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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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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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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.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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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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