Dear Chaim,
This is in response to your statement on the previous program about the Jewish race. You said that the two sides of you family look very differently, as do Ashkenazi and Sephardic Jews, and this is why you doubt the existence of the Jewish race. Chaim, there is an explanation for this. There is an effect called "the genetic drift" that explains why isolated populations of the same group end up drifting apart with respect to their phenotype. There were several genetic studies in the last 7 or 8 years, such as Ariella Oppenheim's study that proved that Ashkenazi and Sephardic Jews are, basically, the same people, even though their genes have a small admixture of the surrounding population genes.