Off subject a bit here, but I thought I would mention our beer culture here in the Rhineland. In Köln we drink Kölsch, but the Düsseldorfer have to make do with Alt Bier. Now Cologne is a few miles upstream... We take water from the river to brew and after we have drunk it we return it to the river, which flows north east. Now you know why we drink Kölsch and the Düsseldorfer drink Alt...