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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.