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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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There are 60,000 miles of blood vessels in every adult human.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.