Problem: Raleigh, North Carolina:

During the difficult 1930s of the Great Depression, government at all levels was integral to creating jobs. The city provided recreational and educational programs, and hired people for public works projects. In 1932, Raleigh Memorial Auditorium was dedicated. The North Carolina Symphony, founded the same year, performed in its new home. From 1934 to 1937, the federal Civilian Conservation Corps constructed the area now known as William B. Umstead State Park. In 1939, the State General Assembly chartered the Raleigh-Durham Aeronautical Authority to build a larger airport between Raleigh and Durham, with the first flight occurring in 1943.

When did the last flight leave the Raleigh-Durham airport?
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A: unanswerable

Problem: In 1260, control passed to the Mamluk sultans of Egypt. The country was located between the two centres of Mamluk power, Cairo and Damascus, and only saw some development along the postal road connecting the two cities. Jerusalem, although left without the protection of any city walls since 1219, also saw a flurry of new construction projects centred around the Al-Aqsa Mosque compound (the Temple Mount). In 1266 the Mamluk Sultan Baybars converted the Cave of the Patriarchs in Hebron into an exclusive Islamic sanctuary and banned Christians and Jews from entering, which previously would be able to enter it for a fee. The ban remained in place until Israel took control of the building in 1967.
When did the Mamluk Sultan Baybars convert to the Cave of Patriarchs?
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Answer: 1266

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Sichuan came under the firm control of a Chinese central government during the Sui dynasty, but it was during the subsequent Tang dynasty where Sichuan regained its previous political and cultural prominence for which it was known during the Han. Chengdu became nationally known as a supplier of armies and the home of Du Fu, who is sometimes called China's greatest poet. During the An Lushan Rebellion (755-763), Emperor Xuanzong of Tang fled from Chang'an to Sichuan. The region was torn by constant warfare and economic distress as it was besieged by the Tibetan Empire.
Which empire ravished the Chengdu region with constant warfare and economic distress?
A: the Tibetan Empire

Context and question: John grew up to be around 5 ft 5 in (1.68 m) tall, relatively short, with a "powerful, barrel-chested body" and dark red hair; he looked to contemporaries like an inhabitant of Poitou. John enjoyed reading and, unusually for the period, built up a travelling library of books. He enjoyed gambling, in particular at backgammon, and was an enthusiastic hunter, even by medieval standards. He liked music, although not songs. John would become a "connoisseur of jewels", building up a large collection, and became famous for his opulent clothes and also, according to French chroniclers, for his fondness for bad wine. As John grew up, he became known for sometimes being "genial, witty, generous and hospitable"; at other moments, he could be jealous, over-sensitive and prone to fits of rage, "biting and gnawing his fingers" in anger.[nb 3]
What did John do in fits of rage?
Answer: biting and gnawing his fingers

Question: Bell's own home used a primitive form of air conditioning, in which fans blew currents of air across great blocks of ice. He also anticipated modern concerns with fuel shortages and industrial pollution. Methane gas, he reasoned, could be produced from the waste of farms and factories. At his Canadian estate in Nova Scotia, he experimented with composting toilets and devices to capture water from the atmosphere. In a magazine interview published shortly before his death, he reflected on the possibility of using solar panels to heat houses.
Is there an answer to this question: What form of water played a part in Bell's home cooling system?

Answer: ice

QUES: In an influential 1988 paper, Timothy Rowe defined Mammalia phylogenetically as the crown group mammals, the clade consisting of the most recent common ancestor of living monotremes (echidnas and platypuses) and therian mammals (marsupials and placentals) and all descendants of that ancestor. Since this ancestor lived in the Jurassic period, Rowe's definition excludes all animals from the earlier Triassic, despite the fact that Triassic fossils in the Haramiyida have been referred to the Mammalia since the mid-19th century.

In what period did mammals live?
What is the answer?
ANS:
unanswerable