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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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.