How Effective Are School Lockdown Drills?
Since the 1999 Columbine High School shooting, a generation of American children have learned not just how to hide from a potential shooter. But there's little data on what kinds of drills work best.
Đọc tiếp trên NPR
At April 20, 2019 at 01:08AM
Categoty Education
Thứ Bảy, 20 tháng 4, 2019
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