. The Right Dose of Exer­cise for the Aging Brain (New York Times): “A small amount of exer­cise may improve our abil­i­ty to think as we age, but more may not be bet­ter, accord­ing to a new study of exer­cise and cognition… In gen­er­al, the researchers found, most of the exer­cis­ers showed improve­ment in their think­ing…