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There are 20 feet of blood vessels in each square inch of human skin.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.