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04:34 Earth and Space Science Could human civilization spread across the whole galaxy? Lesson duration 04:34 676,697 Views
04:53 Performing Arts The history of African-American social dance Lesson duration 04:53 854,245 Views
04:28 Science & Technology Why are there so many types of apples? Lesson duration 04:28 1,112,324 Views
06:27 Science & Technology The insanely painful sting of the bullet ant Lesson duration 06:27 2,136,998 Views
09:12 Public Health How Americans got stuck with endless drug commercials Lesson duration 09:12 3,222,814 Views
05:11 Medical Conditions Aphasia: The disorder that makes you lose your words Lesson duration 05:11 1,557,352 Views
