Re: It's one thing to make a law...
Wouldn't that mean cavemen were all geniuses?
Given the lack of "sum total of human knowldge" at that point, and that they managed to even survive against the elements and the environment, I'd say they were pretty smart!
The information one has available does not show one's intellect, it's how one creates new information or fills in the gaps in their knowledge that shows.
With the knowledge resources you have today, if placed in their environment, could you feed, clothe and shelter yourself? Could you make tools to hunt with? Could you make a stone blade to help cut fibre?
And even if you can, how many university-educated people today could manage it?
I'm not so sure their intellect was as limited as many make out. Total knowledge sure, but intellect?