New scientific discoveries have put a much different perspective on our understanding of adolescent behavior. Research now suggests that the human brain is still maturing during the adolescent years, with significant changes continuing into the early 20s. The developing brain of the teenage years may help explain why adolescents and young adults sometimes make decisions that seem to be quite risky and may lead to safety or health concerns (Spear, 2002). And it may add insights into unique vulnerabilities and opportunities associated with youth.