creatures but most of what we mistake for intelligence is actually the effects of language.
It was probably the sudden arisal of a speech center in the brain that led immediately to
complicated language and the ability to pss knowledge from generation to generation that
propelled human knowledge and human science to understand his enviroiment in terms of
logic and observation.
That's a popular theory.
Coincided with language. We don't know if language caused it or some other development resulted in improved communications.