I’m not much into sci-fi since most of the sci-fi I found blamed everything on time travel paradoxes, wormhole stuff and relativity theory. But this one I really enjoyed not only because of the story but because it containes a real scientific problems and theories (not only those mentioned above). It contains real chinese history and after all it not only entertain me but teach me something more. I was sceptical at first but after few chapters I couldn’t put it away. Can’t wait for another book.