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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.