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For years I've investigated the value of positive emotions - those pleasing yet fleeting moments of joy, serenity, gratitude, amusement, and the like. In controlled laboratory experiments, I've measured the effects of these states on people's thinking styles. In field studies, I've cataloged their effects on people's skills, traits, and well-being. What I've learned is that positive emotions carry far more benefits than most of us suspected.

I've encapsulate two classes of these benefits into m