They established communities throughout Central and Eastern Europe, which had been their primary region of concentration and residence until recent times, evolving their own distinctive characteristics and diasporic identities. In the late Middle Ages the center of gravity of the Ashkenazi population, and its traditional cultural life, shifted steadily eastward, out of the German lands into Poland and Lithuania (including present-day Belarus and Ukraine). In the course of the late 18th and 19th centuries, those Jews who remained in or returned to the German lands experienced a cultural reorientation; under the influence of the Haskalah and the struggle for emancipation, as well the intellectual and cultural ferment in urban centers, they gradually abandoned the use of Yiddish, while developing new forms of Jewish religious life and cultural identity.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): In the late 18th and 19th centuries, Jews who returned to German lands experienced what?
Ah, so.. a cultural reorientation

In his 2003 paper, "Human Genetic Diversity: Lewontin's Fallacy", A. W. F. Edwards argued that rather than using a locus-by-locus analysis of variation to derive taxonomy, it is possible to construct a human classification system based on characteristic genetic patterns, or clusters inferred from multilocus genetic data. Geographically based human studies since have shown that such genetic clusters can be derived from analyzing of a large number of loci which can assort individuals sampled into groups analogous to traditional continental racial groups. Joanna Mountain and Neil Risch cautioned that while genetic clusters may one day be shown to correspond to phenotypic variations between groups, such assumptions were premature as the relationship between genes and complex traits remains poorly understood. However, Risch denied such limitations render the analysis useless: "Perhaps just using someone's actual birth year is not a very good way of measuring age. Does that mean we should throw it out? ... Any category you come up with is going to be imperfect, but that doesn't preclude you from using it or the fact that it has utility."
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Risch thinks imperfect categories still have what?
Ah, so.. utility

In October 2004, Sarah Forsyth claimed that she had been dismissed unfairly by Eton College and had been bullied by senior staff. She also claimed she was instructed to do some of Prince Harry's coursework to enable him to pass AS Art. As evidence, Forsyth provided secretly recorded conversations with both Prince Harry and her Head of Department, Ian Burke. An employment tribunal in July 2005 found that she had been unfairly dismissed and criticised Burke for bullying her and for repeatedly changing his story. It also criticised the school for failing to produce its capability procedures and criticised the Head Master for not reviewing the case independently.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who was the Head Master of Eton in 2004?
Ah, so..
unanswerable