From the reviews: The book is a short, clear and elementary introduction to the main ideas of Special Relativity and General Relativity. The primary target was an audience of well-trained high school students, interested in a course beyond the popular science expositions. The contents reveals the aim of the author, to cover both the classic theory and the modern history of the Relativity Theory ... . (Gabriel Teodor Pripoae, Zentralblatt MATH, Vol. 1244, 2012)