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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Illicit drug use costs the United States approximately $181 billion every year.
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The horizontal fraction bar was introduced by the Arabs.