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Vaccines prevent between 2.5 and 4 million deaths every year.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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The human body produces and destroys 15 million blood cells every second.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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On average, the stomach produces 2 L of hydrochloric acid per day.