It’s the mystery of mysteries — especially to parents. Now experts are exploring the recesses of the brain and finding new explanations for why adolescents behave the way they do. FRONTLINE explores how the new discoveries can change the way we parent, teach, or perhaps even understand, our teenagers.

It's the mystery of mysteries - especially to parents. Now experts are exploring the recesses of the brain and finding new explanations for why adolescents behave the way they do. FRONTLINE explores how the new discoveries can change the way we parent, teach, or perhaps even understand, our teenagers.

New research in neuroscience has demonstrated that a crucial part of the brain undergoes extensive changes during puberty - precisely the time when the raging hormones often blamed for teen behavior begin to wreak havoc. Through interviews with scientists, teachers, parents and young adults, FRONTLINE investigates whether another cause of adolescent angst is all in their heads - or more precisely, in their still-forming brains.