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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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Thyroid conditions may make getting pregnant impossible.
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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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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
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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.