Problem: Sahara:

The permanent dissolution of clouds allows unhindered light and thermal radiation. The stability of the atmosphere above the desert prevents any convective overturning, thus making rainfall virtually non-existent. As a consequence, the weather tends to be sunny, dry and stable with a minimal risk of rainfall. Subsiding, diverging, dry air masses associated with subtropical high-pressure systems are extremely unfavorable for the development of convectional showers. The subtropical ridge is the predominate factor that explains the hot desert climate (Köppen climate classification BWh) of this vast region. The lowering of air is the strongest and the most effective over the eastern part of the Great Desert, in the Libyan Desert which is the sunniest, the driest and the most nearly rainless place on the planet rivaling the Atacama Desert, lying in Chile and Peru.

Where is the air the strongest?
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A: eastern part of the Great Desert


Problem: Railways must operate at variable speeds. Until the mid 1980s this was only practical with the brush-type DC motor, although such DC can be supplied from an AC catenary via on-board electric power conversion. Since such conversion was not well developed in the late 19th century and early 20th century, most early electrified railways used DC and many still do, particularly rapid transit (subways) and trams. Speed was controlled by connecting the traction motors in various series-parallel combinations, by varying the traction motors' fields, and by inserting and removing starting resistances to limit motor current.
Speed was controlled by disconnecting the traction motors where?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Some titles have a Biblical basis, for instance the title Queen Mother has been given to Mary since she was the mother of Jesus, who was sometimes referred to as the "King of Kings" due to his lineage of King David. The biblical basis for the term Queen can be seen in the Gospel of Luke 1:32 and the Book of Isaiah 9:6, and Queen Mother from 1 Kings 2:19-20 and Jeremiah 13:18-19. Other titles have arisen from reported miracles, special appeals or occasions for calling on Mary, e.g., Our Lady of Good Counsel, Our Lady of Navigators or Our Lady of Ransom who protects captives.
Jesus was known as the "King of Kings" because of his lieage from who?
A: King David


Context and question: The FA permitted artificial turf (3G) pitches in all rounds of the competition from the 2014–15 edition and beyond. Under the 2015-16 rules, the pitch must be of FIFA One Star quality, or Two Star for ties if they involve one of the 92 professional clubs. This followed approval two years previously for their use in the qualifying rounds only - if a team with a 3G pitch progressed to the competition proper, they had to switch their tie to the ground of another eligible entrant with a natural grass pitch. Having been strong proponents of the surface, the first match in the proper rounds to be played on a 3G surface was a televised first round replay at Maidstone United's Gallagher Stadium on 20 November 2015.
What happens if a team with a 3G pitch does not progress to the competition proper?
Answer: unanswerable


Question: Season 12 premiered on January 16, 2013. Judges Jennifer Lopez and Steven Tyler left the show after two seasons. This season's judging panel consisted of Randy Jackson, along with Mariah Carey, Keith Urban and Nicki Minaj. This was the first season since season nine to have four judges on the panel. The pre-season buzz and the early episodes of the show were dominated by the feud between the judges Minaj and Carey after a video of their dispute was leaked to TMZ.
Is there an answer to this question: How many judges did this season have?

Answer: four


QUES: On November 6, 2013, Google implemented a new comment system that requires all YouTube users to use a Google+ account in order to comment on videos and making the comment system Google+ oriented. The changes are in large part an attempt to address the frequent criticisms of the quality and tone of YouTube comments. They give creators more power to moderate and block comments, and add new sorting mechanisms to ensure that better, more relevant discussions appear at the top. The new system restored the ability to include URLs in comments, which had previously been removed due to problems with abuse. In response, YouTube co-founder Jawed Karim posted the question "why the fuck do I need a google+ account to comment on a video?" on his YouTube channel to express his negative opinion of the change. The official YouTube announcement received 20,097 "thumbs down" votes and generated more than 32,000 comments in two days. Writing in the Newsday blog Silicon Island, Chase Melvin noted that "Google+ is nowhere near as popular a social media network as Facebook, but it's essentially being forced upon millions of YouTube users who don't want to lose their ability to comment on videos" and "Discussion forums across the Internet are already bursting with outcry against the new comment system". In the same article Melvin goes on to say:

There were better sorting functions put in place in 2013 to make sure what kind of comments appeared on top?
What is the answer?
ANS:
more relevant discussions