Problem: Printed circuit board:

Through-hole manufacture adds to board cost by requiring many holes to be drilled accurately, and limits the available routing area for signal traces on layers immediately below the top layer on multi-layer boards since the holes must pass through all layers to the opposite side. Once surface-mounting came into use, small-sized SMD components were used where possible, with through-hole mounting only of components unsuitably large for surface-mounting due to power requirements or mechanical limitations, or subject to mechanical stress which might damage the PCB.

A component might not be able to be made any smaller because of its mechanical limitations or what other need?
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A: power requirements

Problem: In 1165 Maimonides visited Jerusalem and prayed on the Temple Mount, in the "great, holy house". In 1141 Spanish-Jewish poet, Yehuda Halevi, issued a call to the Jews to emigrate to the Land of Israel, a journey he undertook himself. In 1187 Sultan Saladin, founder of the Ayyubid dynasty, defeated the Crusaders in the Battle of Hattin and subsequently captured Jerusalem and almost all of Palestine. In time, Saladin issued a proclamation inviting Jews to return and settle in Jerusalem, and according to Judah al-Harizi, they did: "From the day the Arabs took Jerusalem, the Israelites inhabited it." Al-Harizi compared Saladin's decree allowing Jews to re-establish themselves in Jerusalem to the one issued by the Persian king Cyrus the Great over 1,600 years earlier.
When did Maimonides visit Jerusalem?
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Answer: 1165

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The Northern Ireland Peace Process has led to a number of unusual arrangements between the Republic of Ireland, Northern Ireland and the United Kingdom. For example, citizens of Northern Ireland are entitled to the choice of Irish or British citizenship or both and the Governments of Ireland and the United Kingdom consult on matters not devolved to the Northern Ireland Executive. The Northern Ireland Executive and the Government of Ireland also meet as the North/South Ministerial Council to develop policies common across the island of Ireland. These arrangements were made following the 1998 Good Friday Agreement.
What has caused several uncommon arrangements between the various states in the United Kingdom?
A: The Northern Ireland Peace Process

Context and question: However, by the turn of the 1990s the downward trend was starting to reverse; England had been successful in the 1990 FIFA World Cup, reaching the semi-finals. UEFA, European football's governing body, lifted the five-year ban on English clubs playing in European competitions in 1990 (resulting in Manchester United lifting the UEFA Cup Winners' Cup in 1991) and the Taylor Report on stadium safety standards, which proposed expensive upgrades to create all-seater stadiums in the aftermath of the Hillsborough disaster, was published in January of that year.
In which year was the Taylor Report published?
Answer: 1990

Question: The Chronicle provides a mythic tale of Oleg's death. A sorcerer prophesies that the death of the Grand Prince would be associated with a certain horse. Oleg has the horse sequestered, and it later dies. Oleg goes to visit the horse and stands over the carcass, gloating that he had outlived the threat, when a snake strikes him from among the bones, and he soon becomes ill and dies. The Chronicle reports that Prince Igor succeeded Oleg in 913, and after some brief conflicts with the Drevlians and the Pechenegs, a period of peace ensued for over twenty years.
Is there an answer to this question: Who conquered and killed Oleg?

Answer: unanswerable

Problem: Chinese characters:

Although most often associated with the People's Republic of China, character simplification predates the 1949 communist victory. Caoshu, cursive written text, almost always includes character simplification, and simplified forms have always existed in print, albeit not for the most formal works. In the 1930s and 1940s, discussions on character simplification took place within the Kuomintang government, and a large number of Chinese intellectuals and writers have long maintained that character simplification would help boost literacy in China. Indeed, this desire by the Kuomintang to simplify the Chinese writing system (inherited and implemented by the Communist Party of China) also nursed aspirations of some for the adoption of a phonetic script based on the Latin script, and spawned such inventions as the Gwoyeu Romatzyh.

What is Caoshu?
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A:
cursive written text