Elementary schools across the U.S., like this one in Connecticut, practice active shooter drills, where students are told to barricade the door and grab any object they can find in the classroom to protect themselves. Watch the full documentary, 'Generation Columbine,' on the STARZ app now. | NowThis

Former school librarian Yvonne Cech recalls this heartbreaking moment from the day she heard gunshots at Sandy Hook Elementary School. Watch the full documentary, 'Generation Columbine,' on the STARZ app now. | NowThis

More than two decades after the shooting at Columbine, an entire generation has grown up under the threat of gun violence. This new NowThis documentary examines the epidemic of school shootings and their lasting impact through the eyes of survivors. 'Generation Columbine' is available now on STARZ. | NowThis

These women who both survived mass shootings found hope at The Rebels Project, an org founded by Columbine survivors — and now they’re helping other survivors work through their trauma | NowThis