National IQs increase as literary rates rise, or as access to clean water and nutritious food increases. IQs get lower when people experience lead poisoning or early deprivation, like orphans in Romania or malnourished children in North Korea. In other words, IQ is at least partially a policy outcome. Any time someone posts something that confidently states an average IQ within a particular race or ethnicity, it’s a giveaway that their understanding of heredity effects on intelligence likely stopped with Hernstein & Murray’s The Bell Curve, which was published in 1994 and widely debunked at the time. Hernstein and Murray are a psychologist and political scientist, not geneticists, and their conclusions have been even more soundly challenged now that we have more contemporary DNA science that refutes the idea of “national IQs.”