A comprehensive and fully updated guide to the biological mysteries that lie behind teenage behaviour.Contrary to popular (parental) opinion, teenagers are not the deliberately lazy, risk-taking and work-avoiding individuals they sometimes appear to be to the adults around them. During the teenage years the brain is undergoing its most radical and fundamental change since the age of two. Nicola Morgan's carefully researched, accessible and empathetic examination of the ups and downs of the teenage brain has chapters dealing with powerful emotions, gender differences, the need for more sleep, the urge to take risks and the reasons behind addiction or depression. The comprehensively updated edition of this classic bestseller contains important new research and a brand-new chapter on social media, making it an essential guide for teenagers and adults alike.