American IQ scores have rapidly dropped, proving the 'Reverse Flynn effect'

In the absence of reasonably strong natural selection pressure to select for red hair, how could red hair not be disappearing over time?

This is somewhat tongue in cheek, obviously. But to spell out my point, genetic inheritance is way more complex than most of the comments here are treating it.

If you can’t confidently explain how people with brown hair can keep having red-headed kids, it might be challenging to understand why average parents can produce smart kids (or vice versa).