The skull/brain size thing might also be related to the forming of societies which favor hive minds instead of individual intelligence.
The hive mind was helpful and probably more important for tribe survival. Idk if that explains shrinking size of the brain.
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It's some theory.
Interesting for sure
Hive mind (ie disabling independent thought to fit in with the herd) kept us alive pre-agriculture but I fully believe it is now humanity's greatest flaw.
100% it doesn’t scale
Yeah nah our societies are 100x more close-knit than before.
