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Updated 14 April 2016

Exercise your brain

As with friendship, neglect and complacency can truly “undo” your brain. Your actual nerves, or grey matter, are mostly determined by your genes at birth. But your white matter – the insulating “telephone wire” that helps transmit information – continues growing until you’re about 45 or 50. What separates people with minds as nimble as kittens from those who process thought like lumbering old Labradors, is the amount of exercise they give their brains. Reading a book every week is the brain’s equivalent of a brisk daily walk

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