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3,188,372 Views
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304,914 Views
The incredible, bendable, twistable, expandable elephant trunk
Lesson duration 05:10
255,783 Views
992,815 Views
909,185 Views
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How one design flaw almost toppled a skyscraper
Lesson duration 05:16
814,208 Views
1,417,395 Views
Debunking the myth of the Lost Cause: A lie embedded in American history
Lesson duration 04:43
1,865,993 Views
1,326,953 Views