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A book that can be understood by anyone, starting from high school students. I have read the book for 4 times. once every year since i was 14 years old. Each new reading gave me a new understanding of the book & it's contents. It's written in a way that it can be read and understood in accordance the the level of the reader. A high school student can read it without the need of having much mathematical knowledge. A higher level of mathematics gives the reader a clearer view of the results obtained from some simple derivations - like Lorentz derivation -.