Chen's book is the fruitful result of a number of economic thermodynamic articles he has been writing over the years. The book has both its strong, e.g. sexual selection and thermodynamics, and weak points, e.g. too much reliance on Shannon's information theory, and in any event both routes provide for stimulation. An excellent quote, for instance, is: "the low entropy state is the main way of advertising for most sexually reproducing species". Whatever your background, you will enjoy your read and we look forward to Chen's follow-up book.