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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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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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The longest a person has survived after a heart transplant is 24 years.
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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.