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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 term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
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People about to have surgery must tell their health care providers about all supplements they take.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.