Mass killings, school shootings are contagious

http://feeds.sciencedaily.com/~r/sciencedaily/~3/aitnncypXoI/150702151520.htm

A team of researchers examined databases on past high-profile mass killings and school shootings in the US and fit a contagion model to the data to determine that these tragedies create a period of contagion lasting an average of 13 days, that roughly 20 to 30 percent of such occurrences arise from contagion and that the incidence of these events is significantly higher in states with a high prevalence of gun ownership.

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