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Vaccines prevent between 2.5 and 4 million deaths every year.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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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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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.