Mind
Our brain evolved from two primitive nervous systems that merged
The front and back parts of our brain come from different progenitor cells in embryos, which suggests they evolved as separate entities
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The front and back parts of our brain come from different progenitor cells in embryos, which suggests they evolved as separate entities
A popular idea suggests a link between big brains and a rich social life, but octopuses don't fit the pattern, which suggests something else is going on