Poor nutrition?
It tells us that the USDA has been spiking the WIC cheese with brain shrinking drugs
Same stuff they give cows to keep cows from evolving into chickens /s
It is a plot to keep the poo peoples down. Moooshell will fix if wit her chillin fooh pwogwam fwom the hood.
Its a simple fact. Poor early childhood nutrition will naturally lead to physical underdevelopment. Brains need the right kinds of fat to grow. Its one of the likely reasons Eskimos have the largest brains as a group. They have traditionally had a very high fat diet.
Intelligence is really a very different issue that is only marginally tied to brain size. Ben Carson grew up poor but is far from stupid. He had a mother who cared enough to drive and challenge him.
I grew up poor but have done OK because I had a very different childhood than most kids of today. I was outside all the time absorbing every bit of knowledge and when I was inside, I had a house full of books. I loved TV and still do but I didn’t have cartoons or stupidity TV to watch 24/7. 2 hours of Saturday morning cartoons was pretty much it unless there was a nature show on PBS which you couldn’t tear me away from.
Todays social stratification didn’t exist so much in the past as it does today either. FReeper LS pointed out the “Superzips” to me on twitter the other day where you have whole zip codes where you won’t meet a single “poor” person. Those didn’t really exist 50 years ago. Rich and poor kids played together and learned together. (I’m not suggesting a government solution BTW)