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Demolition, disease, and death: Building the Panama Canal
lesson duration 05:36
951,262 views
1,648,928 views
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Why are airplanes slower than they used to be?
lesson duration 04:59
2,312,741 views
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Why good ideas get trapped in the valley of death— and how to rescue them
lesson duration 05:10
751,235 views
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295,839 views
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662,104 views
What it's like to live on the International Space Station - Cady Coleman
lesson duration 06:17
76,025 views
1,261,231 views
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