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 average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Group therapy.
Hydrophilic Group
Share of Hours Worked by Education Level, 1940–2008