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Design, Engineering & Technology
The World's Roundest Object (and Why it Exists)
lesson duration 11:44
37,154,543 views
31,541,963 views
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23,539,408 views
18,185,645 views
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Earth and Space Science
From outer space to under our skin: a look at the universe
lesson duration 09:01
7,972,588 views
7,527,018 views
7,446,358 views
7,371,567 views
7,132,149 views
7,115,751 views
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6,556,543 views
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