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Why are airplanes slower than they used to be?
Lesson duration 04:59
2,329,684 Views
2,433,661 Views
44,041 Views
4,945,885 Views
146,476 Views
946,244 Views
Why good ideas get trapped in the valley of death— and how to rescue them
Lesson duration 05:10
758,762 Views
994,015 Views
1,022,850 Views
307,662 Views
1,446,635 Views
684,707 Views
What it's like to live on the International Space Station - Cady Coleman
Lesson duration 06:17
77,144 Views
1,318,678 Views
1,218,982 Views
432,180 Views
448,605 Views
What it takes to be racially literate - Priya Vulchi and Winona Guo
Lesson duration 12:23
142,511 Views
3,691,279 Views
413,233 Views
The incredible, bendable, twistable, expandable elephant trunk
Lesson duration 05:10
255,959 Views