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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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There are 20 feet of blood vessels in each square inch of human skin.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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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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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.