On February 14, 2018, a gunman opened fire inside Marjory Stoneman Douglas High School in Parkland, Fla., killing 17 people and wounding 17 more. That shooting and the students who survived have reignited a national conversation about guns under the banner "Never Again." On March 24, people across the country will gather for the March for Our Lives to protest gun violence—and to call for changes in firearm policy. Ahead of the nationwide marches we spoke to David Hemenway, director of the Harvard Injury Control Research Center, and one of America’s top firearms researchers. Hemenway discussed why these student-led protests may finally be the tipping point for gun legislation in America. Plus—he explained the public health approach to preventing gun violence and shared the changes to firearms policy that could have the biggest impact on saving lives.