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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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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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Approximately 25% of all reported medication errors result from some kind of name confusion.
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The horizontal fraction bar was introduced by the Arabs.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.