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Did you know?
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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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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There are more sensory neurons in the tongue than in any other part of the body.
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The average adult has about 21 square feet of skin.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.