As psychologists wrestled with these ideas, however, and as biologists worked out the first sketch of the human genome, a more sophisticated understanding of nature and nurture began to emerge. Yes, genes explain far more about us than anyone had realized, but the genes themselves often turn out to be sensitive to environmental conditions.32 And yes, each person has a characteristic level of happiness, but it now looks as though it’s not so much a set point as a potential range or probability distribution. Whether you operate on the high or the low side of your potential range is determined by
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