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Science & Technology
The incredible, bendable, twistable, expandable elephant trunk
Lesson duration 05:10
260,257 Views
1,026,674 Views
945,233 Views
1,709,890 Views
Design, Engineering & Technology
How one design flaw almost toppled a skyscraper
Lesson duration 05:16
840,492 Views
1,497,669 Views
Social Studies
Debunking the myth of the Lost Cause: A lie embedded in American history
Lesson duration 04:43
1,982,924 Views
1,352,766 Views
545,305 Views
3,112,472 Views
1,004,045 Views
1,062,516 Views
3,441,912 Views
527,184 Views
Design, Engineering & Technology
Why are airplanes slower than they used to be?
Lesson duration 04:59
2,446,888 Views
328,193 Views