via youtube.com
 Great tutorial on how a differential works.  This video is from 1930 and is so great in explaining how it works.   
Take aways for me: 
Video worked even in 1930 - it can work now 
Black and white video seems to give you a different perspective 
Simple examples provide a very clear explanation 
Build on the idea to complete the final example 
Show a practical example of the principle
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