Most of us have ears that work OK most of the time—there’s the occasional ear infection or very bad cold, but that is a passing thing, at least generally. So what’s best to hear as you go about your daily life? • Quiet nature soundtracks do work out the best, for what goes on in our heads and our bodies—so the best sorts of things to hear are gently rustling leaves and grasses, peacefully singing birds, and burbling water. It’s…