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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
Vaccines prevent between 2.5 and 4 million deaths every year.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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