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1,420,370 views
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The incredible, bendable, twistable, expandable elephant trunk
lesson duration 05:10
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How one design flaw almost toppled a skyscraper
lesson duration 05:16
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Debunking the myth of the Lost Cause: A lie embedded in American history
lesson duration 04:43
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Why are airplanes slower than they used to be?
lesson duration 04:59
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332,220 views