Establishing the laws of universal gravity and the fundamental laws of motion, Newton's momentous 1687 essay stands as one of the most important works in physics, and it revolutionized the way scientists investigate and prove their theories. In Principia, Newton used mathematical terms to present the principles of time, force, and motion, which have been instrumental in the development of modern physics. In his introduction, the famed physicist and bestselling author Stephen Hawking shows how his work built on that of his predecessors, Nicolaus Copernicus and Johannes Kepler.

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Sir Isaac NewtonStephen Hawking's ability to make science understandable and compelling to a lay audience was established with the publication of his first book, A Brief History of Time, which has sold nearly 10 million copies in 40 languages. Hawking has authored or participated in the creation of numerous other popular science books, including On the Shoulders of Giants and The Illustrated On the Shoulders of Giants.

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Better World Books (https://www.BetterWorldBooks.com) is a for-profit, socially conscious business and a global online bookseller that collects and sells new and used books online, matching each purchase with a book donation. Each sale generates funds for literacy and education initiatives in the U.S., the UK, and around the world. Since its launch in 2003, Better World Books has raised $33 million for libraries and literacy, donated over 32 million books, and reused or recycled more than 397 million books.

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