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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.