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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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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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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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