Good arti­cle in the Wash­ing­ton Post today: Is It Real­ly Smart to Teach Old Brains New Tricks? The reporter presents a good overview of what is happening, but framed around a high­ly arti­fi­cial choice for con­sumers: either you a) do phys­i­cal exer­cise, or b) take part in social inter­ac­tions, or c) engage in men­tal exercise. What about switch­ing…