Damn, I'm half Ashkenasi and half Sefaradi, that's why I'm so intelligent then
It may also be due to the fact that Jews in the old time had to study a lot, especially religious study. So it helped us in secular studies as well. Same things go for Chinese and Japanese where education is a very important thing.
Nowadays however, we are witnessing a dumbening of the general population regardless of their race or religion.
This has been another public service annoncement from PussyMan