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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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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.