Our future lies in renewable energies. The fossil fuels coal, oil and gas will be used up within the next 50 to 300 years and are ecologically questionable just like nuclear energy, too. The sun, however, provides more energy than we need. Besides water power, sun light and bio mass, WIND ENERGY, most crucially, belongs to the renewable energies that have been used already for centuries. But what is wind? How was its energy generated, transformed and used in the past and how is this done today?