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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Everyone has one nostril that is larger than the other.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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.