What is an atheist? What is an agnostic? Peter Boghossian (author and philosophy instructor) joins Dave Rubin to talk about the difference between atheism and agnosticism. This is part of a longer interview about critical thinking, atheism and religion, politics, and more. Stay tuned for more clips from Dave's interview with Peter Boghossian coming tomorrow 12/17 and the full interview Friday 12/18 at 12pm EST.