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Did you know?
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 20 feet of blood vessels in each square inch of human skin.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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There are more bacteria in your mouth than there are people in the world.