From your morning coffee order, to weaving through passengers on the train, sitting through tense work meetings, riding in a packed elevator, attending a happy hour with colleagues, or relaxing on the couch with family, every day is filled with social interactions that nurture and support your brain's health. Whether mundane or extraordinary, they collectively make up the 'social diet' that you feed your brain, that influences your well-being, shapes your experience, and, done right, even len...