@garry I know that there are going to be a significant number of parents like my wife and I who will be strictly regulating screen time for our kids (especially personal smartphone use, which will be essentially none until they are teenagers). I hope that there will be thorough studies on this group versus groups of kids from households with no regulation of this kind to get a good understanding of what thhe effects are. I know that studies are already published to this effect (and the results are not promising for excessive screen users) but we are really only at the front end of this thing, which, in my opinion, is going to turn into an even bigger influence on the general health of our societies than childhood obesity.