Despite suffering from a neurodegenerative disease that has made it impossible for him to communicate without a voice synthesizer or to move around without a wheelchair, Hawking is one of the world’s top theoretical physicists. While most experts in his field are little known outside the scientific community, Hawking has taken pains to make his work accessible to the layperson and, in so doing, has become a household name. What is the title of his bestselling book on cosmology? Discuss