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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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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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There are more sensory neurons in the tongue than in any other part of the body.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.