The thought that humans 60 000 years ago may be smarter than us today amused me. I've not read any study on the subject and the larger brain thing is just something I've heard with a foot note that larger != better tacked on.
I do suspect that an agricultural lifestyle with husbandry requires more synapses than a nomadic hunter lifestyle since wolfs, bears, etc, can manage the latter, but it would still be amusing if the OP's joke was correct in that we've gotten dumber since then (Hey, when you regularly face down grizzlies with only a stick you need smarts
Either smarts or cajones the size of grapefruit.
FORTRAN is not a flower but a weed -- it is hardy, occasionally blooms, and grows in every computer. -- A.J. Perlis