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In the first edition of P. Atkins' Phys. Chem., somewhere in the beginning, the statistical entropy is introduced traditionally - the probability of a single ideal gas molecule to be in a volume V, then the probability of two molecules to be in the same volume etc. In the fifth edition, at the same place, the ideal gas model is totally missing - instead, a crystal is considered. What has happened? Is the ideal gas model wrong? Should teachers continue using it or should this be avoided? I am not sure the essence of the problem would be interesting for the group (although it can be shown that the ideal gas model is not just wrong - it if fatal for chemical thermodynamics). I would only like to call your attention to the ethical aspect - on noticing a serious problem, authors just hide it without informing either teachers or students about it. I am not sure this is fair. Pentcho Valev %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%