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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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 prevent between 2.5 and 4 million deaths every year.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.