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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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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.