It's too early to know if politicians will heed the calls for increased gun control after the shooting at Marjory Stoneman Douglas High School. But one thing is clear: If change comes, it will be because of the passionate activism of the schools' students. The teens appear to have galvanized a new, national movement and inspired student activists across the country, spurring high school walkouts in Washington D.C., Arizona, and Minnesota.
While this surge of teen organizing around gun control may feel new, the U.S. has a rich history of youth activism. NPR looks at three big moments when children and teens became agents of change: