Based on the findings of the 80-year-long Harvard Study of Adult Development, this landmark book uncovers the simple but surprising truth that the stronger our relationships are, the happier and more fulfilled we are, and the healthier we live overall. Uncovering the groundbreaking research behind the world's longest study on well-being, Dr. Robert Waldinger and Dr. Mark Schultz bring together scientific precision, traditional wisdom, incredible real-life stories, and actionable insights to prove that our well-being and ability to thrive are entirely within our control.