Problem: Glass:

Glass was used extensively during the Middle Ages. Anglo-Saxon glass has been found across England during archaeological excavations of both settlement and cemetery sites. Glass in the Anglo-Saxon period was used in the manufacture of a range of objects including vessels, beads, windows and was also used in jewelry. From the 10th-century onwards, glass was employed in stained glass windows of churches and cathedrals, with famous examples at Chartres Cathedral and the Basilica of Saint Denis. By the 14th-century, architects were designing buildings with walls of stained glass such as Sainte-Chapelle, Paris, (1203–1248) and the East end of Gloucester Cathedral. Stained glass had a major revival with Gothic Revival architecture in the 19th-century. With the Renaissance, and a change in architectural style, the use of large stained glass windows became less prevalent. The use of domestic stained glass increased until most substantial houses had glass windows. These were initially small panes leaded together, but with the changes in technology, glass could be manufactured relatively cheaply in increasingly larger sheets. This led to larger window panes, and, in the 20th-century, to much larger windows in ordinary domestic and commercial buildings.

When did stained glass make a big comeback?
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A: 19th-century


Problem: Between the German invasion of Poland on 1 September 1939 and the Anglo-French declaration of War against the German Reich on 3 September 1939, the entire city (a total of 120,000 people) was evacuated, like other border towns as well. Until the arrival of the Wehrmacht troops mid-June 1940, the city was, for ten months, completely empty, with the exception of the garrisoned soldiers. The Jews of Strasbourg had been evacuated to Périgueux and Limoges, the University had been evacuated to Clermont-Ferrand.
On what date were the Jews of Strasbourg evacuated?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Banking services are provided by the National Bank of Tuvalu. Public sector workers make up about 65% of those formally employed. Remittances from Tuvaluans living in Australia and New Zealand, and remittances from Tuvaluan sailors employed on overseas ships are important sources of income for Tuvaluans. Approximately 15% of adult males work as seamen on foreign-flagged merchant ships. Agriculture in Tuvalu is focused on coconut trees and growing pulaka in large pits of composted soil below the water table. Tuvaluans are otherwise involved in traditional subsistence agriculture and fishing.
How do 15% of male Tuvaluans earn their income?
A: seamen


Context and question: Episcopalians and Presbyterians, as well as other WASPs, tend to be considerably wealthier and better educated (having graduate and post-graduate degrees per capita) than most other religious groups in United States, and are disproportionately represented in the upper reaches of American business, law and politics, especially the Republican Party. Numbers of the most wealthy and affluent American families as the Vanderbilts and the Astors, Rockefeller, Du Pont, Roosevelt, Forbes, Whitneys, the Morgans and Harrimans are Mainline Protestant families.
Other than politics, what areas have a disproportionately large number of Protestants?
Answer: American business, law


Question: Often compared to San Francisco due to the hilly terrain and steep maze of residential streets, housing in St. John's is typically painted in bright colours. The city council has implemented strict heritage regulations in the downtown area, including restrictions on the height of buildings. These regulations have caused much controversy over the years. With the city experiencing an economic boom a lack of hotel rooms and office space has seen proposals put forward that do not meet the current height regulations. Heritage advocates argue that the current regulations should be enforced while others believe the regulations should be relaxed to encourage economic development.
Is there an answer to this question: What does the city council have restrictions on in downtown?

Answer: height of buildings


Sunlight is also captured by plants as chemical potential energy in photosynthesis, when carbon dioxide and water (two low-energy compounds) are converted into the high-energy compounds carbohydrates, lipids, and proteins. Plants also release oxygen during photosynthesis, which is utilized by living organisms as an electron acceptor, to release the energy of carbohydrates, lipids, and proteins. Release of the energy stored during photosynthesis as heat or light may be triggered suddenly by a spark, in a forest fire, or it may be made available more slowly for animal or human metabolism, when these molecules are ingested, and catabolism is triggered by enzyme action.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What do plants retain? during photosynthesis?
Ah, so..
unanswerable