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03:16 Social Studies The History of Saint Patrick Lesson duration 03:16 Manage Library 1,450,850 Views
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05:21 Literature & Language The controversial origins of the Encyclopedia Lesson duration 05:21 Manage Library 448,075 Views
09:59 How to speak so that people want to listen Lesson duration 09:59 Manage Library 40,581,280 Views
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02:00 Earth and Space Science What outer space does to your body Lesson duration 02:00 Manage Library 348,069 Views
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05:22 Literature & Language How science fiction can help predict the future Lesson duration 05:22 Manage Library 392,960 Views