Great book! Gives accurate explanation that could be in any scientific book, no pre-knowledge in this matter is needed even though I found having pre-knowledge of Newtonian rules to be helpful. Example: Page 71-72 explains so nicely the difference between the pedagogical model and the reality of the model. Some flaws I think to find is the lack of putting acceleration and force into the theories of time. Author argues very well that speed slows time but also says speed could be inferred to all other objects instead of the "speeding object". I find the authors mention of acceleration into this of being to brief. No real context between speed, time, force and acceleration is given. Furthermore, I believe time can be said to be non-existing, a clock and a rotating earth is just two happenings that are synchronized, this could have been mentioned. All in all, great joy is felt while reading this book!