An era-defining book on happiness based on a top 10 most watched TED talk of all time with over 40 million views. 'In a crowded field of life advice and even life advice based on scientific research, Schulz and Waldinger stand apart' Angela Duckworth, author of Grit What makes for a fulfilling and meaningful life? A good life? Based on findings from the 80-year-long Harvard Study of Adult Development, this landmark book reveals the simple yet surprising truth- the stronger our relationships, the more likely we are to live happy, satisfying and overall healthier lives. Revealing the ground-breaking research behind the world's longest study on happiness, programme directors Dr Robert Waldinger and Dr Marc Schulz bring together scientific precision, traditional wisdom, incredible real-life stories and actionable insights to prove once and for all that our own wellbeing and ability to flourish is absolutely within our control. 'An outstanding book. It combines the longest and richest study of human lives anywhere with two remarkable authors of extraordinary breadth' Richard Layard, author of Can We Be Happier? 'This captivating, powerful book shows us scientifically and practically how to define, create and most importantly live the good life' Jay Shetty