Our team at @NYTNational spent many days exploring a disturbing phenomenon: The attack at Columbine High School nearly 20 years ago launched a string of copycats that no one seems to be able to stop. https://nyti.ms/2H3Kahb
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Our team at @NYTNational spent many days exploring a disturbing phenomenon: The attack at Columbine High School nearly 20 years ago launched a string of copycats that no one seems to be able to stop. https://nyti.ms/2H3Kahb
