Problem: Dog:

Neutering refers to the sterilization of animals, usually by removal of the male's testicles or the female's ovaries and uterus, in order to eliminate the ability to procreate and reduce sex drive. Because of the overpopulation of dogs in some countries, many animal control agencies, such as the American Society for the Prevention of Cruelty to Animals (ASPCA), advise that dogs not intended for further breeding should be neutered, so that they do not have undesired puppies that may have to later be euthanized.

What is typically surgically removed on male dogs to prevent procreation?
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A: testicles


Problem: Santa Monica is one of the most environmentally activist municipalities in the nation. The city first proposed its Sustainable City Plan in 1992 and in 1994, was one of the first cities in the nation to formally adopt a comprehensive sustainability plan, setting waste reduction and water conservation policies for both public and private sector through its Office of Sustainability and the Environment. Eighty-two percent of the city's public works vehicles now run on alternative fuels, including nearly 100% of the municipal bus system, making it among the largest such fleets in the country. Santa Monica fleet vehicles and Buses now source their natural gas from Redeem, a Southern California-based supplier of renewable and sustainable natural gas obtained from non-fracked methane biogas generated from organic landfill waste.
How many city public works vehicles are there in total in Santa Monica?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The unemployment rate reached its peak of 20% in 2005. Since then, it has decreased to 7% in 2013, which is only slightly above the national average. The decrease is caused on the one hand by the emergence of new jobs and on the other by a marked decrease in the working-age population, caused by emigration and low birth rates for decades. The wages in Thuringia are low compared to rich bordering Lands like Hesse and Bavaria. Therefore, many Thuringians are working in other German Lands and even in Austria and Switzerland as weekly commuters. Nevertheless, the demographic transition in Thuringia leads to a lack of workers in some sectors. External immigration into Thuringia has been encouraged by the government since about 2010 to counter this problem.
What is the current state of employment in Thuringia?
A: unanswerable


Context and question: Modern biblical scholarship treats the account in the synoptic gospels as a literary creation by the author of the Mark Gospel, amended in the Luke and Matthew accounts, intended to heighten the importance of what they saw as a theologically significant event, and not intended to be taken literally. This image of darkness over the land would have been understood by ancient readers, a typical element in the description of the death of kings and other major figures by writers such as Philo, Dio Cassius, Virgil, Plutarch and Josephus. Géza Vermes describes the darkness account as typical of "Jewish eschatological imagery of the day of the Lord", and says that those interpreting it as a datable eclipse are "barking up the wrong tree".
What nationality was Dio Cassius?
Answer: unanswerable


Question: The avian circulatory system is driven by a four-chambered, myogenic heart contained in a fibrous pericardial sac. This pericardial sac is filled with a serous fluid for lubrication. The heart itself is divided into a right and left half, each with an atrium and ventricle. The atrium and ventricles of each side are separated by atrioventricular valves which prevent back flow from one chamber to the next during contraction. Being myogenic, the heart's pace is maintained by pacemaker cells found in the sinoatrial node, located on the right atrium. The sinoatrial node uses calcium to cause a depolarizing signal transduction pathway from the atrium through right and left atrioventricular bundle which communicates contraction to the ventricles. The avian heart also consists of muscular arches that are made up of thick bundles of muscular layers. Much like a mammalian heart, the avian heart is composed of endocardial, myocardial and epicardial layers. The atrium walls tend to be thinner than the ventricle walls, due to the intense ventricular contraction used to pump oxygenated blood throughout the body. Avian hearts are generally larger than mammalian hearts when compared to body mass. This adaptation allows more blood to be pumped to meet the high metabolic need associated with flight.
Is there an answer to this question: What lubricates the pericardial sac?

Answer: serous fluid


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Phonetically in some languages, such as Navajo, aspiration of stops tends to be realised as voiceless velar airflow; aspiration of affricates is realised as an extended length of the frication.
In Navajo, the aspiration of affricates can be seen as what?
A:
an extended length of the frication