Problem: Anti-aircraft warfare:

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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A: shrapnel

Problem: Due to a complete estrangement between the two as a result of campaigning, Truman and Eisenhower had minimal discussions about the transition of administrations. After selecting his budget director, Joseph M. Dodge, Eisenhower asked Herbert Brownell and Lucius Clay to make recommendations for his cabinet appointments. He accepted their recommendations without exception; they included John Foster Dulles and George M. Humphrey with whom he developed his closest relationships, and one woman, Oveta Culp Hobby. Eisenhower's cabinet, consisting of several corporate executives and one labor leader, was dubbed by one journalist, "Eight millionaires and a plumber." The cabinet was notable for its lack of personal friends, office seekers, or experienced government administrators. He also upgraded the role of the National Security Council in planning all phases of the Cold War.
What woman was a member of Eisenhower's cabinet?
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Answer: Oveta Culp Hobby

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The field of neuroscience encompasses all approaches that seek to understand the brain and the rest of the nervous system. Psychology seeks to understand mind and behavior, and neurology is the medical discipline that diagnoses and treats diseases of the nervous system. The brain is also the most important organ studied in psychiatry, the branch of medicine that works to study, prevent, and treat mental disorders. Cognitive science seeks to unify neuroscience and psychology with other fields that concern themselves with the brain, such as computer science (artificial intelligence and similar fields) and philosophy.
What field of science studies the brain and the central nervous system?
A: neuroscience

Context and question: The Japanese defenders recognized the possibility of a renewed invasion, and began construction of a great stone barrier around Hakata Bay in 1276. Completed in 1277, this wall stretched for 20 kilometers around the border of the bay. This would later serve as a strong defensive point against the Mongols. The Mongols attempted to settle matters in a diplomatic way from 1275 to 1279, but every envoy sent to Japan was executed. This set the stage for one of the most famous engagements in Japanese history.
When did Japan begin building the Hakata Bay barrier?
Answer: 1276

Question: The cheerful crowds visiting bomb sites were so large they interfered with rescue work, pub visits increased in number (beer was never rationed), and 13,000 attended cricket at Lord's. People left shelters when told instead of refusing to leave, although many housewives reportedly enjoyed the break from housework. Some people even told government surveyors that they enjoyed air raids if they occurred occasionally, perhaps once a week. Despite the attacks, defeat in Norway and France, and the threat of invasion, overall morale remained high; a Gallup poll found only 3% of Britons expected to lose the war in May 1940, another found an 88% approval rating for Churchill in July, and a third found 89% support for his leadership in October. Support for peace negotiations declined from 29% in February. Each setback caused more civilians to volunteer to become unpaid Local Defence Volunteers, workers worked longer shifts and over weekends, contributions rose to the 5,000 "Spitfire Funds" to build fighters, and the number of work days lost to strikes in 1940 was the lowest in history.:6063,6768,75,7879,215216
Is there an answer to this question: What was Churchill's highest rating?

Answer: 89%

Question: Greater London's population declined steadily in the decades after the Second World War, from an estimated peak of 8.6 million in 1939 to around 6.8 million in the 1980s. The principal ports for London moved downstream to Felixstowe and Tilbury, with the London Docklands area becoming a focus for regeneration, including the Canary Wharf development. This was borne out of London's ever-increasing role as a major international financial centre during the 1980s. The Thames Barrier was completed in the 1980s to protect London against tidal surges from the North Sea.
Is there an answer to this question: What event preceded a substantial decrease in the average population in London?

Answer:
the Second World War