Columbine: 20 Years Later

Violent Lineage

Media contagion and Columbine.

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Evolving Arsenals

A look at the changing weaponry of school shooters.

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Law & Disorder

Tracking more than a quarter century of high-profile school shootings and the legislative efforts to curb the violence.

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Lockdown Nation

Across the country, students are regularly practicing active shooter drills. But are the exercises making kids safer? And at what cost?

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In Memoriam

We Are All Columbine.

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