The Canada-Wide Science Fair (CWSF) is an annual science fair in Canada coordinated by Youth Science Canada. Started in 1962, it is the highest level of competition in Canada, and approximately 400 projects and 500 students are judged at the fair. Finalists must qualify from approximately 25,000 competitors at over 100 regional science fairs (or, in the province of Quebec, the provincial science fair) throughout Canada.

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