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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).