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Where do the world's scientists migrate? Have those patterns changed over the decades? An analysis by Science of the world's largest public repository of scientific CVs brings this population's wanderings into focus. The data come from ORCID, the nonprofit organization that assigns unique identity codes to researchers. It wasn't intended as a massive longitudinal survey of human migration, but with 3 million profiles and growing, ORCID is becoming just that. So far, a quarter of the researchers have added personal information to their public ORCID profiles including the years, locations, and descriptions of their education and employment. The analysis by Science debuts a data set that is shaping up as a vital tool for charting the flow of the world's knowledge producers.