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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.