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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.