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Did Jewish intelligence evolve in tandem with Jewish diseases as a result of discrimination in the ghettos of medieval Europe? That's the premise of a controversial new study that has some preening and others plotzing. What genetic science can tell us-and what it can't.
THIS STORY BEGINS, as it inevitably must, in the Old Country.
At some point during the tenth century, a group of Jews abandoned the lush hills of Lucca, Italy, and-at the invitation of Charlemagne-headed for the severer climes of the Rhineland and Northern France. These Jews didn't have a name for themselves, at first. They were tied together mostly by kinship. But ultimately, they became known as Ashkenazim, a variation on the Hebrew word for one of Noah's grandsons.
In some ways, life was good for the Jews in this strange new place. They'd been lured there on favorable terms, with promises of physical protection, peaceful travel, and the ability to adjudicate their own quarrels. (The charter of Henry IV, dated 1090, includes this assurance: "If anyone shall wound a Jew, but not mortally, he shall pay one pound of gold... If he is unable to pay the prescribed amount... his eyes will be put out and his right hand cut off.") But in other ways, life was difficult. The Ashkenazim couldn't own land. They were banned from the guilds. They were heavily taxed.
Yet the Ashkenazim did very well, in spite of these constraints, because they found an ingenious way to adapt to their new environment that didn't rely on physical labor. What they noticed, as they set up their towns, located mainly at the crossroads of trade routes, was that there was no one around to lend money.
So there it was: a demand and a new supplier. Because of the Christian prohibition against usury, Jews found themselves a financially indispensable place in their new home, extending loans to peasants, tradesmen, knights, courtiers, even the occasional monastery. The records from these days are scarce. But where they exist, they are often startling. In 1270, for example, 80 percent of the 228 adult Jewish males in Perpignan, France, made their living lending money to their Gentile neighbors, according to Marcus Arkin's Aspects of Jewish Economic History. One of the...