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STEVE EMBER: And this is Steve Ember with the VOA Special English program EXPLORATIONS. Today we tell about one of the world's greatest scientists, Isaac Newton.
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SHIRLEY GRIFFITH: Much of today's science of physics is based on Newton's discovery of the three laws of motion and his theory of gravity.（可濁化） Newton also developed one of the most powerful tools of mathematics.（c你沒發音） It is the method we call calculus.
Late in his life, Newton said of his work: "If I saw further than other men, it was because I stood on the shoulders of giants.
