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Vaccines prevent between 2.5 and 4 million deaths every year.
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The horizontal fraction bar was introduced by the Arabs.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.