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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.