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10> It’s The Single Most Important Factor In Ruining Life Happiness:                                                                                                                                                                     If you’ve never heard of the Grant Study, you should know it’s one of the longest-running sociological studies in the world. Starting in 1938, researchers at Harvard tracked the lives of 200 men and reported on their emotional and physical well-being. Over the years, findings have included that intelligence (above a certain level) has no ...