Also, we need to take a larger view of what "intelligence" is. Take the longer view of human history, and we all are probably geniuses. Those intelligence gene

Also, we need to take a larger view of what "intelligence" is. Take the longer view of human history, and we all are probably geniuses. Those intelligence genes have indeed spread across the gene pool. It's just new ones (or new combinations of existing genes) are now showing themselves and need time to prove their fitness.