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POPSScientific study shows Einstein, Darwin and Freud werent so rational after all A recent paper, On Universality in Human Correspondence Activity, published in the journal Science by Northwestern University researchers, examined the letter correspondence of 16 famous writers, performers, politicians and scientists, including Einstein, Darwin, Sigmund Freud, Karl Marx, and Ernest Hemingway, and found that the 16 individuals sent letters randomly following a circadian cycle.