The first 40 pages were good, there he summarised experts' knowledge about the brain.
Then he tried to develop a model of consciousness. Anyone who ever talked with any biologist researcher knows that one has to use the statistic for any kind of modeling in anything that has to do with biologic organisms. And Dr. Kaku knows statistics because his specialty is particle physics, meaning he has to deal with quantum mechanics which is statistical in nature.
Yet, he barely used math. He just used the style of the model presentation that sounds like a scientific paper, the style he knows well after 70 such publications. But that was it. The model is so full of holes that even non-expert like me can see them. I expect experts to find it a good joke.
From there, everything went downhill. The rest of the book is basically proof that the Dunning - Kruger effect applies to every human regardless to their education and achievement levels. He used his faulty model of consciousness to explain topics from conspiracy theories, fantasy, and movies. In one chapter he actually summarised a movie as an argument. Really?
The biggest disappointment was the chapter on AI. He's a physicist, for f sake! I was expecting him to at least get that part right. No. He didn't.
In essence, the whole book is a mixture of short summary of the latest advances in neuroscience (TED talks provide more useful info) and one human non-expert opinion on the mish-mash of topics that usually drags the attention of quacks and conspiracy theorists.
Very disappointing, because as a fellow scientist, I would expect Dr. Kaku to at least admit he cannot know more than experts from the area.
He didn't.
Very disappointing, especially because Dr. Kaku is marvelous at popularization of physics.