"What does being in a savanna have anything to do with population densities and intelligence?" The savanna is a big place. You survive in smallish groups of pe

"What does being in a savanna have anything to do with population densities and intelligence?" The savanna is a big place. You survive in smallish groups of people or die. You have to have your wits about you to survive. "The savanna theory of happiness is the idea that life satisfaction is not only determined by what’s happening in the present but also influenced by the ways our ancestors may have reacted to the event." We have adapted in the past to conditions that we now do not live in. But you are right there is no definitive link between sparsely population in savanna and crowded cities made in the article. It could be claimed to be the savanna effect. It could be smarter people are slightly more introverted. Conjecture, not conclusive.