We now know that it has taken 3.8 billions of years of work by the forces of evolution to turn what was once a lump of barren rock into the rich diversity of into plants, animals and microbes that surround us. In the process, evolution has created all manner of useful adaptions, from biological computers (brains) to a system to capture energy from the sun (photosynthesis). But how does evolution actually work? In Evolution, leading biologists and New Scientist take you on a journey of a lifetime, exploring the question of whether life is inevitable or a one-off fluke, and how it got kick-started. Does evolution have a purpose or direction? Are selfish genes really the driving force of evolution? And is evolution itself evolving?