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I loved Susan's metaphor- How if enough people walked on a certain area of grass, a new path will be form.  The brain forms new pathways with different experiences/thoughts/inputs.  The pathway becomes "stronger" with the repetition of these experiences/thoughts/inputs".

While we did not yet discuss how age changes the brain, I am already have many questions.  What steps can a person take to minimize the effects of aging?  If a brain has shrunken due to age, disease , etc.  can it go back to its orginial size with intervention?  Is it true that weight gain can cause the brain to shrink?