“Author Ben Tarnoff discusses Mark Twain, Bret Harte, and other literary notables who lived in San Francisco in the mid-19th century, and how the western frontier experience influenced a new way of writing. Twain and his fellow literati make up Tarnoff’s new book ‘The Bohemians: Mark Twain and the San Francisco Writers Who Reinvented American Literature.’ He sits down with Piya Chattopadhyay.”