What man brought us the theories of gravity and the basic laws of motion?

When an ordinary man sees an apple fall from a tree, he picks it up and eats it. When Isaac Newton does, he comes up with the theory of gravity. Newton's great mind was challenged by the fields of mathematics, physics, and astronomy, which led him to theories in optics and planetary motion. His 'Philosophiae Naturalis Principia Mathematica' is said to be the foundation of modern physics.

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