In the days since the shooting in Parkland, Fla., a group of teenagers has risen to national prominence for their activism and calls for gun control. But more than 3,000 students attend Stoneman Douglas High School. Six of them spoke to a New York Times reporter about the day their childhood ended. Guest: Jack Healy, a national correspondent for The Times. For more information on today’s episode, visit nytimes.com/thedaily.