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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.