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06:26 History The rise and fall of the Berlin Wall Lesson duration 06:26 Manage Library 8,890,218 Views
04:28 Environmental Science Will the ocean ever run out of fish? Lesson duration 04:28 Manage Library 1,433,655 Views
06:04 Design, Engineering & Technology How does fracking work? Lesson duration 06:04 Manage Library 2,619,267 Views
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06:27 Social Psychology Why do people join cults? Lesson duration 06:27 Manage Library 5,464,043 Views
04:20 Life Sciences The ferocious predatory dinosaurs of Cretaceous Sahara Lesson duration 04:20 Manage Library 1,945,109 Views
05:31 Engineering Why don't perpetual motion machines ever work? Lesson duration 05:31 Manage Library 16,344,293 Views
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