What did the windmill do?

Simply because they are Mills that run on Wind power

engine driven by the wind, traditionally built mostly of wood, used to grind grain, but also widely used for other tasks such as pumping water

Windmills were originally just that, a wind-powered grain mill (to turn grain into flour). Many "windmills", for instance those scattered around the Australian outback, are actually "wind pumps" to...

There are different ways to start, but the most preferred is in the freeze position. In the freeze, you stab one elbow into your abs and place the other hand near your head. There, you should be...

To harvest the power of the wind to generate energy.