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Periscope Films uploads a lot of public domain US government material, and has it decently organized. The asbestos series is also interesting, hindsight being 20-20.

See https://m.youtube.com/@PeriscopeFilm/playlists

I like this even more.

AT&T Archives: Similiarities of Wave Behavior

https://m.youtube.com/watch?v=DovunOxlY1k&pp=ygUOYmVsbCBsYWJ...

I've never been a car guy. While I've heard of differentials, I never understood what it was. Thanks to you posting this video, I now understand what a differential does and how it does it.

(I found playing it at 120% speed to be a good balance between comprehension and engagement)

Jam Handy films were amazing. You could show this to an audience who was morally opposed to learning about differentials and they’d still learn about differentials.