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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Your heart beats over 36 million times a year.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.