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Comment Re:Could we hear some Germans tell this story? (Score 4, Informative) 473

look up 'cavity wall' which has been pretty much standard in europe since the sixties; and since the eighties they where standard equiped with insulation aterial between them. I expect by 2020 http://en.wikipedia.org/wiki/Passive_house to be the building standard in most of europe.

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Every nonzero finite dimensional inner product space has an orthonormal basis. It makes sense, when you don't think about it.