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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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.
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The human body produces and destroys 15 million blood cells every second.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.