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Thyroid conditions may make getting pregnant impossible.
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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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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Excessive alcohol use costs the country approximately $235 billion every year.