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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 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.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.