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Vaccines prevent between 2.5 and 4 million deaths every year.
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Everyone has one nostril that is larger than the other.
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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.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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Blood is approximately twice as thick as water because of the cells and other components found in it.