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We now know this is simply not true. Your brain \u2014 every brain \u2014 is a work in progress. It\xa0is "plastic." By Michael Merzenich, Ph.D. From the day we're born to the day we die, it continuously revises and\xa0remodels, improving or slowly declining, as a function of how we use it. If a brain is\xa0exercised properly, anyone can grow intelligence, at any age, and potentially by a lot. Or\xa0you can just let your brain idle \u2014 and watch it slowly, inexorably, go to seed like a\xa0sedentary body.\n\nMost older brains, by the way, are neglected. They are therefore slower and less accurate,\xa0and do poorer job recording useful information and controlling their owners' actions.\xa0\n\nTune in Wednesday Feb 4 \xa0 At 7PM for the rest of the story.