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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.