There is a minor literature on the evolution of brain cooling as potentially “blocked in early primates and then unblocked sorta-by-accident which allowed selection for brain size in hominids as a happy side effect”. I’m unsure whether the hypothesis is true or not, but people have thought about it with some care and I’ve not yet heard of anyone figuring out a clean kill shot for the idea.
There is a minor literature on the evolution of brain cooling as potentially “blocked in early primates and then unblocked sorta-by-accident which allowed selection for brain size in hominids as a happy side effect”. I’m unsure whether the hypothesis is true or not, but people have thought about it with some care and I’ve not yet heard of anyone figuring out a clean kill shot for the idea.