Since Columbine

On April 20, 1999 a school shooting in Littleton, Colo., shook the country. Now, 20 years later, Reporters Nate Minor and Andrea Dukakis look at how one shooting changed America and what we've learned since.

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On April 20, 1999 a school shooting in Littleton, Colo., shook the country. Now, 20 years later, Reporters Nate Minor and Andrea Dukakis look at how one shooting changed America and what we've learned since.

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