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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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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.