In case you are interested. Redirecting...
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Sort of like how you steer a shopping cart. Push a little harder on the right side of the handle, a little less on the left, it turns left.
For those who can’t use the FB link, here’s the youtube version.
How Differential Gear Works | QUOTED - YouTube
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Except you don’t steer your car with the differential 
Imperfect analogy, true enough.