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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are 60,000 miles of blood vessels in every adult human.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.