Before watching this video, I really couldn’t have told you what a differential gear was. I certainly couldn’t have explained how one works.
But this clever video starts with an example that is easy for anyone to understand and slowly builds one example on the next until finally you truly get how the complicated gear works.
As a newspaper editor I would tell reporters to write so their mom could follow the story. I think this video does an amazing job pulling off that feat with a subject that could easily overwhelm the casual viewer.