Problem: Adult contemporary music:

The early 1990s marked the softening of urban R&B at the same time alternative rock emerged and traditional pop saw a significant resurgence. This in part led to a widening of the market, not only allowing to cater to more niche markets, but it also became customary for artists to make AC-friendly singles.

The resurgence of traditional pop was one of the factors that led to what change in the music market?
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A: widening of the market


Problem: Everton hold the record for the most seasons in England's top tier (Division One/Premier League), at 111 seasons out of 114 as of 2014–15 (the club played in Division 2 in 1930–31 and from 1951–54). They are one of seven teams to have played all 22 seasons of the Premier League since its inception in August 1992 – the others being Arsenal, Aston Villa, Chelsea, Liverpool, Manchester United, and Tottenham Hotspur. Everton against Aston Villa is the most played fixture in England's top flight, as of the 2012–13 season the two founder members of the Football League have played a record 196 league games.
How many other teams have played all 22 seasons in the Premier League since its inception?
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Answer: seven


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Two assumptions underpinned the British approach to HAA fire; first, aimed fire was the primary method and this was enabled by predicting gun data from visually tracking the target and having its height. Second, that the target would maintain a steady course, speed and height. This HAA was to engage targets up to 24,000 feet. Mechanical, as opposed to igniferous, time fuses were required because the speed of powder burning varied with height so fuse length was not a simple function of time of flight. Automated fire ensured a constant rate of fire that made it easier to predict where each shell should be individually aimed.
What kind of fuses were needed?
A: Mechanical


Context and question: The first Digimon anime introduced the Digimon life cycle: They age in a similar fashion to real organisms, but do not die under normal circumstances because they are made of reconfigurable data, which can be seen throughout the show. Any Digimon that receives a fatal wound will dissolve into infinitesimal bits of data. The data then recomposes itself as a Digi-Egg, which will hatch when rubbed gently, and the Digimon goes through its life cycle again. Digimon who are reincarnated in this way will sometimes retain some or all their memories of their previous life. However, if a Digimon's data is completely destroyed, they will die.
What happens to a digimon after it dissolves?
Answer: goes through its life cycle again


Question: The hole walls for boards with two or more layers can be made conductive and then electroplated with copper to form plated-through holes.  These holes electrically connect the conducting layers of the PCB. For multi-layer boards, those with three layers or more, drilling typically produces a smear of the high temperature decomposition products of bonding agent in the laminate system. Before the holes can be plated through, this smear must be removed by a chemical de-smear process, or by plasma-etch. The de-smear process ensures that a good connection is made to the copper layers when the hole is plated through. On high reliability boards a process called etch-back is performed chemically with a potassium permanganate based etchant or plasma. The etch-back removes resin and the glass fibers so that the copper layers extend into the hole and as the hole is plated become integral with the deposited copper.
Is there an answer to this question: What's the minimum number of layers a PCB can have to be considered "multi-layer"?

Answer: three


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The alcohol in beer comes primarily from the metabolism of sugars that are produced during fermentation. The quantity of fermentable sugars in the wort and the variety of yeast used to ferment the wort are the primary factors that determine the amount of alcohol in the final beer. Additional fermentable sugars are sometimes added to increase alcohol content, and enzymes are often added to the wort for certain styles of beer (primarily "light" beers) to convert more complex carbohydrates (starches) to fermentable sugars. Alcohol is a by-product of yeast metabolism and is toxic to the yeast; typical brewing yeast cannot survive at alcohol concentrations above 12% by volume. Low temperatures and too little fermentation time decreases the effectiveness of yeasts and consequently decreases the alcohol content.
Where do the sugars in beer come from?
A:
unanswerable