Maybe their brains look smarter since they are using smart phones and it's been shown that cell phone ions greatly slow down cilia, some of which are located in the third ventricle of the brain. A slow brain is a calm brain, right?
The good news is that the researchers are using only 4,500 children rather than guinea pigs in this long term experiment. Those piggies can eat a lot of chow, you know, costing the taxpayers a lot of cabbage, and this study is costing $300 million already.
The outer layer of the kiddies brains became thinner, so I say keep the study going - get rid of that fat you chubby cherubs!
"Early results from the $300 million study, called Adolescent Brain Cognitive Development (ABCD), have determined that children who spend more than two hours of daily screen time score lower on thinking and language tests."
Yeah, but their thumb coordination skills are through the roof!