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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.