its easy there are many reason y they are important here are some of the reasones:
they are renewable ,they help the world
http://www.answers.com/main/ntquery?s=windmill&gwp=13
windmill is a process of contain electricity.
Depends how big the windmill is.
I would say that the discovery of Dark matter would be the biggest discovery. But other people may have other opinions.
The windmill was made in stop cheating do your homework
windmill
What important discovery was made there
windmill
Yes glass was an important discovery
A windmill may not turn if there is not enough wind to drive its blades. Other reasons could be mechanical issues with the windmill or its components. Regular maintenance and monitoring are important for optimal performance.
why is the northwest passage have been an important discovery
the discovery was so important because they were looking for this forever
Charles Darwin made his first important discovery in Argentina.
There are many requisite for making a household windmill. I have found some important tips at site that is related to Solar power or wind energy. Hope you will get the desired answer.
windmill
they are mad because they built the windmill. During the battle of the windmill they have to rebuild the windmill
Depends how early you mean, but the discovery of fire was the first very important discovery for man, then their was the wheel, and also agriculture.