I mean think about it, if we (us Humans the way we are now) were to be put into the wild with no knowledge at all about what was going on it would take time for us to find out about all that stuff.
Could we not have been the same exact person just that our looks were different. I mean they must have had some sort of knowledge about the solar system or some sort of hypothesis about the earth turning around by just observing the sky and the stars.
So do you think that we were as intelligent as the people in the stone age? In other words do you think that the human brain had adapted or changed with the body or just stayed the same and the body has changed over time? maby we are dummer the out ancesters, who knows.