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Did you know?

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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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

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The average adult has about 21 square feet of skin.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho
Frederick Law Olmsted and Calvert Vaux, Central Park, New York City. Frederick Law Olmsted and Calvert Vaux, Central Park, New York City.
Energy Use by Different Country Groups Energy Use by Different Country Groups
GDP per Capita by Country Group, 1820–2008 GDP per Capita by Country Group, 1820–2008
The population of a city has continued to grow since 1950. The population of a city has continued to grow since 1950.
Video: Component of feedback systems & Communication and regulation of body systems

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