Problem: BeiDou Navigation Satellite System:

On July 25, 2015, the 18th and 19th satellites were successfully launched from the Xichang Satellite Launch Center, marking the first time for China to launch two satellites at once on top of a Long March 3B/Expedition-1 carrier rocket. The Expedition-1 is an independent upper stage capable of delivering one or more spacecraft into different orbits.

In which year was the 20th satellite launched?
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A: unanswerable


Problem: During the early years of the Cold War from 1946 to 1958, the United States tested 67 nuclear weapons at its Pacific Proving Grounds located in the Marshall Islands, including the largest atmospheric nuclear test ever conducted by the U.S., code named Castle Bravo. "The bombs had a total yield of 108,496 kilotons, over 7,200 times more powerful than the atomic weapons used during World War II." With the 1952 test of the first U.S. hydrogen bomb, code named "Ivy Mike," the island of Elugelab in the Enewetak atoll was destroyed. In 1956, the United States Atomic Energy Commission regarded the Marshall Islands as "by far the most contaminated place in the world."
What was the yield of the Castle Bravo bombs in kilotons?
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Answer: 108,496


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
After the success of quantum electrodynamics, Feynman turned to quantum gravity. By analogy with the photon, which has spin 1, he investigated the consequences of a free massless spin 2 field, and derived the Einstein field equation of general relativity, but little more. The computational device that Feynman discovered then for gravity, "ghosts", which are "particles" in the interior of his diagrams that have the "wrong" connection between spin and statistics, have proved invaluable in explaining the quantum particle behavior of the Yang–Mills theories, for example, QCD and the electro-weak theory.
Where did  Feynman find success before moving to quantum gravity
A: quantum electrodynamics


Context and question: By 1937, Japan controlled Manchuria and was ready to move deeper into China. The Marco Polo Bridge Incident on 7 July 1937 provoked full-scale war between China and Japan. The Nationalist and Communist Chinese suspended their civil war to form a nominal alliance against Japan, and the Soviet Union quickly lent support by providing large amount of materiel to Chinese troops. In August 1937, Generalissimo Chiang Kai-shek deployed his best army to fight about 300,000 Japanese troops in Shanghai, but, after three months of fighting, Shanghai fell. The Japanese continued to push the Chinese forces back, capturing the capital Nanking in December 1937 and committed which was known as Nanking Massacre. In March 1938, Nationalist forces won their first victory at Taierzhuang. but then the city of Xuzhou was taken by Japanese in May. In June 1938, Japan deployed about 350,000 troops to invade Wuhan and captured it in October. The Japanese achieved major military victories, but world opinion—in particular in the United States—condemned Japan, especially after the Panay Incident.
Who supplied assistance to the Chinese military?
Answer: Soviet Union


Question: The Scheinergrade (Sch.) system was devised by the German astronomer Julius Scheiner (1858–1913) in 1894 originally as a method of comparing the speeds of plates used for astronomical photography. Scheiner's system rated the speed of a plate by the least exposure to produce a visible darkening upon development. Speed was expressed in degrees Scheiner, originally ranging from 1° Sch. to 20° Sch., where an increment of 19° Sch. corresponded to a hundredfold increase in sensitivity, which meant that an increment of 3° Sch. came close to a doubling of sensitivity.
Is there an answer to this question: When did the Scheinergrade system become outdated?

Answer: unanswerable


QUES: T. Gilmartin, (Professor of History, Maynooth, 1890), writes in Church History, Vol. 1, Ch XVII: The Arians sought the approval of an Ecumenical Council. They sought to hold two councils. Constantius, summoned the bishops of the East to meet at Seleucia in Isauria, and those of the West to Rimini in Italy. A preliminary conference was held by the Arians at Sirmium, to agree a formula of faith. A "Homoeon" creed was adopted, declaring The Son to be "like the Father". The two met in autumn of 359. At Seleucia, one hundred and fifty bishops, of which one hundred and five were semi-Arian. The semi-Arians refused to accept anything less than the "Homoiousion", (see: Homoiousian), formulary of faith. The Imperial Prefect was obliged to disband, without agreeing on any creed. Acacius, the leader of the "Homoean" party went to Constantinople, where the Sirmian formulary of faith was approved by the "Home Synod", (consisted of those bishops who happened to be present at the Court for the time), and a decree of deposition issued against the leaders of the semi-Arians. At Rimini were over four hundred of which eighty were Arian, the rest were orthodox. The orthodox fathers refused to accept any creed but the Nicene, while the others were equally in favour of the Sirmian. Each party sent a deputation to the Emperor to say there was no probability to agreement, and asked for the bishops to return to their dioceses. For the purpose of wearing-down the orthodox bishops; (Sulpitius Severius says), Constantius delayed his answer for several months, and finally prevailed on them to accept the Sirmian creed. It was after this Council that Jerome said: " ...the whole world groaned in astonishment to find itself Arian."

 What was the belief that was disproved at this council?
What is the answer?
ANS:
unanswerable