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The horizontal fraction bar was introduced by the Arabs.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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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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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 average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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