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Did you know?
If you could remove all of your skin, it would weigh up to 5 pounds.
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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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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.