By the time she was seven, Sarah had witnessed countless murders and numerous horrifying acts of violence ranging from spousal abuse to violent beatings, rape and other atrocities of war and gang violence. You may ask yourself, where could this child have grown up? Was it some war-torn country? Could it have been some country lacking the securities of decent law enforcement where criminals are free to roam and tyrannize innocent citizens? How do children manage to grow up under these circumstances, you ask yourself. But wait, Sarah is your neighbor. Nearly every day you see her and her brothers getting off the bus in the afternoon and running into their house. They aren't a violent family, and they haven't moved from some ravaged country. Sarah is just the average school child whose preferred after-school activity is television viewing. This year she will spend 1500 hours in front of...