Ah yes, the “super geniuses.”
Hi. You never read about me in the papers, because I was only two years ahead of everyone else instead of eight or ten–(Clarification: I was in my hometown newspaper several times. <sigh> )–but I estimate I’m in the top 1/10th to 1/100th of one percent of the population.
I don’t think it’s so much that smart people eventually catch up as that the “supergeniuses” eventually slow down. This happens for several reasons:
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They eventually come to a level of work that challenges their minds–for me this was my third and fourth year of college. For some of these kids it seems to be postdoctoral research. <shrug>
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They get tired of pushing themselves. Or mom and dad stop pushing them when they turn 18. (This latter is, IMO, one of the most evil things parents can do to their children; even the grades I skipped were not forced upon me).
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They get tired of being so damned smart. Tired of the attention, tired of being expected to outperform everyone at everything. This is part of what’s happened to me. I started my Ph.D. and am now in the proces of extricating myself from the program so I can pursue plain ol’ lab-rat research for 25k a year, and write science fiction in my spare time.
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They go insane. Unfortunate but true. I have heard of one girl who got straight A’s through elementary, high school, and college, up into graduate school. The last class she took in graduate school, she got a B.
After which she went into a suicidal depression from which she could not be roused for six months, and from which I doubt she ever fully recovered.
My own bout with depression started about the time I started grad school and is still ongoing.
As to Nobel prizes and such not being won by them (“us”?)–the odds are against it. We’re flukes of nature, a set of random genes that puts together a highly inteligent brain. Nobel Prizes are flukes of science/literature/what-have-you, things so extraordinary that, well, they only are awarded once a year, and only a few people have ever earned more than one.
You don’t often get the privilege of two really good flukes in your lifetime. Maybe one good and one bad, but not two good. Those would be the extremely rare people. Like Marie Curie, for instance.
I very much wish I weren’t so damn smart–because people still expect me to outperform, and I’m tired of doing it.
There’s a nice, personal perspective for you 
(And, sorry, andygirl, I can’t prove you wrong. In fact, just the opposite).
LL