Problem: Incandescent light bulb:

On 13 December 1904, Hungarian Sándor Just and Croatian Franjo Hanaman were granted a Hungarian patent (No. 34541) for a tungsten filament lamp that lasted longer and gave brighter light than the carbon filament. Tungsten filament lamps were first marketed by the Hungarian company Tungsram in 1904. This type is often called Tungsram-bulbs in many European countries. Filling a bulb with an inert gas such as argon or nitrogen retards the evaporation of the tungsten filament compared to operating it in a vacuum. This allows for greater temperatures and therefore greater efficacy with less reduction in filament life.

What type of gas does not fill a tungsten filament bulb?
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A: unanswerable


Problem: The English Province was a component of the international order from which it obtained its laws, direction, and instructions. It was also, however, a group of Englishmen. Its direct supervisors were from England, and the members of the English Province dwelt and labored in English cities, towns, villages, and roadways. English and European ingredients constantly came in contact. The international side of the province's existence influenced the national, and the national responded to, adapted, and sometimes constrained the international.
Where did members of the French province dwell and labor?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
As a consequence of his heart attack, Eisenhower developed a left ventricular aneurysm, which was in turn the cause of a mild stroke on November 25, 1957. This incident occurred during a cabinet meeting when Eisenhower suddenly found himself unable to speak or move his right hand. The stroke had caused an aphasia. The president also suffered from Crohn's disease, chronic inflammatory condition of the intestine, which necessitated surgery for a bowel obstruction on June 9, 1956. To treat the intestinal block, surgeons bypassed about ten inches of his small intestine. His scheduled meeting with Indian Prime Minister Jawaharlal Nehru was postponed so he could recover from surgery at his farm in Gettysburg, Pennsylvania. He was still recovering from this operation during the Suez Crisis. Eisenhower's health issues forced him to give up smoking and make some changes to his dietary habits, but he still indulged in alcohol. During a visit to England he complained of dizziness and had to have his blood pressure checked on August 29, 1959; however, before dinner at Chequers on the next day his doctor General Howard Snyder recalled Eisenhower "drank several gin-and-tonics, and one or two gins on the rocks ... three or four wines with the dinner".
Why did Eisenhower need surgery on June 9, 1956?
A: bowel obstruction


Context and question: Phase change materials such as paraffin wax and Glauber's salt are another thermal storage media. These materials are inexpensive, readily available, and can deliver domestically useful temperatures (approximately 64 °C or 147 °F). The "Dover House" (in Dover, Massachusetts) was the first to use a Glauber's salt heating system, in 1948. Solar energy can also be stored at high temperatures using molten salts. Salts are an effective storage medium because they are low-cost, have a high specific heat capacity and can deliver heat at temperatures compatible with conventional power systems. The Solar Two used this method of energy storage, allowing it to store 1.44 terajoules (400,000 kWh) in its 68 cubic metres storage tank with an annual storage efficiency of about 99%.
Paraffin wax is an example of what kind of storage media?
Answer: thermal


Question: Rendering software which cannot process a Unicode character appropriately often displays it as an open rectangle, or the Unicode "replacement character" (U+FFFD, �), to indicate the position of the unrecognized character. Some systems have made attempts to provide more information about such characters. The Apple's Last Resort font will display a substitute glyph indicating the Unicode range of the character, and the SIL International's Unicode Fallback font will display a box showing the hexadecimal scalar value of the character.
Is there an answer to this question: What is the code for the Unicode replacement character? 

Answer: U+FFFD


The Cathedral of Brasília in the capital of the Federative Republic of Brazil, is an expression of the architect Oscar Niemeyer. This concrete-framed hyperboloid structure, seems with its glass roof reaching up, open, to the heavens. On 31 May 1970, the Cathedral’s structure was finished, and only the 70 m (229.66 ft) diameter of the circular area were visible. Niemeyer's project of Cathedral of Brasília is based in the hyperboloid of revolution which sections are asymmetric. The hyperboloid structure itself is a result of 16 identical assembled concrete columns. These columns, having hyperbolic section and weighing 90 t, represent two hands moving upwards to heaven. The Cathedral was dedicated on 31 May 1970.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many identical columns are used in the Cathedral of Brasília?
Ah, so..
16