Evolutionary psychologists SMU Associate Professor of Psychology Norman Li and Dr Satoshi Kanazawa of the London School of Economics published last month in the British Journal of Psychology on the implications of fascinating new research. Digging into the question of what makes a life well lived, they use what they call "the savanna theory of happiness" to explain two main findings from an analysis of a large national survey (15,000 respondents) of adults aged 18 to 28.