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Nate:

The researchers examined extensive letter correspondence records 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 but in cycles.

The same mathematical model the Northwestern team used in a previous study to explain e-mail behavior now has been shown to apply to the letter writers. This refutes the rational model, which says that people are driven foremost by responding to others.

No matter what their profession, all the letter writers behaved the same way. They adhered to a circadian cycle; they tended to write a number of letters at one sitting, which is more efficient; and when they wrote had more to do with chance and circumstances than a rational approach of writing the most important letter first.