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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The horizontal fraction bar was introduced by the Arabs.
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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.