How can we keep our minds sharp?

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What reallyhappens when our minds and brains journey together down the wrong path? When we find ourselves depressed or stressed? And what can we do to make sure our minds remain sharp long into old age?

Lynda Shaw, a cognitive neuroscientist and author of the book

Your Brain is Boss

,explained to Stephen Cole what goes on in our brains when we're under pressure – andhow we can get through it.