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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.