Jews were considered and still are considered good with their brains.
Russians are too considered good with their brain, many successful american companies being the mastermind of Russian immigrants.
Now we're talking about Indian and Chinese scientist.
Does heredity have an effect on the brain?
Go look up the book The Son Also Rises. It caused quite a stir because some people complain it reeks of genetic determinism.
Back to the Jews, it argues that because they put high value on literacy (they can read and write at a time even European nobles are illiterate), they selected for those traits when marrying, which is what caused the stereotype of the wimpy but witty Jew. I believe it also mentioned a genetic disease affecting the eyes that somehow seem prevalent among Jews but I forgot the name.