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 1217 and the full interview Friday 1218 at 12pm EST.