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If you could remove all of your skin, it would weigh up to 5 pounds.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
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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.