Problem: Friedrich Hayek:

Some socialists such as H. D. Dickinson and Oskar Lange, responded by invoking general equilibrium theory, which they argued disproved Mises's thesis. They noted that the difference between a planned and a free market system lay in who was responsible for solving the equations. They argued, if some of the prices chosen by socialist managers were wrong, gluts or shortages would appear, signalling them to adjust the prices up or down, just as in a free market. Through such a trial and error, a socialist economy could mimic the efficiency of a free market system, while avoiding its many problems.

What did socialists believe equilibrium theory invalidated?
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A: Mises's thesis


Problem: The major soap operas on British television each feature a pub, and these pubs have become household names. The Rovers Return is the pub in Coronation Street, the British soap broadcast on ITV. The Queen Vic (short for the Queen Victoria) is the pub in EastEnders, the major soap on BBC One and the Woolpack in ITV's Emmerdale. The sets of each of the three major television soap operas have been visited by some of the members of the royal family, including Queen Elizabeth II. The centrepiece of each visit was a trip into the Rovers, the Queen Vic, or the Woolpack to be offered a drink. The Bull in the BBC Radio 4 soap opera The Archers is an important meeting point.
What pub is featured on Emmerdale?
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Answer: the Woolpack


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Solar hot water systems use sunlight to heat water. In low geographical latitudes (below 40 degrees) from 60 to 70% of the domestic hot water use with temperatures up to 60 °C can be provided by solar heating systems. The most common types of solar water heaters are evacuated tube collectors (44%) and glazed flat plate collectors (34%) generally used for domestic hot water; and unglazed plastic collectors (21%) used mainly to heat swimming pools.
What do Solar hot water systems use to heat water?
A: sunlight


Context and question: Many beers are sold in cans, though there is considerable variation in the proportion between different countries. In Sweden in 2001, 63.9% of beer was sold in cans. People either drink from the can or pour the beer into a glass. A technology developed by Crown Holdings for the 2010 FIFA World Cup is the 'full aperture' can, so named because the entire lid is removed during the opening process, turning the can into a drinking cup. Cans protect the beer from light (thereby preventing "skunked" beer) and have a seal less prone to leaking over time than bottles. Cans were initially viewed as a technological breakthrough for maintaining the quality of a beer, then became commonly associated with less expensive, mass-produced beers, even though the quality of storage in cans is much like bottles. Plastic (PET) bottles are used by some breweries.
How much beer was sold in cans in Sweden during the year 2010?
Answer: unanswerable


Question: The presence of pain in an animal cannot be known for certain, but it can be inferred through physical and behavioral reactions. Specialists currently believe that all vertebrates can feel pain, and that certain invertebrates, like the octopus, might too. As for other animals, plants, or other entities, their ability to feel physical pain is at present a question beyond scientific reach, since no mechanism is known by which they could have such a feeling. In particular, there are no known nociceptors in groups such as plants, fungi, and most insects, except for instance in fruit flies.
Is there an answer to this question: What about pain in an animal isn't able to be known with certainty?

Answer: presence


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
There are also open compression formats like Opus and Vorbis that are available free of charge and without any known patent restrictions. Some of the newer audio compression formats, such as AAC, WMA Pro and Vorbis, are free of some limitations inherent to the MP3 format that cannot be overcome by any MP3 encoder.
Being open formats means that Opus and Vorbis can be used without what?
A:
any known patent restrictions