Can a campus that values free speech, opposing points of view and vigorous debate simultaneously provide a safe environment for each of its members?  Are the values of tolerance and safety necessarily in conflict with the value of hearing a wide spectrum of opinions?  My guest is John Palfrey, Head of Phillips Academy in Andover, Massachusetts and author of Safe Spaces, Brave Spaces: Diversity and Free Expression in Education.  We discuss the challenge of cultivating healthy argumentation on campuses, the influence of social media, and how he navigates these concerns with a diverse high school student body.