Quite a dense and chewy book, and one that is stronger when it sticks to the areas closest to Greene’s expertise (hard physics). It becomes quite vague and waffling in areas farthest from his (professional) expertise. The book often relies on assertions as to the likely answer to some of our thorniest questions (such as consciousness) which I think comes across as intellectually incurious and rather dogmatic. It is disappointing that he does not make an effort to engage with arguments that challenge his physicalist preferences.