Gregory Cochran: Every one of those populations that does produce science has sub-replacement fertility and is also undergoing selection for lower IQ.
What happened to the Flynn Effect?
I'd note that average intelligence is largely irrelevant here. My guess is that with selective mating, the tail has thickened at least at the top end. You know anything about this? Of course, if they always just renormalize the tests to make them gaussian, it will be hard to see.
Gwern: One of the more interesting ways science may die is something I call the ‘Agularity’: the average age of productivity keeps rising, so at some point either no one sane will invest that much of their lifetime into maybe being able to contribute or there will simply be too little time to do much new work before the normal decline with age starts around 40-50.
With better nutrition, longer lives, an increasing percentage of scientists, we should expect the age of productivity to go up.
And do a lot of people in grad school strike you as particularly sane? It's a bunch of crazy folks who like thinking all day, with the most obsessive being the most successful as the years go by. Do you think they're all going to rush off to work at Walmart, or all become lawyers?
What happened to the Flynn Effect?
Have you been following the Flynn effect research? It's dead, Jim.
My guess is that with selective mating, the tail has thickened at least at the top end.
We don't see it.
With better nutrition, longer lives, an increasing percentage of scientists, we should expect the age of productivity to go up.
None of that really follows. Better nutrition may change the baseline without affecting the arc of mental growth and decline; lives can be extended likewise; an increasing percentage of scientists doesn't help, and arguab...
From Gene Expression by Razib Khan who some of you may also know from the old gnxp site or perhaps from his BHTV debate with Eliezer.
Link to original post.