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04:32 Design, Engineering & Technology Is it possible to create a perfect vacuum? Lesson duration 04:32 Manage Library 1,086,261 Views
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05:31 Engineering Why don't perpetual motion machines ever work? Lesson duration 05:31 Manage Library 16,321,574 Views
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05:06 Earth and Space Science 3 Planets That Shouldn't Exist Lesson duration 05:06 Manage Library 1,038,444 Views
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02:57 Physical Science What's the ultimate campfire fuel? Lesson duration 02:57 Manage Library 270,522 Views