Twenty years after Columbine, what’s changed and what hasn’t
Today marks 20 years since the Columbine High School shooting near Denver, Colorado, where two students killed 12 classmates and a teacher before turning their guns on themselves. As members of the community gathered Saturday for a day of remembrance, Dave Cullen, who wrote a book about the massacre, joined Hari Sreenivasan to talk about what’s changed, and what hasn’t, since Columbine.
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