1937 film explains how a car differential works
HN discussion of the video from 2017: <a href="https://news.ycombinator.com/item?id=15122031" rel="nofollow">https://news.ycombinator.com/item?id=15122031</a><p>This video has been posted 20+ times, over the years!<p><a href="https://hn.algolia.com/?q=yYAw79386WI" rel="nofollow">https://hn.algolia.com/?q=yYAw79386WI</a>