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Did you know?
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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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.