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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.