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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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There are 60,000 miles of blood vessels in every adult human.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.