Shakespeare wrote in his play As You Like It that we humans go through seven ages. The first is the "infant mewling and puking"; next "the whining schoolboy"; then "the lover sighing like a furnace", followed by the soldier "full of strange oaths, seeking the bubble reputation"; then "the justice in fair round belly"; the sixth age is "with spectacles on nose"; and finally there's "second childishness".
Every weekday afternoon, Harvard neurologist Jasmeer Chhatwal gets up from his desk, heads out of the office, and walks about three-quarters of a mile to get a cup of coffee from a neighborhood cafe. There's a perfectly good coffee maker in the office, but the afternoon ritual isn't (just) about caffeine. The 20-minute stroll is helping to stave off symptoms of brain aging like memory loss, according to Chhatwal's research.