Maybe it's because they have a culture that breeds for quality over quantity. Jews seem to have a few kids, and make sure they are educated and cared for, whereas others groups seem to breed like vermin, and ignore their kids. I doubt it's genetic, because for over 1800 years their blood was mixed with every country in which they had been residing. I'm not Jewish, and my kid has an I.Q. of 141. I think the reason is, I paid a lot of attention to how Jews raise their kids. (Jah knows it wasn't genetic)
This makes me glad I haven't eaten meat in 36 years.
http://media.steamboatpilot.com/drudge/food.html?local_news
Or any city in Canada