Sir Isaac Newton was seated in his garden on a summer evening when he saw an apple fall from a tree. He began to think, and, in trying to find out why the apple fell, discovered how the earth, sun, moon and stars are kept on their places.

A boy named James Watt sat quietly by the fireside, watching the lid(壶盖) of the teakettle as it moved up and down. He began to think; he wanted to find out why the steam in the kettle moved the heavy lid.

From that time he went on thinking and thinking; and when he became a man, he improved the steam engine so much that it could, with the greatest ease, do the work of many horses.

Boys, when yohave a difficult lesson to learn, don’t feel discouraged(气馁), and ask someone to help yobefore helping yourselves. Think, and by thinking yowill learn how to think to some purpose.

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