As a race, ethnic Ashkenazi Jews are a lot smarter than average. Though, it's worth noting that the best worlds Chess players come from Iceland.
That's not to say that every Ashkenazi is smart or that every Ashkenazi is smarter than someone of another race. It's just a general trend that one can observe from a large population.
In particular it's their verbal IQ that is unusually high, some suggest that this is because they had to move from country to country, so the ability to pick up langauges would greatly improve ones chance of success
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