This week's Book Shambles is a cross over event. Physicist, and one of the world's biggest selling science authors, Carlo Rovelli has a new book out today, Helgoland. He joined Robin for a conversation for our Patreon exclusive series Tips for Existence but we're making some of that conversation around the book available for free here on Book Shambles. To hear the full Tips for Existence episode, which is 40 minutes longer, you can sign up at patreon.com/bookshambles Other guests in that series include Neil Gaiman, Tim Minchin, Ann Druyan and Brian Greene.