I read the book with great interest. I enjoyed parts I (Cognitive Revolution), II (Agricultural Revolution), and III (Unification of Mankind) very much. Rich detail, very well formulated and researched on the basis of innumerable good sources. My doubts start in part IV (The Scientific Revolution), especially at the end (Chapters 18-20), in which the books makes a step from historical research towards developing thoughts about the future. He may be right when writing "Sapiens are incapable of breaking free of their biologically determined limits. But as the twenty-first century unfolds, this is no longer true: Homo sapiens is transcending those limits. It is now beginning to break the laws of natural selection, replacing with the laws of intelligent design." From this point, Harari starts to speculate on what that could mean. That is where the book should end. Nobody is capable of predicting the future. And as we know from history, all speculation on the future will prove to be wrong, most proably completely wrong. I highly appreciate Harari's historical analysis, but I do not need his speculations. I won't buy his follow-up book.
Good starting chapter and certainly very interesting book. However the final chapters were too derived and subjective for a history or factual book. Too bad an otherwise good book couldn't keep the high level of the start but still worth the read.