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05:43 Business & Economics What does it mean to be a refugee? Lesson duration 05:43 Manage Library 1,432,613 Views
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03:49 Physical Science Open letter to the president: Physics education Lesson duration 03:49 Manage Library 1,919,837 Views
02:11 Nature of Science Questions no one knows the answers to Lesson duration 02:11 Manage Library 1,174,691 Views
