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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The human body produces and destroys 15 million blood cells every second.