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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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Blood is approximately twice as thick as water because of the cells and other components found in it.