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Science & Technology
Mammoths vs. Mastodons: what's the criteria for de-extinction?
Lesson duration 03:58
467,641 Views
3,200,529 Views
4,833,089 Views
2,450,955 Views
726,309 Views
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Earth and Space Science
Could human civilization spread across the whole galaxy?
Lesson duration 04:34
659,793 Views
628,674 Views
31,861,179 Views
757,975 Views
9,621,592 Views