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Is There a Genetic Influence?
There's some evidence from infants that nutrition has made a difference. So it's not an unreasonable connection, but does it negate the idea that there's a genetic influence? Not logically at all. It is very interesting so that if you take an IQ test today, and use the tables that were available in 1940, you're going to wind up with a much higher IQ number. We just zoom out. That's what it looks like as a population of getting smarter.