Problem: Black people:

Due to the often political and cultural contours of blackness in the United States, the notion of blackness can also be extended to non-black people. Toni Morrison once described Bill Clinton as the first black President of the United States, because, as she put it, he displayed "almost every trope of blackness". Christopher Hitchens was offended by the notion of Clinton as the first black president, noting, "Mr Clinton, according to Toni Morrison, the Nobel Prize-winning novelist, is our first black President, the first to come from the broken home, the alcoholic mother, the under-the-bridge shadows of our ranking systems. Thus, we may have lost the mystical power to divine diabolism, but we can still divine blackness by the following symptoms: broken homes, alcoholic mothers, under-the-bridge habits and (presumable from the rest of [Arthur] Miller's senescent musings) the tendency to sexual predation and to shameless perjury about same." Some black activists were also offended, claiming that Clinton used his knowledge of black culture to exploit black people for political gain as no other president had before, while not serving black interests. They cite the lack of action during the Rwandan Genocide and his welfare reform, which Larry Roberts said had led to the worst child poverty since the 1960s. Others cited that the number of black people in jail increased during his administration.

Who was offended by Clinton being referred to as black?
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A: Christopher Hitchens


Problem: Within Shia Islam (Shiism), the various sects came into being because they differed over their Imams' successions, just as the Shia - Sunni separation within Islam itself had come into being from the dispute that had arisen over the succession to Muhammad. Each succession dispute brought forth a different tariqah (literal meaning 'path'; extended meaning 'sect') within Shia Islam. Each Shia tariqah followed its own particular Imam's dynasty, thus resulting in different numbers of Imams for each particular Shia tariqah. When the dynastic line of the separating successor Imam ended with no heir to succeed him, then either he (the last Imam) or his unborn successor was believed to have gone into concealment, that is, The Occultation.
Why did different sects come about within Shiism?
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Answer: they differed over their Imams' successions


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
During the later stages of World War II, the entire Cold War, and to a lesser extent afterwards, uranium-235 has been used as the fissile explosive material to produce nuclear weapons. Initially, two major types of fission bombs were built: a relatively simple device that uses uranium-235 and a more complicated mechanism that uses plutonium-239 derived from uranium-238. Later, a much more complicated and far more powerful type of fission/fusion bomb (thermonuclear weapon) was built, that uses a plutonium-based device to cause a mixture of tritium and deuterium to undergo nuclear fusion. Such bombs are jacketed in a non-fissile (unenriched) uranium case, and they derive more than half their power from the fission of this material by fast neutrons from the nuclear fusion process.
During what war was uranium-235 last used to create nuclear weapons?
A: unanswerable


Context and question: Chopin's mazurkas and waltzes are all in straightforward ternary or episodic form, sometimes with a coda. The mazurkas often show more folk features than many of his other works, sometimes including modal scales and harmonies and the use of drone basses. However, some also show unusual sophistication, for example Op. 63 No. 3, which includes a canon at one beat's distance, a great rarity in music.
Chopin's mazurkas contain more of what than his other compositions? 
Answer: folk features


Question: In 1820-1830’s the Ottoman Empire endured a number of strikes which challenged the existence of the country. The Greek Uprising (began in the spring of 1821) evidenced internal and military weakness of Ottoman Empire and caused severe atrocities by Ottoman military forces (see Chios massacre). The disbandment of the centuries-old Janissary corps by Sultan Mahmud II on 15 June 1826 (Auspicious Incident) was a good deed for the country in the longer term, but it has deprived the country from its army forces for the nearest future. In 1827 the allied Anglo-Franco-Russian fleet destroyed almost all the Ottoman naval forces during the Battle of Navarino. In 1830 Greece becomes an independent state after 10 years of independence war and the Russo-Turkish War of 1828–1829. According to the Treaty of Adrianople (1829) Russian and European commercial ships were authorized to freely pass through Black Sea straits, Serbia received autonomy, and Danubian Principalities (Moldavia and Walachia) became the territories under Russian protection.
Is there an answer to this question: Who disbanded the Janissary corps?

Answer: Sultan Mahmud II


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A more sophisticated MP3 encoder can produce variable bitrate audio. MPEG audio may use bitrate switching on a per-frame basis, but only layer III decoders must support it. VBR is used when the goal is to achieve a fixed level of quality. The final file size of a VBR encoding is less predictable than with constant bitrate. Average bitrate is VBR implemented as a compromise between the two: the bitrate is allowed to vary for more consistent quality, but is controlled to remain near an average value chosen by the user, for predictable file sizes. Although an MP3 decoder must support VBR to be standards compliant, historically some decoders have bugs with VBR decoding, particularly before VBR encoders became widespread.
An average bit rate is used when who choses an average value for the encoder to use?
A:
the user