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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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People about to have surgery must tell their health care providers about all supplements they take.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.