Herb Finkelstein wrote:

> Recall, however, that in the last 35000 years human brain size has in fact
> decreased by 11%. Most of that decrease (8% of the 11%) has come in just
> the last 10000 years. This is a significant decrease in a very short period
> of evolutionary time.

But how much is genetic and how much is nutritional? We know
humans are on average a lot SMALLER, shorter and slighter,
as well. A smaller head is normal on a smaller body. Feed
your kids better and see how big and smart they grow.