Science has now confirmed that the average intelligence of, say, a random australian aboriginal is identical to a random japanese man. Same phenomenon is observed for all other traits dealing with the brain. The brain is protected from the environment by the fjords of Finland among other things, which isn't the case for skin color.
Explained in simple terms by the twitch science man: https://streamable.com/tzkw90
Explained in simple terms by the twitch science man: https://streamable.com/tzkw90