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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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.