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04:33 History Why wasn’t the Bill of Rights originally in the US Constitution? Lesson duration 04:33 972,474 Views
10:52 Philosophy Ralph Waldo Emerson and the Beauty of the Everyday Lesson duration 10:52 1,122,278 Views
05:03 Physical Science The otherworldly creatures in the ocean's deepest depths Lesson duration 05:03 2,281,115 Views
06:17 Earth and Space Science Three Ways to Destroy the Universe Lesson duration 06:17 27,688,475 Views
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02:53 Teaching & Education Why we should draw more (and photograph less) Lesson duration 02:53 386,900 Views
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04:18 Social Studies Why is the US Constitution so hard to amend? Lesson duration 04:18 1,112,494 Views
07:21 Design, Engineering & Technology My invention that made peace with lions - Richard Turere Lesson duration 07:21 625,652 Views