Water is one of our most important natural resources - from nourishment to energy, we depend on the precious liquid everyday. Even in pre-historic times, man harnessed the power of water, using hydro power to grind grains and operate saw mills. That age-old technology is arguably more important today than ever, with energy costs rising and the burden on the environment growing. This week, we take a look at the role of the driving force of water in modern times. Reporter Birgitta Schülke visits millers in Nepal who not only use hydro power to grind grains, but  also generate electricity for their families and communities. In our background report, Hanno Böck shows us how the same technology is enjoying a revival in Germany. He takes us to the Uckermark region north of Berlin, where mills that were long defunct have been restored and upgraded are now working at full speed to generate electricity.