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columbus discovered america because he asked the king of england to take a journey into the ocean, he had been at see for 63 dats and on the 63rd day he discovered america.
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The potato was first cultivated in south america between three and seven thousand years ago.
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medical practice began to greatly improve improve during the 17th and 18th centuries.
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in the 1600s the dutch attempted to make improvements to the plough. the dutch did it in 1730.
