Do social pressures cause the evolution of big brains? The debate is ongoing...Why are humans so smart? We must have evolved in an environment that made more intelligent individuals likely to survive. But this just raises new questions: what factors in the environment could have created an evolutionary pressure for intelligence? And how have other species that faced similar pressures ended up evolving?

Do social pressures cause the evolution of big brains? The debate is ongoing...Why are humans so smart? We must have evolved in an environment that made more intelligent individuals likely to survive. But this just raises new questions: what factors in the environment could have created an evolutionary pressure for intelligence? And how have other species that faced similar pressures ended up evolving?