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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.