The book makes an interesting read and is light enough to make good bed-time reading. I personally found the quality in the treatment of subjects varied:
Physics and astrology: I found the chapters on these topics to be the highlight of the book. I am not a physicist myself so the attraction might hvae come from the accessible treatment of the subjects.
Biology: Topics tackled in an insightful way, but not in a manner which I found sufficiently deep or satisfying. It really gave me the impression that there could have been more to go into.
Psychology: This is my subject matter and I was completely let down in the treatment of subjects like the placebo effect. The treatment was higly superficial and lacking in depth.
Overall I would recommend this as a read to the lay person interested in science topics, however for anyone interested in depth rather than breadth this will prove to be a limited (but enjoyable) read.