In the 1930s American car makers made a series of educational videos explaining a variety of different car related topics, like a how a transmission works, differential steering, suspension, oil lubrication and much more.
Delivered in a no-nonsense attitude with no rush, no drama, no entertainment fluff and on the point explanations those videos are for many unmatched in their greatness and accessibility compared to modern educational stuff. They are delivering their message easily understandable with no hassle in a kind of manner which seems to be a lost art noawadays, it's a blast from the past showing how great education can be if done right.