For tens of thousands of years, human brains have been about the same as they are now.
About 65% functioning, and the other 35% Democrats!?
Those ancient humans archeologists constantly express surprise over were the ones who discovered or invented the very foundations of math and science that we build on today.
Some of their feats of architecture are amazing, and more so if they were as ignorant as archeologists make them out to be,
While great discoveries are still being made today, we are building on easily gained knowledge, which is an unfair advantage, in some respects. The men of great genius who laid these foundations were way beyond most of what we see today.