Problem: Southampton:

At certain times of the year, The Queen Mary 2, Queen Elizabeth and Queen Victoria may all visit Southampton at the same time, in an event commonly called 'Arrival of the Three Queens'.

Along with the Queen Mary 2 and Queen Victoria, which third ship must be present for the 'Arrival of the Three Queens'?
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A: Queen Elizabeth

Problem: Some types of energy are a varying mix of both potential and kinetic energy. An example is mechanical energy which is the sum of (usually macroscopic) kinetic and potential energy in a system. Elastic energy in materials is also dependent upon electrical potential energy (among atoms and molecules), as is chemical energy, which is stored and released from a reservoir of electrical potential energy between electrons, and the molecules or atomic nuclei that attract them.[need quotation to verify].The list is also not necessarily complete. Whenever physical scientists discover that a certain phenomenon appears to violate the law of energy conservation, new forms are typically added that account for the discrepancy.
Where is chemical energy stored and released?
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Answer: from a reservoir of electrical potential energy between electrons

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Total investment in renewable energy (including small hydro-electric projects) was $244 billion in 2012, down 12% from 2011 mainly due to dramatically lower solar prices and weakened US and EU markets. As a share of total investment in power plants, wind and solar PV grew from 14% in 2000 to over 60% in 2012. The top countries for investment in recent years were China, Germany, Spain, the United States, Italy, and Brazil. Renewable energy companies include BrightSource Energy, First Solar, Gamesa, GE Energy, Goldwind, Sinovel, Trina Solar, Vestas and Yingli.
What six were the bottom countries for investment in recent years?
A: unanswerable

Context and question: Certain staples of classical music are often used commercially (either in advertising or in movie soundtracks). In television commercials, several passages have become cliched, particularly the opening of Richard Strauss' Also sprach Zarathustra (made famous in the film 2001: A Space Odyssey) and the opening section "O Fortuna" of Carl Orff's Carmina Burana, often used in the horror genre; other examples include the Dies Irae from the Verdi Requiem, Edvard Grieg's In the Hall of the Mountain King from Peer Gynt, the opening bars of Beethoven's Symphony No. 5, Wagner's Ride of the Valkyries from Die Walkure, Rimsky-Korsakov's Flight of the Bumblebee, and excerpts of Aaron Copland's Rodeo.
Who wrote in the Hall of the Mountain King?
Answer: Edvard Grieg

Question: In 2005, in order to host The 10th National Game of People's Republic of China, there was a new stadium, Nanjing Olympic Sports Center, constructed in Nanjing. Compared to Wutaishan Sports Center, which the major stadium's capacity is 18,500, Nanjing Olympic Sports Center has a more advanced stadium which is big enough to seat 60,000 spectators. Its gymnasium has capacity of 13,000, and natatorium of capacity 3,000.
Is there an answer to this question: How many people can Nanjing Olympic Sports Center's gymnasium hold?

Answer: 13,000

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
As a result of the now near-universal human reliance upon agriculture, the few contemporary hunter-gatherer cultures usually live in areas unsuitable for agricultural use.
Ancient hunter-gatherer cultures lived where?
A:
unanswerable