Billy wrote:

We're all getting smaller and our brains are shrinking... is farming to
blame?

Large size is not as much an advantage in farming as it is in hunting.

And if that¹s not depressing enough, our brains are also smaller.

Brain size is highly correlated with intelligence speciies to species.

Brain size is poorly correlated with intelligence within a species.

There's no sign that we have been losing intelligence along with brain
size. Except UseNet posts. Those are a pretty good sign. ;^)