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Your heart beats over 36 million times a year.

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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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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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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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