IQ tests have been around for over 120 years now, haven't they? I haven't read Richard Lynn's books before, looks like I should check them out, if for anything

IQ tests have been around for over 120 years now, haven't they? I haven't read Richard Lynn's books before, looks like I should check them out, if for anything to see what's going on there. When I visited "developing" countries, there is for sure something going on (or not going on) there. IQ seems to be a factor, probably due to a lack of nutrition. Or maybe it's a more spiritual thing. Whatever it is, a study based on quantifying the difference is only so helpful either way. While I don't quite know what I saw while I was there, I know that I saw it.