Penguin Readers is an ELT graded reader series for learners of English as a foreign language. With carefully adapted text, new illustrations and language learning exercises, the print edition also includes instructions to access supporting material online.Titles include popular classics, exciting contemporary fiction, and thought-provoking non-fiction, introducing language learners to bestselling authors and compelling content.The eight levels of Penguin Readers follow the Common European Framework of Reference for language learning (CEFR). Exercises at the back of each Reader help language learners to practise grammar, vocabulary, and key exam skills. Before, during and after-reading questions test readers'' story comprehension and develop vocabulary.Visit the Penguin Readers websitebr>Exclusively with the print edition, readers can unlock online resources including a digital book, audio edition, lesson plans and answer keys.>
Albert Einstein changed the way physicists view the universe - and transformed the way we all see the world. His Theory of Relativity stunned scientists, but it is integral to modern thought as the important scientific discovery of the twentieth century. This volume collects Einstein's own writings on the Theory of Relativity.
Stephen Hawking explains how such great men of science as Copernicus, Galileo, Kepler, Newton and Einstein built on the discoveries of those who came before them, and how these works changed the course of science, ushering astronomy and physics out of the Middle Ages and into the modern world.
