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03:39 Civics The historical audacity of the Louisiana Purchase Lesson duration 03:39 Manage Library 696,039 Views
03:35 Technology How did trains standardize time in the United States? Lesson duration 03:35 Manage Library 224,824 Views
03:52 Physical Science How polarity makes water behave strangely Lesson duration 03:52 Manage Library 1,048,198 Views
03:56 Life Sciences What if we could look inside human brains? Lesson duration 03:56 Manage Library 216,346 Views
04:52 Earth and Space Science Life of an astronaut Lesson duration 04:52 Manage Library 698,420 Views
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