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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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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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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

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Video: Optic Nerve and Optic Disk Animation (Part 2 of 2)

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