Problem: Police:

Unmarked vehicles are used primarily for sting operations or apprehending criminals without alerting them to their presence. Some police forces use unmarked or minimally marked cars for traffic law enforcement, since drivers slow down at the sight of marked police vehicles and unmarked vehicles make it easier for officers to catch speeders and traffic violators. This practice is controversial, with for example, New York State banning this practice in 1996 on the grounds that it endangered motorists who might be pulled over by people impersonating police officers.

What use of unmarked cars isn't controversial?
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A: unanswerable

Problem: The record attendance for an Everton home match is 78,299 against Liverpool on 18 September 1948. Amazingly, there was only 1 injury at this game-Tom Fleetwood was hit on the head by a coin thrown from the crowd whilst he marched around the perimeter with St Edward's Orphanage Band, playing the cornet. Goodison Park, like all major English football grounds since the recommendations of the Taylor Report were implemented, is now an all-seater and only holds just under 40,000, meaning it is unlikely that this attendance record will ever be broken at Goodison. Everton's record transfer paid was to Chelsea for Belgian forward Romelu Lukaku for a sum of 28m. Everton bought the player after he played the previous year with the team on loan.
Who was injured during Everton's record attendance match against Liverpool in 1948?
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Answer: Tom Fleetwood

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The "Safe Harbor" agreement is a voluntary agreement between the private landowner and FWS. The landowner agrees to alter the property to benefit or even attract a listed or proposed species in exchange for assurances that the FWS will permit future "takes" above a pre-determined level. The policy relies on the "enhancement of survival" provision of Section 1539(a)(1)(A). A landowner can have either a "Safe Harbor" agreement or an Incidental Take Permit, or both. The policy was developed by the Clinton Administration in 1999.
What provision is the ITP under?
A: unanswerable

Context and question: Early humanists saw no conflict between reason and their Christian faith (see Christian Humanism). They inveighed against the abuses of the Church, but not against the Church itself, much less against religion. For them, the word "secular" carried no connotations of disbelief that would come later, in the nineteenth century. In the Renaissance to be secular meant simply to be in the world rather than in a monastery. Petrarch frequently admitted that his brother Gherardo's life as a Carthusian monk was superior to his own (although Petrarch himself was in Minor Orders and was employed by the Church all his life). He hoped that he could do some good by winning earthly glory and praising virtue, inferior though that might be to a life devoted solely to prayer. By embracing a non-theistic philosophic base, however, the methods of the humanists, combined with their eloquence, would ultimately have a corrosive effect on established authority.
What time period did secular have an ultra-positive connotation?
Answer: unanswerable

Question: In contrast to this viewpoint, an article and associated editorial in the New England Journal of Medicine in May 2015 emphasized the importance of pharmaceutical industry-physician interactions for the development of novel treatments, and argued that moral outrage over industry malfeasance had unjustifiably led many to overemphasize the problems created by financial conflicts of interest. The article noted that major healthcare organizations such as National Center for Advancing Translational Sciences of the National Institutes of Health, the President's Council of Advisors on Science and Technology, the World Economic Forum, the Gates Foundation, the Wellcome Trust, and the Food and Drug Administration had encouraged greater interactions between physicians and industry in order to bring greater benefits to patients.
Is there an answer to this question: When did the article come out about the importance of doctors?

Answer: unanswerable

Meanwhile, Le Verrier by letter urged Berlin Observatory astronomer Johann Gottfried Galle to search with the observatory's refractor. Heinrich d'Arrest, a student at the observatory, suggested to Galle that they could compare a recently drawn chart of the sky in the region of Le Verrier's predicted location with the current sky to seek the displacement characteristic of a planet, as opposed to a fixed star. On the evening of 23 September 1846, the day Galle received the letter, he discovered Neptune within 1 of where Le Verrier had predicted it to be, about 12 from Adams' prediction. Challis later realised that he had observed the planet twice, on 4 and 12 August, but did not recognise it as a planet because he lacked an up-to-date star map and was distracted by his concurrent work on comet observations.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What was Challis looking for when he saw Neptune the first two times?
Ah, so..
comet observations