Photo: David Malan/Getty ImagesHow many people do you know? You’ve probably never counted. Tyler McCormick has worked it out: around 600. Or more precisely 611, according to estimates by McCormick, a professor in the statistics and sociology departments at the University of Washington. That’s a national average, but McCormick can actually compute an estimate for you, or anyone.

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Persons: David Malan, Tyler McCormick, McCormick, That’s Organizations: University of Washington