Not for plebs who want a casual read but are able to engage the material in a technical way. Not like his First Three Minutes but as the book says these are lectures in the best of tradition, think Chandrasekhar, Eddington, Peebles, etc. Very mathematical but the physics is not lost in the masterly crispness of exposition. I found that reading his semi-popular works immensely helps in reading some of the more technical works.<br><br>Update -<br>It's sad to have lost Steven Weinberg. It feels personal somehow. He was from a generation that sported greats like Feynman, Wheeler, Schwinger, and all the others from the post-war generation. As a Physicist, only a great physicist may comment on his greatness but I do think that he was a great man based on his scientific writings for the public. Richard Dawkins rightly called him 'A real public intellectual in an era where the term intellectual is bandied about'. For me reading his book The First Three Minutes was an eye opener of how great physicists think but also helps convey deep and unintuitive knowledge in a way that's not jargon driven but hits the mark every time. Never one to talk down to his audience, his books are a friend holding your hand. Where he is technical, he implicitly considers you to be fluent in mathematics to follow the scientific argument.<br><br>To 'Explain the world' will seal Weinberg as not only a physicist of great measure but equally in his immense writing skills to comment on its historical evolution. That's rare. Physics or its History is usually the preserve of specialists in one field or the other but not both as a Physicist and Historian of Science.  As a historian, he's in the class of Pais who was like him both but I feel Steven Weinberg was clearly the greater physicist (based on his unification work) and given his breadth and depth of span in this field. I mean the list is like everything!! Particle, Relativity, Cosmology, QM, QFT, Semi-Technical writing. The man was a monster mind in the class of the front-line physicists like Heisenberg, Einstein, Eddington, or Schrodinger