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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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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.