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He was a rich citizen of Abdera, in Thrace, and a student of Leucippus, another Greek philosopher. He studied natural philosophy in Thrace, Athens and Abdera. He liked to study geometry and he travelled to many places, including Egypt, Babylon and India. He wrote many books
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Sir Isaac Newton was an English physicist, mathematician and astronomer. He is well known for his work on the laws of motion, optics, gravity, and calculus. In 1687, Newton published a book called the Philosophiæ Naturalis Principia Mathematica in which he presents his theory of universal gravitation and three laws of motion.
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Dalton's Atomic theory is a scientific theory about atoms. Dalton made the theory to explain why the elements would combine in certain ways. The idea of atoms was already known at the time, but not widely accepted. Dalton's theory of atoms was based on actual observation. Before this, ideas about atoms were based more on philosophy.
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Albert Einstein was a German-born scientist. He worked on theoretical physics. He developed the theory of relativity. . His famous equation is E=mc^(E = energy, m = mass, c = speed of light).
