'We're mysterious aliens in the crowd. We jump like fleas from future to past and back again, and float like clouds of gas between nebulae; in a flash, we can reach the edge of the universe, or tunnel into a quark, or swim within a star-core... We're as unassuming as fireflies, yet our numbers grow like grass in spring. We sci-fi fans are people from the future.' - Cixin Liu, from the es[Bokinfo].