>Well, you mention evolution . . . let's back it up 10,000 or 20,000 years. The "caveman" with the better memory might be better at remembering where the water is, where the best place to hunt is, what he saw some other caveman doing that also might benefit him, etc., etc., etc., and therefore may have a better chance of survival. Having a good memory is - IMHO - an undeniable benefit to a human.

I agree,
but it is better to have of a lot if you are a much mistrustful one of same you.

In other words,
it must have memory a lot and critical sense of the own memory a lot, too.
Not easy.

Fabio