I’ve heard it explained as a density problem but that doesn’t make sense too me either because then wouldn’t having a smooth brain mean it’s more solid?
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It doesn’t.
That’s based on out dated beliefs based on making broad generalizations involving animals.
Corvids (crows/raven/etc) are some of the smartest animals in nature, and they have smooth brains.
All humans have wrinkly brains, so there isn’t even a smooth brain human.
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