More people have died or been injured in mass school shootings in the United States in the past 18 years than in the entire 20th century. In a new study, researchers have reviewed the history of mass school shootings in the U.S.

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More people have died or been injured in mass school shootings in the United States in the past 18 years than in the entire 20th century. In a new study, researchers have reviewed the history of mass school shootings in the U.S.