I have read that certain Ashkenazi Jews who were carrying only one copy of the Tay-Sachs gene, and were living in the ghettos in Europe, actually had a better survival rate because the gene somehow provided immunity to tuberculosis. You may like to read; "Fordham University, The Jesuit University of New York" 'Researchers Discover Cause of Genetic Disease.' http://fordham.edu/campus_resources/public.affairs/archives/2004/archive.354.asp Science Daily: 7 January 2006. "Nearly Half of All Ashkenazi Jews Descended From 'Four Founding Mothers'" http://www.sciencedaily.com/releases/2006/01/060117083446.htm Peace.
Several injured after Jerusalem protest march against Al-Aqsa restrictions dispersed (Haaretz)
from the article: Study: Israeli Jews live four years longer than Israeli Arabs