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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The average adult has about 21 square feet of skin.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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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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Illicit drug use costs the United States approximately $181 billion every year.