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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. Newton also developed one of the most powerful tools of mathematics. 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. "

Isaac Newton showed that a prism of glass can separate white light into a spectrum of colors.

STEVE EMBER: One of those giants was the great Italian scientist, Galileo. Galileo died the same year Newton was born. Another of the giants was the Polish scientist Nicholas Copernicus. He lived a hundred years before Newton.

Copernicus had begun a scientific revolution. It led to a completely new understanding of how the universe worked. Galileo continued and expanded the work of Copernicus.

Isaac Newton built on the ideas of these two scientists and others. He found and proved the answers for which they searched.

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SHIRLEY GRIFFITH: Isaac Newton was born in Woolsthorpe, England, on December twenty-fifth, sixteen forty-two.

He was born early. He was a small baby and very weak. No one expected him to survive. But he surprised everyone. He had one of the most powerful minds in history. And he lived until he was eighty-four.

Newton's father died before he was born. His mother married again a few years later. She left Isaac with his grandmother.

The boy was not a good student. Yet he liked to make things, such as kites and clocks and simple machines.

STEVE EMBER: Newton also enjoyed finding new ways to answer questions or solve problems. As a boy, for example, he decided to find a way to measure the speed of the wind.

On a windy day, he measured how far he could jump with the wind at his back. Then he measured how far he could jump with the wind in his face. From the difference between the two jumps, he made his own measure of the strength of the wind. Strangely, Newton became a much better student after a boy kicked him in the stomach.

The boy was one of the best students in the school. Newton decided to get even by getting higher marks than the boy who kicked him. In a short time, Newton became the top student at the school.

SHIRLEY GRIFFITH: Newton left school to help on the family farm.

It soon became clear, however, that the boy was not a good farmer. He spent his time solving mathematical problems, instead of taking care of the crops. He spent hours visiting a bookstore in town, instead of selling his vegetables in the market.

An uncle decided that Newton would do better as a student than as a farmer. So he helped the young man enter Cambridge University to study mathematics.

Newton completed his university studies five years later, in sixteen sixty-five. He was twenty-two years old.

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