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85,589 Views
Why are airplanes slower than they used to be?
Lesson duration 04:59
2,329,296 Views
2,432,554 Views
44,031 Views
4,937,848 Views
146,312 Views
945,637 Views
Why good ideas get trapped in the valley of death— and how to rescue them
Lesson duration 05:10
758,619 Views
993,470 Views
1,022,410 Views
307,378 Views
1,445,498 Views
684,300 Views
What it's like to live on the International Space Station - Cady Coleman
Lesson duration 06:17
77,120 Views
1,316,607 Views
1,217,245 Views
432,066 Views
448,349 Views
What it takes to be racially literate - Priya Vulchi and Winona Guo
Lesson duration 12:23
142,427 Views
3,690,206 Views
412,882 Views
The incredible, bendable, twistable, expandable elephant trunk
Lesson duration 05:10
255,884 Views
513,980 Views