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Why are airplanes slower than they used to be?
Lesson duration 04:59
2,329,837 Views
2,433,890 Views
44,042 Views
4,948,409 Views
146,519 Views
946,487 Views
Why good ideas get trapped in the valley of death— and how to rescue them
Lesson duration 05:10
758,793 Views
994,294 Views
1,022,966 Views
307,759 Views
1,447,040 Views
684,818 Views
What it's like to live on the International Space Station - Cady Coleman
Lesson duration 06:17
77,156 Views
1,319,431 Views
1,219,894 Views
432,250 Views
448,671 Views
What it takes to be racially literate - Priya Vulchi and Winona Guo
Lesson duration 12:23
142,525 Views
3,691,659 Views
413,326 Views
The incredible, bendable, twistable, expandable elephant trunk
Lesson duration 05:10
255,993 Views