Remember those new Africans 'IQs' an economist found? Not so new. Here's Lynn & V., in 2012. http://www.unz.com/jthompson/africa-and-the-cold-beauty-of-maths/ …pic.twitter.com/NoTqYVq0Ja
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No one knows (humans have ~20k genes, about 50% are thought to be active in the brain, no idea how many of these are related race gaps)