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Your heart beats over 36 million times a year.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are 20 feet of blood vessels in each square inch of human skin.
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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.