There's no a priori reason to expect additivity to suddenly fail when going outside.
We just don't know at this point. On general grounds I'm suspicious of claims that in highly complex systems stochastic relationships observed for the middle of the distribution necessarily hold far into the tails. In this case I have no strong opinions on whether it will or will not hold.
MIT or Stanford or Harvard or Tsinghua graduates
By "very high IQ types" I mean geniuses. MIT, Stanford, etc. do not graduate geniuses, they graduate merely high-IQ people. Off the top of my head, I would expect geniuses to have a higher rate of mental/emotional issues and a shorter lifespan, though that's a prior, I haven't looked at data.
common variants detected by current GWAS
I'm talking about different paths.
We just don't know at this point.
Why do you have your skeptical prior? Where have similar genetic engineering efforts failed? Have we not been able to breed cows and cats and dogs and horses for all sorts of things and traits many SDs beyond their ancestral wild populations?
By "very high IQ types" I mean geniuses. MIT, Stanford, etc. do not graduate geniuses, they graduate merely high-IQ people.
If there are large negative effects then you should be able to show it by looking at the available large samples of high-IQ types, of which MIT/Sta...
I suggested recently that part of the problem with with LW was a lock of discussion posts which was caused by people not thinking of much to post about.
When I ask myself "what might be a good topic for a post?", my mind goes blank, but surely not everything that's worth saying that's related to rationality has been said.
So, is there something at the back of your mind which might be interesting? A topic which got some discussion in an open thread that could be worth pursuing?
If you've found anything which helps you generate useable ideas, please comment about it-- or possibly write a post on the subject.