Based on the title I first thought there is an open source operating system used in Germany I was not aware of. But is really true „Lüften“ is something we do

Based on the title I first thought there is an open source operating system used in Germany I was not aware of. But is really true „Lüften“ is something we do in every room every morning here. Luckily modern Bauhaus architecture style homes have windows down to the floor so that opening them is always possible because there is no sideboard with plants on top in front of the window.