@the_beebs IQ tests have their genesis in eugenics. But you know what I would be really be curious to see, an IQ meta-analysis that controls only for weather or not children are hit and yelled at by there parents. That's it, just that one! And maybe measure cortisol levels and gray matter development in the brain. The measurements are infinite, but that control one control is super important, I'm curious, and I think it's relevant.