Problem: Red:

In nature, the red color of blood comes from hemoglobin, the iron-containing protein found in the red blood cells of all vertebrates. The red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide. It also causes the red color of the planet Mars. The red sky at sunset and sunrise is caused by an optical effect known as Rayleigh scattering, which, when the sun is low or below the horizon, increases the red-wavelength light that reaches the eye. The color of autumn leaves is caused by pigments called anthocyanins, which are produced towards the end of summer, when the green chlorophyll is no longer produced. One to two percent of the human population has red hair; the color is produced by high levels of the reddish pigment pheomelanin (which also accounts for the red color of the lips) and relatively low levels of the dark pigment eumelanin.

Why does a sky turn red when the evening comes?
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A: Rayleigh scattering

Problem: Like other historical languages, Old English has been used by scholars and enthusiasts of later periods to create texts either imitating Anglo-Saxon literature or deliberately transferring it to a different cultural context. Examples include Alistair Campbell and J. R. R. Tolkien. A number of websites devoted to Neo-Paganism and Historical re-enactment offer reference material and forums promoting the active use of Old English. By far the most ambitious project[peacock term] is the Old English Wikipedia, but most of the Neo-Old English texts published online bear little resemblance to the historical model and are riddled with very basic grammatical mistakes.
What Wikipedia project translate Old English texts?
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Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Actor Dominic West has been unenthusiastic about the career benefits of being an Old Etonian, saying it "is a stigma that is slightly above 'paedophile' in the media in a gallery of infamy", but asked whether he would consider sending his own children there, said "Yes, I would. It's an extraordinary place... It has the facilities and the excellence of teaching and it will find what you're good at and nurture it", while the actor Tom Hiddleston says there are widespread misconceptions about Eton, and that "People think it's just full of braying toffs... It isn't true... It's actually one of the most broadminded places I've ever been. The reason it's a good school is that it encourages people to find the thing they love and to go for it. They champion the talent of the individual and that's what's special about it".
What did Dominic West say about the perception of Eton being full of braying toffs?
A: unanswerable

Context and question: The driving force behind voluntary green electricity within the EU are the liberalized electricity markets and the RES Directive. According to the directive the EU Member States must ensure that the origin of electricity produced from renewables can be guaranteed and therefore a "guarantee of origin" must be issued (article 15). Environmental organisations are using the voluntary market to create new renewables and improving sustainability of the existing power production. In the US the main tool to track and stimulate voluntary actions is Green-e program managed by Center for Resource Solutions. In Europe the main voluntary tool used by the NGOs to promote sustainable electricity production is EKOenergy label.
What is the driving force behind voluntary green electricity outside of the EU?
Answer: unanswerable

Question: Greenware ceramics made from celadon had been made in the area since the 3rd-century Jin dynasty, but it returned to prominenceparticularly in Longquanduring the Southern Song and Yuan. Longquan greenware is characterized by a thick unctuous glaze of a particular bluish-green tint over an otherwise undecorated light-grey porcellaneous body that is delicately potted. Yuan Longquan celadons feature a thinner, greener glaze on increasingly large vessels with decoration and shapes derived from Middle Eastern ceramic and metalwares. These were produced in large quantities for the Chinese export trade to Southeast Asia, the Middle East, and (during the Ming) Europe. By the Ming, however, production was notably deficient in quality. It is in this period that the Longquan kilns declined, to be eventually replaced in popularity and ceramic production by the kilns of Jingdezhen in Jiangxi.
Is there an answer to this question: What were greenware ceramics made from?

Answer: celadon

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In Israel, the term Ashkenazi is now used in a manner unrelated to its original meaning, often applied to all Jews who settled in Europe and sometimes including those whose ethnic background is actually Sephardic. Jews of any non-Ashkenazi background, including Mizrahi, Yemenite, Kurdish and others who have no connection with the Iberian Peninsula, have similarly come to be lumped together as Sephardic. Jews of mixed background are increasingly common, partly because of intermarriage between Ashkenazi and non-Ashkenazi, and partly because many do not see such historic markers as relevant to their life experiences as Jews.
In Israel, the term Ashkenazi is now used to refer to whom?
A:
all Jews who settled in Europe and sometimes including those whose ethnic background is actually Sephardic