When did our IQs start rising every year?

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The Industrial Revolution (the advent of new manufacturing processes that began in the middle of the 18th century) needed an educated workforce and created more intellectually-demanding jobs: just two factors that triggered a constant rise in IQs. Jim Flynn, Emeritus Professor of Political Studies at the University of Otago in Dunedin, New Zealand, explains. Image: Young woman writing on a board Credit: Thinkstock