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Vaccines prevent between 2.5 and 4 million deaths every year.
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One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.