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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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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