mass shootings

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School shooters usually show these signs of distress before they open fire

Two years before he lined his schoolmates up against a classroom wall and executed them one by one, the student, who would become the gunman, tried to show his English teacher something important. He had quietly slid up his sleeves to reveal the cut marks running down his arms. The teacher panicked. A novice educator [...]

Mass Shootings Are Contagious

NBC News Mass shootings spawn subsequent mass shootings, new research finds. The researchers discovered statistical "clusters" of shootings in which four or more people die, the standard definition of a mass shooting. School shootings also cluster, said study researcher Sherry Towers, a professor of mathematical and computational modeling at Arizona State University. "On [...]