I have somehow not heard of this case, but there’s an ongoing case in Sweden where a 80-ish year old man, Bertil Malmberg, talked about the intelligence of nations, specifically mentioning that South Sudan’s recorded mean intelligence is one of the lowest in the world (Mankind Quarterly has no less than 15 recent studies from Sudan). In his words (Google translated from Swedish): It is relevant that the population there is among the peoples with the lowest intelligence in the entire world, which is well documented in research. According to the UN, the country has a very low HDI (Human...
