This is TELL ME MORE from NPR News. I'm Celeste Headlee, Michel Martin is away. Coming up, we talk with actor Ziyi Zhang about her latest film "The Grandmaster," and women in kung fu. That's in a moment. But we start our program today in Florida. At least 20 children who were on the radar of child protective services have died there since April, that's according to an investigation by the Miami Herald. And the question of course is, why and how do we stop more deaths from occurring?