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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 heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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There are 60,000 miles of blood vessels in every adult human.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.