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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.