This book is incomplete. The author did not include a pdf of supplementary material like every other science audio book ever. I wonder how much shorter this book would be if I were to remove every instance where the narrator say “Those equations are available in the print and E book versions of this book”. Or where he says that it would take a whole book just to cover one subject and then skips it. The book is worth listening to as long as you care about the history of thermodynamics and nothing about actual modern thermodynamics. I will think more than twice before buying anything from this author again. But I will absolutely listen to this narrator again. Very good job. While I am not going to ask for my money back, I will say he gives a solid foundation into the early players of thermodynamics.