The title had me captivated. However:
This post could use some more exposition in between the quotes. When "parasite load" was mentioned, my immediate assumption was that this was a metaphorical usage referring to "parasitic" ideas or memes, and was quite confused when I encountered a discussion of skin infections and whatnot, suggesting that somehow the literal sense of biological parasites was intended. This was confusing because I wasn't expecting any connection between psychological personality traits such as openness on the one hand and susceptibility to infectious disease on the other. Maybe such a connection is well-known in some circles, but I was totally unprepared for it and it came across to me as a bizarrely privileged hypothesis. Some more emphatic exposition, saying in effect "yes reader, I really do intend to relate the personality trait of openness to the medical phenomenon of infectious diseases" would have been helpful.
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Are we encouraged to estimate IQ from SAT tests and the like? That's what I did. That could reduce the excluded-middle bias that Gedusa mentions.
I underwent a real IQ test when I was young, and so I can say that this estimation significantly overshoots my actual score. But that's because it factors in test-taking as a skill (one that I'm good at). Then again, I'm also a little shocked that the table on that site puts an SAT score of 1420 at the 99.9th percentile. At my high school there were, to my knowledge, at least 10 people with that high of a score (and that's only those I knew of), not to mention one perfect score. This is out of ~700 people. Does that mean my school was, on average, at the 90th percentile of intelligence? Or just at the 90th percentile of studying hard (much more likely I think).