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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.