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06:25 Earth and Space Science Carl Sagan on the Existence of Extraterrestrials Lesson duration 06:25 658,772 Views
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05:04 Literature & Language What makes something "Kafkaesque"? Lesson duration 05:04 13,289,368 Views
04:12 Design, Engineering & Technology How to fly around the world without fuel Lesson duration 04:12 40,455 Views
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04:33 History Why wasn’t the Bill of Rights originally in the US Constitution? Lesson duration 04:33 985,111 Views
