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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are 20 feet of blood vessels in each square inch of human skin.