Stephen Hawking was a very famous scientist whose ideas changed the world. He studied space and time and taught people about the universe. Stephen was often very ill and his life was not easy, but it was extraordinary. Penguin Readers is a series for learners of English as a foreign language. Beautifully illustrated and carefully adapted, the series introduces language learners around the world to the bestselling authors and most compelling content from Penguin Random House, and includes language activities that help readers to develop key skills. Penguin UK is part of the world's leading trade publisher.