Pollyannas take heart, pessimists take note: Recent studies on achievement and well-being show that optimistic behavior contributes to better physical health, greater resilience in the face of life's twists and turns, and more satisfying relationships. As psychologists Suzanne Segerstrom reveals, optimists lay groundwork for the success they envision. While the rest of us worry whether our goals are attainable, those who practice optimism try to achieve...