Problem: Solar energy:

In the last two decades, photovoltaics (PV), also known as solar PV, has evolved from a pure niche market of small scale applications towards becoming a mainstream electricity source. A solar cell is a device that converts light directly into electricity using the photoelectric effect. The first solar cell was constructed by Charles Fritts in the 1880s. In 1931 a German engineer, Dr Bruno Lange, developed a photo cell using silver selenide in place of copper oxide. Although the prototype selenium cells converted less than 1% of incident light into electricity, both Ernst Werner von Siemens and James Clerk Maxwell recognized the importance of this discovery. Following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the crystalline silicon solar cell in 1954. These early solar cells cost 286 USD/watt and reached efficiencies of 4.56%. By 2012 available efficiencies exceed 20% and the maximum efficiency of research photovoltaics is over 40%.

What is a solar cell?
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A: a device that converts light directly into electricity

Problem: Copper's greater conductivity versus other metals enhances the electrical energy efficiency of motors. This is important because motors and motor-driven systems account for 43%-46% of all global electricity consumption and 69% of all electricity used by industry. Increasing the mass and cross section of copper in a coil increases the electrical energy efficiency of the motor. Copper motor rotors, a new technology designed for motor applications where energy savings are prime design objectives, are enabling general-purpose induction motors to meet and exceed National Electrical Manufacturers Association (NEMA) premium efficiency standards.
What does the acronym NEMA stand against?
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Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Strasbourg features a number of prominent parks, of which several are of cultural and historical interest: the Parc de l'Orangerie, laid out as a French garden by Andre le Notre and remodeled as an English garden on behalf of Josephine de Beauharnais, now displaying noteworthy French gardens, a neo-classical castle and a small zoo; the Parc de la Citadelle, built around impressive remains of the 17th-century fortress erected close to the Rhine by Vauban; the Parc de Pourtales, laid out in English style around a baroque castle (heavily restored in the 19th century) that now houses a small three-star hotel, and featuring an open-air museum of international contemporary sculpture. The Jardin botanique de l'Universite de Strasbourg (botanical garden) was created under the German administration next to the Observatory of Strasbourg, built in 1881, and still owns some greenhouses of those times. The Parc des Contades, although the oldest park of the city, was completely remodeled after World War II. The futuristic Parc des Poteries is an example of European park-conception in the late 1990s. The Jardin des deux Rives, spread over Strasbourg and Kehl on both sides of the Rhine opened in 2004 and is the most extended (60-hectare) park of the agglomeration. The most recent park is Parc du Heyritz (8,7 ha), opened in 2014 along a canal facing the hopital civil.
What year was the Observatory of Strasbourg built?
A: 1881

Context and question: In contrast to Catholic allegations of rationalism and naturalism, Protestant objections are more likely to be based on allegations of mysticism, occultism, and even Satanism. Masonic scholar Albert Pike is often quoted (in some cases misquoted) by Protestant anti-Masons as an authority for the position of Masonry on these issues. However, Pike, although undoubtedly learned, was not a spokesman for Freemasonry and was also controversial among Freemasons in general. His writings represented his personal opinion only, and furthermore an opinion grounded in the attitudes and understandings of late 19th century Southern Freemasonry of the USA. Notably, his book carries in the preface a form of disclaimer from his own Grand Lodge. No one voice has ever spoken for the whole of Freemasonry.
Who is generally accepted as the voice of Freemasonry?
Answer: No one voice

Question: The gyromagnetic ratio is the constant of proportionality between the frequency of nuclear magnetic resonance (or electron paramagnetic resonance for electrons) and the applied magnetic field B: = B. It is difficult to measure gyromagnetic ratios precisely because of the difficulties in precisely measuring B, but the value for protons in water at 7002298150000000000♠️25 C is known to better than one part per million. The protons are said to be "shielded" from the applied magnetic field by the electrons in the water molecule, the same effect that gives rise to chemical shift in NMR spectroscopy, and this is indicated by a prime on the symbol for the gyromagnetic ratio, p. The gyromagnetic ratio is related to the shielded proton magnetic moment p, the spin number I (I = 12 for protons) and the reduced Planck constant.
Is there an answer to this question: What effect is a the same effect that gives rise to chemical shift in KMR spectroscopy?

Answer: unanswerable

On June 22, 1990, Volodymyr Ivashko withdrew his candidacy for leader of the Communist Party of Ukraine in view of his new position in parliament. Stanislav Hurenko was elected first secretary of the CPU. On July 11, Ivashko resigned from his post as chairman of the Ukrainian Parliament after he was elected deputy general secretary of the Communist Party of the Soviet Union. The Parliament accepted the resignation a week later, on July 18. On July 16 Parliament overwhelmingly approved the Declaration on State Sovereignty of Ukraine - with a vote of 355 in favour and four against. The people's deputies voted 339 to 5 to proclaim July 16 a Ukrainian national holiday.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many Parliament members voted against the Declaration on State Sovereignty of Ukraine?
Ah, so..
four