When you were milling corn back in the centuries, you used two big round stones. The upper stone had to rotate so the corn could be mashed and come out as flour. But this method was complicated in that time. How do you make the stone rotate and get the corn between the stones, and make flour out of it? The answer was: you have to make grooves in the lower stone and a hole in the upper stone, so you could get corn between them. If you wanted to rotate the upper stone you had to use slaves and animals to do it. The next thing human evolved was windmills. But some problems had to be solved before it could be used. For example: how do you adjust the windmill to different directions and protect the windmill against tempests? Those problems made scientists to invent something new. In the 18th centuries we devolved the engines to drive the mills.
This is how the corn milling has changed through the years:
Muscle powerslaves and animalswind and watersteam powerelectric power
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