We are now engaged not only in a political war, but also in a battle over the very concepts of reason and fact that the Enlightenment brought forth.

Susan Jacoby talks with Bill about the role secularism and intellectual curiosity have played throughout America’s history.

The author and free thinker discusses the rise of ignorance in our classrooms, our culture and our politics.

Bill talks with historian and author Harvey Kaye about Thomas Paine's life and legacy.