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Just a tidbit since this came up. Many years a go I asked a physics prof. I was working for as a "gravity wave istudent ntern" (as we said in the 70's, it was heavy, man) about the absolute zero thing. He said it was not impossible to get to abs. 0, -- but that no work could be extracted from the system. So, my followup was: Well, does that mean it is unobservable (work is done on a system to measure or look at it). His reply was paraphrased as "Maybe, now go work on the helium vacuum pump."
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