Thanks for your comments, Michael. In fact I've often wondered about how high levels of intelligence in a small percentage of individual human beings can arise, given the exigencies of environmental pressures. I suspect it's merely a function of our old friend the Gaussian distribution. Just as a very tiny percentage of people are very tall, so a very tiny percentage of people are very clever. But as you rightly say, being an outlier can be expensive, especially when the group in which one lives becomes agitated. As for IQ and cult adherence, it may well be a matter of personality rather than intellect, though while I've met several conspiracy theorists who all fall into the normal IQ range I've yet to meet one who appears to evince more adequate levels of cognition. But as I always say, we need large data sets because arguing from anecdote (e.g. personal experience) is generally very unwise.