Scandinavia and the World
Scandinavia and the World

Comments #9512918:

Be careful what you say 7 8, 3:41am

But it is speculated (concerning afro-africans) that the adaptations to many tropical disease vectors might come at the expense of intelligence. Everything is a tradeoff. So, yes. :D
(edit. Yes to the detrimental effect of tropical diseases to the average intelligence; however that statement tells nothing about the absolute comparison with the caucasians)

Mongoloids have had input from neanderthals and denisovans and perhaps other hominids who all have had to adapt for colder climate (esp in the mountainous areas) than that in sub-Saharan Africa.