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Vaccines prevent between 2.5 and 4 million deaths every year.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.