The average adult has about 21 square feet of skin.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
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Everyone has one nostril that is larger than the other.