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Intelligence - nature or nurture? Researchers find a gene for intelligence and also that a bigger brain matters, yet other recent articles show how motivation affects learning.
 

Immune cells tied to delayed onset of post-stroke dementia

A single stroke doubles a person's risk of developing dementia over the following decade, even when that person's mental ability is initially unaffected. In experiments using both mouse models of stroke and brain-tissue samples from humans, researchers have linked the delayed onset of post-stroke dementia to the persistent presence, in the brain, of specialized immune cells that shouldn't be there at all.
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