Since the late 1930’s researchers at Harvard have been studying two sets of men: those who were college students at Harvard and those from an economically disadvantaged neighborhood in Boston who had little in common with the students except age. Since their adolescence, these two groups have been studied to help determine whether there are factors in life that correlate with happier, healthier, longer lives. The study is still ongoing. Its current director, Robert Waldinger, recently gave a TED talk during which he described the surprising findings that researchers have uncovered as they look back on the lives of these now old men. Curious about the research outcomes? Watch This.