Send us Fan Mail In our post-truth era, perhaps it’s not surprising that a growing number of people say they believe, despite all evidence to the contrary, that the Earth is flat. Mark struggled to understand how anyone can believe this, so he asked Joe to get inside the head of a flat-earther and explain how someone might come to that way of thinking. Joe and Mark discuss the modern history of the Flat Earth movement, the three things that appear to motivate such beliefs, and how it helps to...