http://ed.ted.com/featured/zt8LPHB1 What keeps us happy and healthy as we go through life? As the director of 75- year-old study on adult development, Waldinger has unprecedented access to data on true happiness and satisfaction. In this talk, he shares three important lessons learned from the study as well as some practical, old-as-the-hills wisdom on how to build a fulfilling, long life. 1. Why do long-term studies like this typically not work? 2. Briefly describe the three big lessons about relationships that the study has offered.