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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.