Problem: Korean War:

In the last two weeks of February 1951, Operation Roundup was followed by Operation Killer, carried out by the revitalized Eighth Army. It was a full-scale, battlefront-length attack staged for maximum exploitation of firepower to kill as many KPA and PVA troops as possible. Operation Killer concluded with I Corps re-occupying the territory south of the Han River, and IX Corps capturing Hoengseong. On 7 March 1951, the Eighth Army attacked with Operation Ripper, expelling the PVA and the KPA from Seoul on 14 March 1951. This was the city's fourth conquest in a years' time, leaving it a ruin; the 1.5 million pre-war population was down to 200,000, and people were suffering from severe food shortages.

What signified the end of Operation Killer?
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A: capturing Hoengseong


Problem: Prajñā (Sanskrit) or paññā (Pāli) means wisdom that is based on a realization of dependent origination, The Four Noble Truths and the three marks of existence. Prajñā is the wisdom that is able to extinguish afflictions and bring about bodhi. It is spoken of as the principal means of attaining nirvāṇa, through its revelation of the true nature of all things as dukkha (unsatisfactoriness), anicca (impermanence) and anatta (not-self). Prajñā is also listed as the sixth of the six pāramitās of the Mahayana.
Prajna is the wisom that is able to extinguish afflictions and bring about what?
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Answer: bodhi


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
An investigation by ProPublica found that at least 21 doctors have been paid more than $500,000 for speeches and consulting by drugs manufacturers since 2009, with half of the top earners working in psychiatry, and about $2 billion in total paid to doctors for such services. AstraZeneca, Johnson & Johnson and Eli Lilly have paid billions of dollars in federal settlements over allegations that they paid doctors to promote drugs for unapproved uses. Some prominent medical schools have since tightened rules on faculty acceptance of such payments by drug companies.
Billions of dollars have been paid by which companies?
A: AstraZeneca, Johnson & Johnson and Eli Lilly


Context and question: Tom Robinson is the chief example among several innocents destroyed carelessly or deliberately throughout the novel. However, scholar Christopher Metress connects the mockingbird to Boo Radley: "Instead of wanting to exploit Boo for her own fun (as she does in the beginning of the novel by putting on gothic plays about his history), Scout comes to see him as a 'mockingbird'—that is, as someone with an inner goodness that must be cherished." The last pages of the book illustrate this as Scout relates the moral of a story Atticus has been reading to her, and in allusions to both Boo Radley and Tom Robinson states about a character who was misunderstood, "when they finally saw him, why he hadn't done any of those things ... Atticus, he was real nice," to which he responds, "Most people are, Scout, when you finally see them."
According to Atticus, most people are how when you truly view them?
Answer: real nice


Question: In accordance with tradition, they sign by placing the title "Cardinal" (abbreviated Card.) after their personal name and before their surname as, for instance, "John Card(inal) Doe" or, in Latin, "Ioannes Card(inalis) Cognomen". Some writers, such as James-Charles Noonan, hold that, in the case of cardinals, the form used for signatures should be used also when referring to them in English. Official sources such as the Archdiocese of Milwaukee and Catholic News Service say that the correct form for referring to a cardinal in English is normally as "Cardinal [First name] [Surname]". This is the rule given also in stylebooks not associated with the Catholic Church. This style is also generally followed on the websites of the Holy See and episcopal conferences. Oriental Patriarchs who are created Cardinals customarily use "Sanctae Ecclesiae Cardinalis" as their full title, probably because they do not belong to the Roman clergy.
Is there an answer to this question: What is not the correct way to address a cardinal according to the Archdiocese of Milwaukee?

Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Commercial solar water heaters began appearing in the United States in the 1890s. These systems saw increasing use until the 1920s but were gradually replaced by cheaper and more reliable heating fuels. As with photovoltaics, solar water heating attracted renewed attention as a result of the oil crises in the 1970s but interest subsided in the 1980s due to falling petroleum prices. Development in the solar water heating sector progressed steadily throughout the 1990s and growth rates have averaged 20% per year since 1999. Although generally underestimated, solar water heating and cooling is by far the most widely deployed solar technology with an estimated capacity of 154 GW as of 2007.
When did the use of solar water heaters in the US first begin?
A:
in the 1890s