Yeah, I agree with everything you wrote here. For extra irony, I also have Mensa-certified IQ of 176. (Which would put me 1 IQ point above the godlike superintelligence. Which is why I am waiting for Yudkowsky to build his artificial intelligence, which will become my apprentice, and together we will rule the galaxy.)
Ignoring the numbers, my point, which I probably didn't explain well, was this:
There is an upper limit to biological human intelligence (ignoring new future mutations), i.e. getting all the intelligence genes right.
It is possible that people with this maximum biological intelligence are actually less impressive than what we would expect. Maybe they are at an "average PhD" level.
And what we perceive as geniuses, e.g. Einstein or von Neumann, that's actually a combination of high biological intelligence and many other traits.
Therefore, a genetic engineering program creating thousand new max-intelligence humans could actually fail to produce a new Einstein.
Congrats! This means that you are a Mensa-certified very one-in-a-thousand-billion-special snowflake! If you believe in the doomsday argument then this ensures either the continued survival of bio-humans for another thousand years or widespread colonization of the solar system!
On the other hand, this puts quite the upper limit on the (institutional) numeracy of Mensa... wide guessing suggests that at least one in 10^3 people have sufficient numeracy to be incapable of testifying an IQ of 176 with a straight face, which would give us an upper bound on the N...
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