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06:25 Earth and Space Science Carl Sagan on the Existence of Extraterrestrials Lesson duration 06:25 658,331 Views
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04:12 Design, Engineering & Technology How to fly around the world without fuel Lesson duration 04:12 40,383 Views
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06:17 Earth and Space Science Three Ways to Destroy the Universe Lesson duration 06:17 27,734,679 Views
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04:24 Physical Science How do we separate the seemingly inseparable? Lesson duration 04:24 772,920 Views
