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04:33 Environmental Science How smart are orangutans? Lesson duration 04:33 Manage Library 3,689,982 Views
10:09 Global Economics Why can't we just print money to pay off debt? Lesson duration 10:09 Manage Library 4,181,951 Views
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04:23 Earth and Space Science How do animals see in the dark? Lesson duration 04:23 Manage Library 1,254,229 Views
04:32 Health Our natural sleep cycle is nothing like what we do now Lesson duration 04:32 Manage Library 594,909 Views
04:09 Environmental Science Are spotty fruits and vegetables safe to eat? Lesson duration 04:09 Manage Library 789,383 Views
04:07 Life Sciences What is the biggest single-celled organism? Lesson duration 04:07 Manage Library 786,160 Views
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12:21 Psychology How to stay calm when you know you'll be stressed Lesson duration 12:21 Manage Library 17,736,919 Views