Humans and animals with large, complex brains benefit from the need and ability to cooperate. In fact, researchers believe that "intelligence" is correlated with the size of a brain’s neural network, in our species and others may have been an adaption for tool use, for social learning, and for the accumulation of culture. Intelligence might also be the result of sexual selection. Digital organisms that evolved "brains" reveal that cooperation can drive the evolution of intelligence. These findings could explain why humans and certain other animals have such large, complex brains. Global networking could result in the evolution of ever more brainy humans in future.