The past century has seen massive increases in IQ test scores. Professor James Flynn, discoverer of this "Flynn effect", has endeavoured to solve the puzzle of why we're getting smarter. Now he offers a new picture of human intelligence that is both surprising and illuminating.
Think of a dog, and then think of a rabbit. Quick: what do they have in common? If you immediately thought, "Rabbits and dogs both bear their young alive. Therefore, they are both mammals", you'd score well on an Intelligence Quotient (IQ) test.
But James Flynn, international authority on intelligence theory and emeritus professor at Otago University, says that if you were asked the same question a hundred years ago your answer would almost certainly have been radically different: "You use dogs to hunt rabbits."
Our grandparents would have done significantly worse on today's ...
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