Besides Master Bates, Who Else is Related to Me?

Interesting study done by some doctors in Israel. Basically, they studied DNA and found that four women are the source of nearly half the Ashkenazi Jews in the world. Somehow these women left their genetic signature, something unique to them, that could only be passed on to their daughters. And 40% of the Ashkenazi Jews studied had it, while by and large it was absent from other Jewish and Non-Jewish populations.