How Differential Gear works (BEST Tutorial)

In case you're interested, here are two of the best video's I've seen describing how a watch works ( [LINK] ) and how a differential works ( [VIDEO] ) Don't let their old school-ness throw you off. They are both extremely well done and demonstrate in clear and simple language from first principles to finished object.

Fantastic!! High-quality educational videos like this are hard to come by. Here's another retro tutorial that really stands out in my memory (differential gears): [VIDEO]

Neat site. My father was a mechanic and thus I should know all of this stuff, but I wasted away my life behind the keyboard instead :D I often find videos do a much better job at explaining some concepts. For example, the section on differentials: [LINK] After reading this I feel none the wiser. Whereas after watching this ancient Chevrolet training video from the 1930's I feel like I completely understand how diffs work: [VIDEO]

I've never understood why these old instructional films so often seem much better at getting things across and making them stick in my mind than more modern material. A couple other examples. 1. A 1959 film from Bell Labs on wave behavior that made standing wave, reflections, energy loss due to impedance mismatch, and impedance matching much clearer than anything else I've seen: [1]. 2. A 1937 explanation of how the differential in a car works: [2]. Here is another upload of that which is lower resolution, but has more from the same source in the sidebar [3]. I suppose it could be something akin to survivorship bias that makes old educational films seem so good--the bad ones don't get remembered 60 years later. [1] [LINK] [2] [VIDEO] [3] [LINK]

These old-school education videos are such a treat. One of my favorite is on differential gearing - [VIDEO] (apologies about the clickbait title)