MacArthur “genius” Catherine Coleman Flowers grew up in Lowndes County, Alabama, a place that’s been called “Bloody Lowndes” because of its violent, racist history. Once the epicenter of the voting rights struggle, today it’s Ground Zero for a new movement that is Flowers’s life’s work. It’s a fight to ensure human dignity through a right most Americans take for granted: basic sanitation. Too many people, especially the rural poor, lack an affordable means of disposing cleanly of the waste from…