Crash Course videos by John Green.
Anatomy: https://thecrashcourse.com/courses/anatomy
Astronomy: https://thecrashcourse.com/courses/astronomy
Biology: https://thecrashcourse.com/courses/biology
Chemistry: https://thecrashcourse.com/courses/chemistry
Crash Course videos- Science-related:
History of Science: https://thecrashcourse.com/courses/historyofscience