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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.