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Environmental Science
Why I must speak out about climate change - James Hansen
Lesson duration 17:52
57,540 Views
Business & Economics
Why good ideas get trapped in the valley of death— and how to rescue them
Lesson duration 05:10
758,591 Views
509,450 Views
301,100 Views
3,190,097 Views
Science & Technology
Climate change will displace millions. Here's how we prepare - Colette Pichon Battle
Lesson duration 12:48
136,359 Views
1,913,478 Views
700,504 Views
1,696,368 Views
945,486 Views
3,205,972 Views
392,960 Views
1,678,776 Views
4,853,066 Views
1,503,993 Views
307,299 Views
3,137,398 Views
1,561,608 Views
305,026 Views
Science & Technology
The incredible, bendable, twistable, expandable elephant trunk
Lesson duration 05:10
255,861 Views
993,354 Views
909,787 Views