In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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There are 20 feet of blood vessels in each square inch of human skin.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee.
Schools are a primary agent of socialization. One of their functions is to teach children the ...
Primary rainbows are the brightest and most common.