From the 7^th century, farmers already had windmills for irrigation and milling. Windmill blades were mounted on the upper end while the lower part of the windmill was in charge of removing the grain, in most cases cereals, coffee and grapes. Some centuries earlier, Hero of Alexandria (20-62 AD) had invented the first windmill. It served to move the bellows of an organ.

Throughout history, and in many occasions and disciplines, the same thing was said over and over. …