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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Approximately 500,000 babies are born each year in the United States to teenage mothers.