Problem: Middle Ages:

The various Germanic states in the west all had coinages that imitated existing Roman and Byzantine forms. Gold continued to be minted until the end of the 7th century, when it was replaced by silver coins. The basic Frankish silver coin was the denarius or denier, while the Anglo-Saxon version was called a penny. From these areas, the denier or penny spread throughout Europe during the centuries from 700 to 1000. Copper or bronze coins were not struck, nor were gold except in Southern Europe. No silver coins denominated in multiple units were minted.

During what century did gold coinage cease?
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A: 7th


Problem: A lot of temples dedicated to Apollo were built in Greece and in the Greek colonies, and they show the spread of the cult of Apollo, and the evolution of the Greek architecture, which was mostly based on the rightness of form, and on mathematical relations. Some of the earliest temples, especially in Crete, don't belong to any Greek order. It seems that the first peripteral temples were rectangle wooden structures. The different wooden elements were considered divine, and their forms were preserved in the marble or stone elements of the temples of Doric order. The Greeks used standard types, because they believed that the world of objects was a series of typical forms which could be represented in several instances. The temples should be canonic, and the architects were trying to achieve the esthetic perfection. From the earliest times there were certain rules strictly observed in rectangular peripteral and prostyle buildings. The first buildings were narrow to hold the roof, and when the dimensions changed, some mathematical relations became necessary, in order to keep the original forms. This probably influenced the theory of numbers of Pythagoras, who believed that behind the appearance of things, there was the permanent principle of mathematics.
Why were the first buildings narrow?
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Answer: to hold the roof


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
On May 16, rescue groups from South Korea, Japan, Singapore, Russia and Taiwan arrived to join the rescue effort. The United States shared some of its satellite images of the quake-stricken areas with Chinese authorities. During the weekend, the US sent into China two U.S. Air Force C-17's carrying supplies, which included tents and generators. Xinhua reported 135,000 Chinese troops and medics were involved in the rescue effort across 58 counties and cities.
What was included in the the Air Force C-17 supplies?
A: tents and generators


Context and question: Although an alloy is technically an impure metal, when referring to alloys, the term "impurities" usually denotes those elements which are not desired. These impurities are often found in the base metals or the solutes, but they may also be introduced during the alloying process. For instance, sulfur is a common impurity in steel. Sulfur combines readily with iron to form iron sulfide, which is very brittle, creating weak spots in the steel. Lithium, sodium and calcium are common impurities in aluminium alloys, which can have adverse effects on the structural integrity of castings. Conversely, otherwise pure-metals that simply contain unwanted impurities are often called "impure metals" and are not usually referred to as alloys. Oxygen, present in the air, readily combines with most metals to form metal oxides; especially at higher temperatures encountered during alloying. Great care is often taken during the alloying process to remove excess impurities, using fluxes, chemical additives, or other methods of extractive metallurgy.
Lithium, sodium and what other elements are common in steel?
Answer: unanswerable


Question: In Buddhist practice, it is said that while samatha meditation can calm the mind, only vipassanā meditation can reveal how the mind was disturbed to start with, which is what leads to insight knowledge (jñāna; Pāli ñāṇa) and understanding (prajñā Pāli paññā), and thus can lead to nirvāṇa (Pāli nibbāna). When one is in jhana, all defilements are suppressed temporarily. Only understanding (prajñā or vipassana) eradicates the defilements completely. Jhanas are also states that Arahants abide in order to rest.
Is there an answer to this question: What is the term for understanding?

Answer: prajñā


Question: Federalism has a long tradition in German history. The Holy Roman Empire comprised many petty states numbering more than 300 around 1796. The number of territories was greatly reduced during the Napoleonic Wars (1796–1814). After the Congress of Vienna (1815), 39 states formed the German Confederation. The Confederation was dissolved after the Austro-Prussian War and replaced by a North German Federation under Prussian hegemony; this war left Prussia dominant in Germany, and German nationalism would compel the remaining independent states to ally with Prussia in the Franco-Prussian War of 1870–71, and then to accede to the crowning of King Wilhelm of Prussia as German Emperor. The new German Empire included 25 states (three of them, Hanseatic cities) and the imperial territory of Alsace-Lorraine. The empire was dominated by Prussia, which controlled 65% of the territory and 62% of the population. After the territorial losses of the Treaty of Versailles, the remaining states continued as republics of a new German federation. These states were gradually de facto abolished and reduced to provinces under the Nazi regime via the Gleichschaltung process, as the states administratively were largely superseded by the Nazi Gau system.
Is there an answer to this question: A North German Federation under Prussian hegemony replaced what confederation?

Answer:
the German Confederation