More than 7,000 new books are released every day — but most of those writers won’t make a living off their work. Author Michael Castleman joins host Krys Boyd to discuss three distinct eras of book publishing, from the first printing press to Amazon, and why today it’s fairly easy to find yourself in print — but much harder to find an audience to read it. His book is “The Untold Story of Books: A Writer’s History of Publishing.”