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This paper discusses correlations between certain genetic characterestics of the human populations and their aggregate levels of tolerance and happiness. We argue that a major cause of the systematic clustering of genetic characteristics may be climatic conditions linked with relatively high or low levels of parasite. This may lead certain populations to develop gene pools linked with different levels of avoidance of strangers, which helped shape different cultures, both of which eventually helped shape economic development. Still more recently, this combination of distinctive cultural and economic and perhaps genetic factors has led some societies to more readily adopt gender equality and high levels of social tolerance, than others. More tolerant societies tend to be happier because they create a more relaxed environment conducive to happiness.