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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Your heart beats over 36 million times a year.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.