There are more bacteria in your mouth than there are people in the world.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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The human body produces and destroys 15 million blood cells every second.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.