When we finished the Brain Fitness Program, sold by Posit Science, the last bit advised us to continue working on our brains. Two of the main suggestions were to learn a foreign language and learn a musical instrument. Note that both activities relate brain work to our hearing. Here is a link to the blog of Tim Ferris featuring a teacher of foreign language to adults and his clues for learning another tongue.
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Bill
Main blog: Fear, Fun and Filoz
Main web site: Kirbyvariety