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The horizontal fraction bar was introduced by the Arabs.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are approximately 3 million unintended pregnancies in the United States each year.