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Multiple educational institutions from the primary to the college level contribute videos of lectures and lessons about the most common academic fields - and maybe a few not-so-common ones as well.

Free online documentary films (curated from YouTube).

TheKidShouldSeeThis is a Tumblr blog that picks a few high-quality videos focusing on subjects like science, nature, art, music, technology, and storytelling.  The videos are included from sites like YouTube, Vimeo and more.

British Pathe is one of the oldest media companies in the world, so the strength (and depth) of their collection is not surprising. All professional usages require a license fee, but the video clips can be previewed online. They have a full-fledged channel on YouTube where a small collection is hosted. 

Open University's series of short videos explaining concepts from a variety of subject areas.