Important to measure, even more important to grow. It consists of good, even temperament (20%); abundant humor (20%); inclination to see the bright side (20%); health and wellness (20%); and smarts, looks & luck (20%). If that’s true, and it seems as reasonable a formula as any, it’s good news, because most of it is under our own control. Good, even temperament: practice meditation, cultivate perspective. Abundant humor: enjoy the seemingly random if not perverse nature of the universe. Inclination to see the bright side: accept that light and dark emanate from the same source — how we see the world — and we are (almost always) free to choose. Health and wellness: stay active, exercise daily, eat right.