Flag Day, Sewer Water Recycling, Multiracial Identity

What makes America’s stars and stripes so special? Plus, sewer water is key to solving the shortage of drinking water in El Paso, Texas. Then, after people get one of those DNA ancestry tests, they’re more likely to call themselves “multiracial," and that worries researchers who study race and discrimination. Additionally, on today's show: domestic abuse starts with little acts of isolation called “coercive control,” dogs help scientists understand the secret lives of box turtles, and indigenous practices can improve Native American health.