Problem: BeiDou Navigation Satellite System:

In December 2011, Xinhua stated that "[t]he basic structure of the Beidou system has now been established, and engineers are now conducting comprehensive system test and evaluation. The system will provide test-run services of positioning, navigation and time for China and the neighboring areas before the end of this year, according to the authorities." The system became operational in the China region that same month. The global navigation system should be finished by 2020. As of December 2012, 16 satellites for BeiDou-2 have been launched, 14 of them are in service.

How many satellites have been launched as of November, 2013?
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A: unanswerable


Problem: The first issue was ammunition. Before the war it was recognised that ammunition needed to explode in the air. Both high explosive (HE) and shrapnel were used, mostly the former. Airburst fuses were either igniferious (based on a burning fuse) or mechanical (clockwork). Igniferious fuses were not well suited for anti-aircraft use. The fuse length was determined by time of flight, but the burning rate of the gunpowder was affected by altitude. The British pom-poms had only contact-fused ammunition. Zeppelins, being hydrogen filled balloons, were targets for incendiary shells and the British introduced these with airburst fuses, both shrapnel type-forward projection of incendiary 'pot' and base ejection of an incendiary stream. The British also fitted tracers to their shells for use at night. Smoke shells were also available for some AA guns, these bursts were used as targets during training.
In addition to high explosive, what else was used?
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Answer: shrapnel


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Early followers of Whitehead were found primarily at the University of Chicago's Divinity School, where Henry Nelson Wieman initiated an interest in Whitehead's work that would last for about thirty years. Professors such as Wieman, Charles Hartshorne, Bernard Loomer, Bernard Meland, and Daniel Day Williams made Whitehead's philosophy arguably the most important intellectual thread running through the Divinity School. They taught generations of Whitehead scholars, the most notable of which is John B. Cobb, Jr.
Where were the first followers mainly found?
A: at the University of Chicago's Divinity School


Context and question: The city also has several smaller music venues, including the Brook, The Talking Heads, The Soul Cellar, The Joiners and Turner Sims, as well as smaller "club circuit" venues like Hampton's and Lennon's, and a number of public houses including the Platform tavern, the Dolphin, the Blue Keys and many others. The Joiners has played host to such acts as Oasis, Radiohead, Green Day, Suede, PJ Harvey, the Manic Street Preachers, Coldplay, the Verve, the Libertines and Franz Ferdinand, while Hampton's and Lennon's have hosted early appearances by Kate Nash, Scouting for Girls and Band of Skulls. The nightclub, Junk, has been nominated for the UK's best small nightclub, and plays host to a range of dance music's top acts.
What genre of music is featured at Junk?
Answer: dance


Question: The simplest way to gain information about brain anatomy is by visual inspection, but many more sophisticated techniques have been developed. Brain tissue in its natural state is too soft to work with, but it can be hardened by immersion in alcohol or other fixatives, and then sliced apart for examination of the interior. Visually, the interior of the brain consists of areas of so-called grey matter, with a dark color, separated by areas of white matter, with a lighter color. Further information can be gained by staining slices of brain tissue with a variety of chemicals that bring out areas where specific types of molecules are present in high concentrations. It is also possible to examine the microstructure of brain tissue using a microscope, and to trace the pattern of connections from one brain area to another.
Is there an answer to this question: Brain tissue is naturally soft, but can be stiffened with what liquid?

Answer: alcohol


Problem: A cappella:

While worship in the Temple in Jerusalem included musical instruments (2 Chronicles 29:25–27), traditional Jewish religious services in the Synagogue, both before and after the last destruction of the Temple, did not include musical instruments given the practice of scriptural cantillation. The use of musical instruments is traditionally forbidden on the Sabbath out of concern that players would be tempted to repair (or tune) their instruments, which is forbidden on those days. (This prohibition has been relaxed in many Reform and some Conservative congregations.) Similarly, when Jewish families and larger groups sing traditional Sabbath songs known as zemirot outside the context of formal religious services, they usually do so a cappella, and Bar and Bat Mitzvah celebrations on the Sabbath sometimes feature entertainment by a cappella ensembles. During the Three Weeks musical instruments are prohibited. Many Jews consider a portion of the 49-day period of the counting of the omer between Passover and Shavuot to be a time of semi-mourning and instrumental music is not allowed during that time. This has led to a tradition of a cappella singing sometimes known as sefirah music.

What is forbidden on the Sabbath because it was considered work?
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A:
unanswerable