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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The horizontal fraction bar was introduced by the Arabs.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.