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1,430,578 views
296,744 views
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300,467 views
Science & Technology
The incredible, bendable, twistable, expandable elephant trunk
lesson duration 05:10
253,166 views
963,857 views
879,489 views
1,569,553 views
Design, Engineering & Technology
How one design flaw almost toppled a skyscraper
lesson duration 05:16
796,530 views
1,375,493 views
Social Studies
Debunking the myth of the Lost Cause: A lie embedded in American history
lesson duration 04:43
1,821,235 views
1,317,583 views
520,522 views
2,848,854 views
972,280 views
980,573 views
3,361,901 views
513,772 views
Design, Engineering & Technology
Why are airplanes slower than they used to be?
lesson duration 04:59
2,313,023 views
306,944 views
332,949 views