Tomorrow marks the anniversary of the shooting at Marjory Stoneman Douglas High School that left 17 people dead. Some of the survivors — Emma Gonzales, David Hogg, Cameron Kasky and others — have turned their mourning into action, marking a changing wind for gun laws around the nation.

We spoke with David Cullen, author of Parkland: Birth of a Movement and Columbine, who spent time getting to know the students and families affected by the Parkland shooting.

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