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01:57 Science & Technology NASA & TRAPPIST-1: A Treasure Trove of Planets Found Lesson duration 01:57 7,563,095 Views
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03:04 Science & Technology Why don't we throw trash in volcanoes? Lesson duration 03:04 1,829,836 Views
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03:17 Earth and Space Science Dark matter: How does it explain a star's speed? Lesson duration 03:17 101,833 Views
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