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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are 60,000 miles of blood vessels in every adult human.
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There are more bacteria in your mouth than there are people in the world.
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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.