> This was mainly due to improvements in childhood nutrition, healthcare, and education in the post war period. Even controlling for these improvements, the Fl

> This was mainly due to improvements in childhood nutrition, healthcare, and education in the post war period. Even controlling for these improvements, the Flynn Effect is still happening. The cause of the Flynn Effect is as-yet unknown, but it is not due to these improvements. There's speculation that it's due to society increasingly being an environment that develops abstract thinking, which is the kind of thinking that is tested in IQ tests. So it's not that people are organically developing a higher IQ, but that people are just getting better at IQ tests