04:34 Earth and Space Science Could human civilization spread across the whole galaxy? Lesson duration 04:34 676,588 Views
04:53 Performing Arts The history of African-American social dance Lesson duration 04:53 853,573 Views
04:28 Science & Technology Why are there so many types of apples? Lesson duration 04:28 1,112,092 Views
06:27 Science & Technology The insanely painful sting of the bullet ant Lesson duration 06:27 2,136,925 Views
09:12 Public Health How Americans got stuck with endless drug commercials Lesson duration 09:12 3,222,617 Views
05:11 Medical Conditions Aphasia: The disorder that makes you lose your words Lesson duration 05:11 1,555,874 Views
05:54 Science & Technology Why no aquarium has a great white shark Lesson duration 05:54 32,750,022 Views
