Have you read the cov­er sto­ry of the New Sci­en­tist this week: Men­tal mus­cle: six ways to boost your brain? The arti­cle, which includes good infor­ma­tion on brain food, the val­ue of med­i­ta­tion, etc., starts by say­ing that: “Brain train­ing does­n’t work, but there are lots of oth­er ways to give your grey mat­ter a…