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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.