Throughout American history, hucksters have tried to pull a fast one on unsuspecting marks. Kevin Young joins us to talk about how everyone from P.T. Barnum to Edgar Allan Poe helped bring on our post-truth society. His new book is called “Bunk: The Rise of Hoaxes, Humbug, Plagiarists, Phonies, Post-Facts, and Fake News” (Graywolf Press).