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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).