In January 2011, Oregon State University ichthyologist Brian Sidlauskas led a research expedition into the little-known Cuyuni River region of Guyana in South America. His team documented more than 5,000 fish, but Guyana’s immigration policies required them to identify and catalog every specimen they wanted to bring back—a nearly impossible task, especially on a tight schedule. Sidlauskas uploaded his research photos to Facebook and tagged members of the scientific community who were able to identify almost all of the photos in under 24 hours.

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