URI courtesy @zeynep: "Contagion in Mass Killings and School Shootings" http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0117259 …
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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@zeynep thank youThanks. Twitter will use this to make your timeline better. UndoUndo
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