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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.