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Vaccines prevent between 2.5 and 4 million deaths every year.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).