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Since at least the time of the Ancient Greeks, a proportion of Jews have assimilated into the wider non-Jewish society around them, by either choice or force, ceasing to practice Judaism and losing their Jewish identity. Assimilation took place in all areas, and during all time periods, with some Jewish communities, for example the Kaifeng Jews of China, disappearing entirely. The advent of the Jewish Enlightenment of the 18th century (see Haskalah) and the subsequent emancipation of the Jewish populations of Europe and America in the 19th century, accelerated the situation, encouraging Jews to increasingly participate in, and become part of, secular society. The result has been a growing trend of assimilation, as Jews marry non-Jewish spouses and stop participating in the Jewish community.
Name a Jewish community that disappeared entirely?
A: Kaifeng Jews of China

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In soil, microorganisms that reside in the rhizosphere (a zone that includes the root surface and the soil that adheres to the root after gentle shaking) carry out nitrogen fixation, converting nitrogen gas to nitrogenous compounds. This serves to provide an easily absorbable form of nitrogen for many plants, which cannot fix nitrogen themselves. Many other bacteria are found as symbionts in humans and other organisms. For example, the presence of over 1,000 bacterial species in the normal human gut flora of the intestines can contribute to gut immunity, synthesise vitamins, such as folic acid, vitamin K and biotin, convert sugars to lactic acid (see Lactobacillus), as well as fermenting complex undigestible carbohydrates. The presence of this gut flora also inhibits the growth of potentially pathogenic bacteria (usually through competitive exclusion) and these beneficial bacteria are consequently sold as probiotic dietary supplements.
What do bacteria do in soil?
A: converting nitrogen gas to nitrogenous compounds

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The two travel to the hotel and discover White's secret room where they find co-ordinates pointing to Oberhauser's operations base in the desert. They travel by train to the nearest station, but are once again confronted by Hinx; they engage in a fight throughout the train in which Mr Hinx is eventually thrown off the train by Bond with Swann's assistance. After arriving at the station, Bond and Swann are escorted to Oberhauser's base. There, he reveals that Spectre has been staging terrorist attacks around the world, creating a need for the Nine Eyes programme. In return Spectre will be given unlimited access to intelligence gathered by Nine Eyes. Bond is tortured as Oberhauser discusses their shared history: after the younger Bond was orphaned, Oberhauser's father, Hannes, became his temporary guardian. Believing that Bond supplanted his role as son, Oberhauser killed his father and staged his own death, subsequently adopting the name Ernst Stavro Blofeld and going on to form Spectre. Bond and Swann escape, destroying the base in the process, leaving Blofeld to apparently die during the explosion.
What did Oberhauser call himself after he faked his death?
A: Ernst Stavro Blofeld

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Besides the city wall, other famous Ming-era structures in the city included the famous Ming Xiaoling Mausoleum and Porcelain Tower, although the latter was destroyed by the Taipings in the 19th century either in order to prevent a hostile faction from using it to observe and shell the city or from superstitious fear of its geomantic properties.
One possibility the Tower was destroyed was to prevent it's use by a hostile enemy. What is the other possibility?
A:
superstitious fear of its geomantic properties