On this episode I’ve got an interview lined up for you that I did with Bob Froehlich, who hosts the Thinking Clearly radio program and podcast over at KMUD community radio in Redway, California. Our topic was critical thinking and tribalism, very much in the vein of what I’ve been talking about in my recent sketchbook video series titled, appropriately, "Critical Thinking and Tribalism". If you’ve been following my work a certain amount of this will be familiar, but in this interview we covered some new topics relating to tribalism and polarization that I haven’t discussed before; for example, the distinction between ideological polarization and social polarization; evidence that social polarization along political lines has increased dramatically in recent years, especially in the US; and some discussion of the causes of this increase in polarization.