When Joe Biden became president he wanted to bring Americans together, to forge unity. But maybe unity isn't what we should aim for. Our guest this week says instead of focusing on that elusive goal, Americans need to concentrate on what's damaging all of us: toxic polarization.

In this episode we look at what toxic polarization is and how to end it, person by person.

Peter Coleman has advised the Biden administration on how to detoxify America. He is a mediator and psychologist who specializes in conflict resolution. A professor of psychology and education at Columbia University, he is the author of the forthcoming book, The Way Out: How to Overcome Toxic Polarization.