It’s a daring thing to write a whole book about a man while confessing early on that ‘we know almost nothing of his readings, life, character, appearance or voyages’, and of whose writings only a three-line fragment survives. Luckily, as with many ancient authors, the works of the 6th-century BC philosopher Anaximander are described in subsequent treatises, and a resourceful writer can infer much from this evidence about what might have been ‘the first great scientific revolution in human history’.