What makes a life fulfilling and meaningful? The simple but surprising answer is: relationships. The stronger our relationships, the more likely we are to live happy, satisfying, and overall healthier lives. In fact, the Harvard Study of Adult Development reveals that the strength of our connections with others can predict the health of both our bodies and our brains as we go through life. The invaluable insights in this book emerge from the revealing personal stories of hundreds of participants in the Harvard Study as they were followed year after year for their entire adult lives, and this wisdom is bolstered by research findings from this and many other studies. Relationships in all their forms--friendships, romantic partnerships, families, coworkers, tennis partners, book club members, Bible study groups--all contribute to a happier, healthier life.