This October will see the publication of Brief Answers to the Big Questions, the final book by Stephen Hawking, as introduced here by Lucy Hawking. The book, which our father was working on at the time of his death, is drawn from his extraordinary personal archive and comprises his final thoughts on the universe’s biggest questions – it has been completed in collaboration with his academic colleagues, his family and the Stephen Hawking Estate, and a percentage of the royalties will go to charity