Rachel Cohen is the author of “A Chance Meeting: Intertwined Lives of American Writers and Artists, 1854 - 1967.” She tells Steve Paulson that Ulysses S. Grant owed his publishing success to Mark Twain; that Henry James worried about his clothes because an English novelist told him little British boys had fewer buttons; and Willa Cather gave up magazine work at the urging of Sarah Orne Jewett. And much more!