Chronicles how one of the worst mass shootings in American history lead to the one of the largest youth-led movements in global history.

Not another number / Lauren Hogg and Sam Deitsch -- How it all began: February 14 / Cameron Kasky -- Becoming a team: February 15 and 16 / Sofie Whitney and Brendan Duff -- The rally: February 17 Emma González -- Creating a social Media Movement: mid to late February / John Barnitt, Sarah Chadwick, and Sofie Whitney -- The trip to Tallahassee: February 21 / Jaclyn Corin -- CNN Town Hall: February 21 / Cameron Kasky and Chris Grady -- Our first trip to DC: February 25 / Delaney Tarr -- The first day back at school: February 28 -- Direct political pressure: early March / Charlie Mirsky -- The walkout: March 14 / Naomi Wadler -- The March For Our LIves: March 24 -- A view from the crowd: March 24 / Jammal Lemy -- Mobilizing countrywide and the future of the movement: April and beyond / Matt Deitsch -- How we save lives -- In honor of the victims of the shooting at Marjory Stoneman Douglas.