(Business Insider) In June 2009, The Atlantic published a cover story on the Grant Study, one of the longest-running longitudinal studies of human development.

The project, which began in 1938, has followed 268 Harvard undergraduate men for 75 years, measuring an astonishing range of psychological, anthropological, and physical traits—from personality type to IQ to drinking habits to family relationships to “hanging length of his scrotum”—in an effort to determine what factors contribute most strongly to human flourishing.

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