Aggression in school-age children may be triggered when kids are 3 years old and younger and witness violence between their mothers and their partners. These kids tend to be more aggressive than other children their age.

Social worker Megan Holmes thinks it’s more a case of experience. She says, “People may think children that young are passive and unaware, but they pay attention to what’s happening around them." According the National Center for Children Exposed to Violence, between 3 and 10 million children witness some form of domestic violence every year.
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Take a breathalyzer test to find out why you’re fat–Take a spit test to find out why you’re violent.

A new study indicates that a simple saliva test could be an effective tool in predicting violent behavior such as bullying, since there’s a link between salivary concentrations of certain hormones and aggression. And new evidence demonstrates a link between video games and youth violence and delinquency.
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Researchers have studied the links between media violence and violent behavior for years without coming to a definite conclusion about this.

Correlating crime data and film release schedules between 1995 and 2004, researchers found that on weekends when violent films were in theaters, the number of assaults in the US increased by about 1,000. In the February 17th edition of the Los Angeles Times, Rebecca Keegan quotes the researchers as saying, "The results emphasize that media exposure affects behavior not only via content, but also because it changes the time spent in alternative activities."
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