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I’ve found there have been several stages in my life: youth, when I had no idea what I was doing; marriage, when I had no idea what I was doing; several careers, when I had no idea what I was doing; and raising a family, when — well, you get the picture.

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Does it feel like some people are just born happy? That’s because they are. But after hundreds of scientific studies on happiness, we now know that at least 40 percent of our happiness is in our own control. What’s more, it can be boosted by a few key habits.