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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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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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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.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.