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A scientist is a person who discoveres new. In the text,the scientist shows us how to water. He informs us that water of ponds, canals,rivers is not safe. If we want to drink such kind of water, we have to boil it. People use kerosene, electricity, gas or wood to boil water. The scientist discoveres that the sun rays are enough to boil water. In 1976, AD a scientist taught about this problem. At last, he discoveres that sunrays shines into a mirror it became very hot. The sun rays may be used to boil water. The scientist taught us how to boil water. We get much benefit from discovering something by the scientist.