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Thyroid conditions may make getting pregnant impossible.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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.