies. Each link is rated and has an age category listed. Jean Piaget observed children and proposed many of the theories we use today. This talks about those theories and their implication in schools today. It gives the theory and then an explanation with each theory.
Language development is a complex process.
This outlines some of ways language acquisition can be aided. The ways in which language develops are shown through a narrative in this site. This site talks about these and how they compete in the adolescent. This site discusses the causes, cures, and effects of acne. This offers informative articles on many topics of great interest to teens.