Your intelligence is not related to your brain size; rather it is linked more closely to the supply of blood to your brain. A University of Adelaide-led project which has overturned the theory of the evolution of human intelligence showed that the human brain evolved to become not only larger but more energetically costly and blood thirsty than previously believed. The research team calculated how blood flowing to the brain of human ancestors changed over time using the size of two holes at the base of the skull that allow arteries to pass to the brain. The findings allowed the