You know the answer and I know the answer – many of us know the answer – because it is obvious. We haven’t been importing underutilized human capital since ‘64. We have been importing human capital that cant be utilized.

https://www.quora.com/Why-is-the-Flynn-effect-of-rising-IQ-scores-showing-signs-of-reversing-in-the-West-instead-of-just-leveling-off