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RE: Human Intelligence is Unique in our Universe
The human brain is very expensive... you can't maintain everything else and a very large brain... therefore from an evolutionary perspective - if you don't use it - you lose it.
If you take a close look at our evolution @gavvet , you will see that as we slowly developed settlements our insticts started diminishing. There was no need for them in protective environments. We rather induced our brain evolution on the expense of everything else. Is this what you mean?