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04:18 Life Sciences The physics of human sperm vs. the physics of the sperm whale Lesson duration 04:18 Manage Library 4,371,464 Views
05:58 Science & Technology Light waves, visible and invisible Lesson duration 05:58 Manage Library 1,052,997 Views
04:10 Life Sciences Bird migration, a perilous journey Lesson duration 04:10 Manage Library 256,404 Views
04:08 History Urbanization and the evolution of cities across 10,000 years Lesson duration 04:08 Manage Library 2,657,425 Views
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04:13 History Why do Americans and Canadians celebrate Labor Day? Lesson duration 04:13 Manage Library 591,981 Views
03:45 Earth and Space Science Four ways to understand the Earth's age Lesson duration 03:45 Manage Library 685,902 Views
03:55 Psychology What is déjà vu? What is déjà vu? Lesson duration 03:55 Manage Library 5,003,836 Views
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04:46 Earth and Space Science Gravity and the human body Lesson duration 04:46 Manage Library 446,393 Views
01:55 Linguistics Mysteries of vernacular: Bewilder Lesson duration 01:55 Manage Library 60,203 Views
04:23 Motivation and Emotion Overcoming obstacles Lesson duration 04:23 Manage Library 1,112,761 Views
