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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.