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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Your heart beats over 36 million times a year.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.