"The Emperor's New Mind" by Roger Penrose.
The title is a take-off on "The Emperor's New Clothes". This book is about Artificial Intelligence and quantum mechanics. The thing that really made this a good book is that it shows that human choices can change the universe. Also, Penrose mentions that if you take a photon from one piece of matter and a photon from another piece of matter, they wouldn't be identical, they would be the same photon. This makes me think there is only one photon in the universe but that it exists in multiple places at the same time which would go against principles of physics. Quantum mechanics is made to seem to be quite different from Newton's laws of physics and leads me to believe more in the metaphysical.