"One of the ways to be happy, to be truly happy, is to contribute to a cause that is greater than yourself. And, through Harvard-based research, we can see that happy people live longer."

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I interviewed 100 happy people - I call them my Happy 100 - and I learned amazing ideas and techniques from them that I began integrating into my life. I put them into practice - and they worked! I went from a D+ in happiness to an A-.

— Marci Shimoff