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I loves this kind of graphical information. If your more curious, here is a really old video with a really good explanation on differentials:

http://www.youtube.com/watch?v=F40ZBDAG8-o



Do you know of a perhaps new video in our era? thanks though.


I never found one that was better. Most of the 30s-50s instructional videos have a very high degree of efficiency in conveying the information.




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