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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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There are 60,000 miles of blood vessels in every adult human.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The horizontal fraction bar was introduced by the Arabs.