To be fair, the author does acknowledge that: > Oleson is quick to point out that the results presented in his book should be seen as preliminary rather than c

To be fair, the author does acknowledge that: > Oleson is quick to point out that the results presented in his book should be seen as preliminary rather than conclusive, especially considering how rare his subjects are. Another issue is that the bulk of his gifted cohort was recruited from a private high-IQ society, and people who join such clubs might not represent highly intelligent people in general.