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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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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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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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