If time would contribute to a higher IQ test, would this mean that perhaps historicly old genes or let's say earlier civilized people among the horde/people on earth. These historicly older people have the benefit of time, let's say a certain liniage has 50 generations in it's past, like they all have offspring, while other groups culturally or geneticly didn't arrive to give birth so consequetively at each generation, that the 3 point of IQ per decade has not submitted? But sometime in between you and your partner there is also a recessive effect instead of a enrichment... Nice talk, made me think!