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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are more bacteria in your mouth than there are people in the world.
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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%