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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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