A few years back, Dr. Mona Hanna-Attisha felt perfectly comfortable telling parents it was fine for their kids to drink the town’s water. Flint, Michigan was a part of America, wasn’t it? She joins us to tell the story of how she evolved from passive pediatrician to investigator of the city’s water supply and activist for the public’s health. Her new book is called “What the Eyes Don’t See: A Story of Crisis, Resistance, and Hope in an American City” (One World).