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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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The longest a person has survived after a heart transplant is 24 years.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.