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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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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Thyroid conditions may make getting pregnant impossible.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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.