The Parkland Shooting: A Rallying Cry for Students

Tyra Hemans, 19, left, and Logan Locke, 17, right, students who survived the shooting at Stoneman Douglas High School, wait to board buses in Parkland, Fla., Tuesday, Feb. 20, 2018.
( Gerald Herbert / Associated Press )
( Gerald Herbert / Associated Press )
Produced by Oliver Lazarus
Hosted by Todd Zwillich