This novel is really a classic science fiction novel, and takes us in the hypothetical future Earth where the future of mankind is highlighted: it is a warning of the author. It is perfect for those new to science fiction, those who love travel stories in time and anticipation, and those who like short books (166 pages, it's short) and captivating. Certainly he starts dating, and some facts based on science can bring joy to scientists but there is still an important book that has marked the history of science fiction.
