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Is violence contagious?
Is violence contagious?

Baltimore police say they can't explain the recent uptick in homicides in the city's Northeast District, which has seen more murders than any other part of the city so far this year. The killings seem disturbingly random, ranging from domestic disputes and arguments among neighbors to drug- and gang-related violence. Last month, for example, a man killed his neighbor and a bystander during an argument over a parking space. Several murders appear to have been the result of gang disputes. And for some of the killings police can cite no motive at all. The murders are seemingly unrelated, yet they resemble what in another context we would see as a pattern: Individual acts of violence...