This Teacher Designed The Sleeve, A Device To Lock Out School Shooters
Daniel Nietzel, an elementary school teacher in Iowa, dreamed up a contraption designed to seal a classroom from the inside.
Since Sandy Hook, there have been 74 school shootings in the United States. And even if there are some heated claims from extreme gun-rights activists about what, exactly, constitutes a school shooting, the idea has become a very real fear that today's teachers have to reckon with.
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