Problem: John, King of England:

The character of John's relationship with his second wife, Isabella of Angouleme, is unclear. John married Isabella whilst she was relatively young her exact date of birth is uncertain, and estimates place her between at most 15 and more probably towards nine years old at the time of her marriage.[nb 15] Even by the standards of the time, Isabella was married whilst very young. John did not provide a great deal of money for his wife's household and did not pass on much of the revenue from her lands, to the extent that historian Nicholas Vincent has described him as being "downright mean" towards Isabella. Vincent concluded that the marriage was not a particularly "amicable" one. Other aspects of their marriage suggest a closer, more positive relationship. Chroniclers recorded that John had a "mad infatuation" with Isabella, and certainly John had conjugal relationships with Isabella between at least 1207 and 1215; they had five children. In contrast to Vincent, historian William Chester Jordan concludes that the pair were a "companionable couple" who had a successful marriage by the standards of the day.

When did John have conjugal relationships with Isabella?
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A: 1207 and 1215

Problem: At about the same time, the word "humanism" as a philosophy centred on humankind (as opposed to institutionalised religion) was also being used in Germany by the so-called Left Hegelians, Arnold Ruge, and Karl Marx, who were critical of the close involvement of the church in the repressive German government. There has been a persistent confusion between the several uses of the terms: philanthropic humanists look to what they consider their antecedents in critical thinking and human-centered philosophy among the Greek philosophers and the great figures of Renaissance history; and scholarly humanists stress the linguistic and cultural disciplines needed to understand and interpret these philosophers and artists.
Where did the learned believers place their focus?
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Answer: linguistic and cultural disciplines

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Many of the limitations of the classic commutator DC motor are due to the need for brushes to press against the commutator. This creates friction. Sparks are created by the brushes making and breaking circuits through the rotor coils as the brushes cross the insulating gaps between commutator sections. Depending on the commutator design, this may include the brushes shorting together adjacent sections and hence coil ends momentarily while crossing the gaps. Furthermore, the inductance of the rotor coils causes the voltage across each to rise when its circuit is opened, increasing the sparking of the brushes. This sparking limits the maximum speed of the machine, as too-rapid sparking will overheat, erode, or even melt the commutator. The current density per unit area of the brushes, in combination with their resistivity, limits the output of the motor. The making and breaking of electric contact also generates electrical noise; sparking generates RFI. Brushes eventually wear out and require replacement, and the commutator itself is subject to wear and maintenance (on larger motors) or replacement (on small motors). The commutator assembly on a large motor is a costly element, requiring precision assembly of many parts. On small motors, the commutator is usually permanently integrated into the rotor, so replacing it usually requires replacing the whole rotor.
What motor components most need replacement and maintenance?
A: Brushes

Context and question: In 2002, Elizabeth marked her Golden Jubilee. Her sister and mother died in February and March respectively, and the media speculated whether the Jubilee would be a success or a failure. She again undertook an extensive tour of her realms, which began in Jamaica in February, where she called the farewell banquet "memorable" after a power cut plunged the King's House, the official residence of the governor-general, into darkness. As in 1977, there were street parties and commemorative events, and monuments were named to honour the occasion. A million people attended each day of the three-day main Jubilee celebration in London, and the enthusiasm shown by the public for the Queen was greater than many journalists had expected.
What relative of Elizabeth died in February of 2002?
Answer: Her sister

Question: Sacerdotalis caelibatus (Latin for "Of the celibate priesthood"), promulgated on 24 June 1967, defends the Catholic Church's tradition of priestly celibacy in the West. This encyclical was written in the wake of Vatican II, when the Catholic Church was questioning and revising many long-held practices. Priestly celibacy is considered a discipline rather than dogma, and some had expected that it might be relaxed. In response to these questions, the Pope reaffirms the discipline as a long-held practice with special importance in the Catholic Church. The encyclical Sacerdotalis caelibatus from 24 June 1967, confirms the traditional Church teaching, that celibacy is an ideal state and continues to be mandatory for Roman Catholic priests. Celibacy symbolizes the reality of the kingdom of God amid modern society. The priestly celibacy is closely linked to the sacramental priesthood. However, during his pontificate Paul VI was considered generous in permitting bishops to grant laicization of priests who wanted to leave the sacerdotal state, a position which was drastically reversed by John Paul II in 1980 and cemented in the 1983 Canon Law that only the pope can in exceptional circumstances grant laicization.
Is there an answer to this question: What is seen as symbolizing the reality of living in the modern world as Roman Catholic priest?

Answer: Celibacy

Energy transfer can be considered for the special case of systems which are closed to transfers of matter. The portion of the energy which is transferred by conservative forces over a distance is measured as the work the source system does on the receiving system. The portion of the energy which does not do work during the transfer is called heat.[note 4] Energy can be transferred between systems in a variety of ways. Examples include the transmission of electromagnetic energy via photons, physical collisions which transfer kinetic energy,[note 5] and the conductive transfer of thermal energy.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What can be considered for the typical case of systems which are opened to transfers of matter?
Ah, so..
unanswerable