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The size of the brain in the sense that it would be "different" than a smaller brain. Perhaps both brains are structured exactly the same, thus being exactly the same in capability, but the larger brain simply requires more blood to be used thus having a weaker overall physicality? Brain anatomy is very complicated, so it's best to stray away from simplistic, ignorant, and black/white theories when concerning the subject. Because they are specialized for that. Humans have brains capable of doing many more other things. If that is true, how can bees be so much smarter than humans in solving 'traveling salesman' problems?[1]Size of the brain matters.