School bullies have been around as long as there have been schools. Studies reveal several reasons why some children become bullies. Research shows that a certain combination of size and personality may be one factor. Bigger, more aggressive children are more likely to try to dominate their smaller, quieter peers. Another factor linked to bullying is overexposure to violent TV programs. By the time the average American child is ten years old, he or she has watched thousands of acts of violence, including assault and murder. Such exposure can lead to aggression and violence. Finally, exposure to real violence is a factor in bullying. Studies indicate that victims of bullies often turn into bullies themselves. Whether abused by family members or tormented by other kids, bullies typically learn their behavior from others. Look closely into the eyes of a bully, and you may be looking into the eyes of a former victim.