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The World's Roundest Object (and Why it Exists)
Lesson duration 11:44
37,361,809 Views
31,838,769 Views
26,176,444 Views
24,045,957 Views
18,617,053 Views
13,903,972 Views
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From outer space to under our skin: a look at the universe
Lesson duration 09:01
8,077,093 Views
8,020,960 Views
7,535,411 Views
7,458,623 Views
7,405,795 Views
7,228,942 Views
7,123,880 Views
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