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Stephen Hawking is one of the world's leading theoretical physicists. (A physicist studies the relationship between matter and energy in space and time.) Hawking has written many science books for non-scientists. His most famous book is called "A Brief History of Time." It has sold over 9 million copies.

Hawking is a professor of mathematics at the University of Cambridge. And he holds a position that Isaac Newton once held. Hawking has been successful in his work, even though...