Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Everyone has one nostril that is larger than the other.
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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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There are 60,000 miles of blood vessels in every adult human.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
The relationship between air temperature and two measures of water vapour saturation of air.