Twenty years ago, two teenagers murdered a dozen students and one teacher at Columbine High School in Colorado.For this special broadcast, we looked at Columbine's legacy. Leigh Paterson of KUNC Public Media and Guns & America shared her reporting, which includes conversations with Columbine survivors, school administrators and activists. Want to support 1A? Give to your local public radio station and subscribe to this podcast. Have questions? Find us on Twitter @1A.