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04:12 Design, Engineering & Technology How to fly around the world without fuel Lesson duration 04:12 40,482 Views
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04:33 History Why wasn’t the Bill of Rights originally in the US Constitution? Lesson duration 04:33 985,633 Views
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04:18 Social Studies Why is the US Constitution so hard to amend? Lesson duration 04:18 1,124,881 Views
