Violence spreads like a contagious disease. U.S. adolescents were up to 183% more likely to carry out some acts of violence if a friend had also committed the same act. Contagion extends by up to 4 degrees of separation – from a person to a friend, to the friend’s friend, and 2 more friends beyond.

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Violence spreads like a contagious disease. U.S. adolescents were up to 183% more likely to carry out some acts of violence if a friend had also committed the same act. Contagion extends by up to 4 degrees of separation – from a person to a friend, to the friend’s friend, and 2 more friends beyond.