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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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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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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.