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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.