Do you beg your teenager to go to sleep earlier so he or she can function in the morning? Well, it turns out they physically can't do that, explains Marvin Wang, a pediatrician at Massachusetts General Hospital, who’s on a mission to make middle and high schools start later in the day.

Also, why adolescent brain development is the culprit behind so much bad (and sometimes law-breaking) decision-making and reckless behavior. And, a sex therapist talks about how Internet porn can sabotage a teenager’s ability to have a normal romantic relationship.