Slashdot linked up this article about Kim Peek, the real-life inspiration for the movie Rain Man. Kim is considered a "mega savant", because he has genious capabilities in several academic fields but can't dress himself or find the silverware drawer*. It seems his abilities are actually increasing in his special fields, so scientists are doing a set of MRI scans to see what, if any, changes in his brain may be visible.

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* No, Ellen, Kim is not my long lost brother. I know perfectly well where the silverware drawer is. I think.