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United Counties Science Fair is the regional science fair for the United Counties of Stormont, Dundas and Glengarry (Cornwall area), Ontario, where students present original science, engineering and innovation projects to judges.
Students in Grades 6 to 12 can enter the project exhibition (Grade 6 students compete in the Atom Division and are not eligible to win a trip to the Canada-Wide Science Fair); younger students take part in Science on the Wall. A project has one or two students judged at the higher grade.