05:21 Linguistics Are Elvish, Klingon, Dothraki and Na’vi real languages? Lesson duration 05:21 2,918,538 Views
04:18 Life Sciences The physics of human sperm vs. the physics of the sperm whale Lesson duration 04:18 4,372,365 Views
10:16 Earth and Space Science Questioning the universe - Stephen Hawking Lesson duration 10:16 86,061 Views
15:24 Science & Technology Natural pest control ... using bugs! - Shimon Steinberg Lesson duration 15:24 17,563 Views
15:28 Social Studies America's native prisoners of war - Aaron Huey Lesson duration 15:28 124,314 Views
04:08 History Urbanization and the evolution of cities across 10,000 years Lesson duration 04:08 2,685,097 Views
12:23 Design, Engineering & Technology The game layer on top of the world - Seth Priebatsch Lesson duration 12:23 17,719 Views
12:45 The Arts The true power of the performing arts - Ben Cameron Lesson duration 12:45 24,264 Views
10:48 Motivation and Emotion The surprising truth about what motivates us Lesson duration 10:48 19,825,567 Views
04:13 History Why do Americans and Canadians celebrate Labor Day? Lesson duration 04:13 595,274 Views