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950,250 views
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Design, Engineering & Technology
Why are airplanes slower than they used to be?
lesson duration 04:59
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Business & Economics
Why good ideas get trapped in the valley of death— and how to rescue them
lesson duration 05:10
742,704 views
11,143,725 views
503,270 views
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Design, Engineering & Technology
How do jetpacks work? And why don't we all have them?
lesson duration 05:03
273,750 views