In the tradition of Richard Dawkins's The Selfish Gene, a profound and engaging look at the hidden relationships underpinning human evolution, and why cooperation is key to our future survival. Cooperation is the means by which life arose in the first place. It's how we progressed through scale and complexity, from free-floating strands of genetic material, to nation states. But given what we know about the mechanisms of evolution, cooperation is also something of a puzzle. How does cooperation begin, when on a Darwinian level, all that the genes in your body care about is being passed on to the next generation? Why do meerkat colonies care for one another's children? Why do babbler birds in the Kalahari form colonies in which only a single pair breeds? And how come some coral wrasse fish actually punish each other for harming fish from another species? A biologist by training, Raihani looks at where and how collaborative behavior emerges throughout the...