If your a genius theoretical physicist you might understand most of this book. If you could not understand half of it like me you might still wish to listen and enjoy it. The science and math explanations were completely over my head. However listening to them was important. It made me realize how brilliant this man was in a time when computers were not in existent. This is a biography of one of the greatest individuals in history. Not just a mega genius but an approachable funny likeable man whose theories have changed and are still changing the world. Listen to this book!