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Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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