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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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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.