The Evolution Of Ashkenazi Jewish Intelligence

Randall Parker references an NYT article with this comment:

"Well, three researchers at the University of Utah, anthropologist Henry Harpending, Gregory Cochran (a Ph.D. physicist turned genetic theorist), and Jason Hardy put forth a hypothesis that seeks to explain both mysteries simultaneously. Nicholas Wade of the New York Times has written one of the two news stories about it to date. The proposed hypothesis holds that Jews developed their genetic diseases as a side effect of strong selective pressures for higher intelligence during the Middle Ages as they were forced to work mainly in occupations that required greater cognitive ability."

The idea of ethno-centric enhanced intelligence would be tougher to prove if the enhanced intelligence didn't correlate with genetic diseases. In his discussion Randall talks about the trade-off that comes with evolutionary intelligence enhancement. How many diseased children can we tolerate in order to have smarter children?