Problem: Anti-aircraft warfare:

If current trends continue, missiles will replace gun systems completely in "first line" service.[citation needed] Guns are being increasingly pushed into specialist roles, such as the Dutch Goalkeeper CIWS, which uses the GAU-8 Avenger 30 mm seven-barrel Gatling gun for last ditch anti-missile and anti-aircraft defence. Even this formerly front-line weapon is currently being replaced by new missile systems, such as the RIM-116 Rolling Airframe Missile, which is smaller, faster, and allows for mid-flight course correction (guidance) to ensure a hit. To bridge the gap between guns and missiles, Russia in particular produces the Kashtan CIWS, which uses both guns and missiles for final defence. Two six-barrelled 30 mm Gsh-6-30 Gatling guns and 9M311 surface-to-air missiles provide for its defensive capabilities.

What is likely to entirely replace gun systems?
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A: missiles


Problem: Antarctica is the coldest of Earth's continents. The coldest natural temperature ever recorded on Earth was −89.2 °C (−128.6 °F) at the Soviet (now Russian) Vostok Station in Antarctica on 21 July 1983. For comparison, this is 10.7 °C (20 °F) colder than subliming dry ice at one atmosphere of partial pressure, but since CO2 only makes up 0.039% of air, temperatures of less than −150 °C (−238 °F) would be needed to produce dry ice snow in Antarctica. Antarctica is a frozen desert with little precipitation; the South Pole itself receives less than 10 cm (4 in) per year, on average. Temperatures reach a minimum of between −80 °C (−112 °F) and −89.2 °C (−128.6 °F) in the interior in winter and reach a maximum of between 5 °C (41 °F) and 15 °C (59 °F) near the coast in summer. Sunburn is often a health issue as the snow surface reflects almost all of the ultraviolet light falling on it. Given the latitude, long periods of constant darkness or constant sunlight create climates unfamiliar to human beings in much of the rest of the world.
What is the coldest temerature recorded in Russia?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The mosaics of St. Peter's often show lively Baroque compositions based on designs or canvases from like Ciro Ferri, Guido Reni, Domenichino, Carlo Maratta, and many others. Raphael is represented by a mosaic replica of this last painting, the Transfiguration. Many different artists contributed to the 17th- and 18th-century mosaics in St. Peter's, including Giovanni Battista Calandra, Fabio Cristofari (died 1689), and Pietro Paolo Cristofari (died 1743). Works of the Fabbrica were often used as papal gifts.
What year did Pietro Paolo Cristofari die?
A: 1743


Context and question: Adventurer and poet Luís de Camões (c. 1524–1580) wrote the epic poem "Os Lusíadas" (The Lusiads), with Virgil's Aeneid as his main influence. Modern Portuguese poetry is rooted in neoclassic and contemporary styles, as exemplified by Fernando Pessoa (1888–1935). Modern Portuguese literature is represented by authors such as Almeida Garrett, Camilo Castelo Branco, Eça de Queiroz, Fernando Pessoa, Sophia de Mello Breyner Andresen, António Lobo Antunes and Miguel Torga. Particularly popular and distinguished is José Saramago, recipient of the 1998 Nobel Prize in Literature.
Who was Luís de Camões?
Answer: Adventurer and poet


Question: The cheerful crowds visiting bomb sites were so large they interfered with rescue work, pub visits increased in number (beer was never rationed), and 13,000 attended cricket at Lord's. People left shelters when told instead of refusing to leave, although many housewives reportedly enjoyed the break from housework. Some people even told government surveyors that they enjoyed air raids if they occurred occasionally, perhaps once a week. Despite the attacks, defeat in Norway and France, and the threat of invasion, overall morale remained high; a Gallup poll found only 3% of Britons expected to lose the war in May 1940, another found an 88% approval rating for Churchill in July, and a third found 89% support for his leadership in October. Support for peace negotiations declined from 29% in February. Each setback caused more civilians to volunteer to become unpaid Local Defence Volunteers, workers worked longer shifts and over weekends, contributions rose to the £5,000 "Spitfire Funds" to build fighters, and the number of work days lost to strikes in 1940 was the lowest in history.:60–63,67–68,75,78–79,215–216
Is there an answer to this question: What was Churchill's highest rating? 

Answer: 89%


Lighting design as it applies to the built environment is known as 'architectural lighting design'. Lighting of structures considers aesthetic elements as well as practical considerations of quantity of light required, occupants of the structure, energy efficiency and cost. Artificial lighting takes into account the amount of daylight received in an internal space by using Daylight factor calculation. For simple installations, hand-calculations based on tabular data are used to provide an acceptable lighting design. More critical or optimized designs now routinely use mathematical modeling on a computer using software such as Radiance which can allow an Architect to quickly undertake complex calculations to review the benefit of a particular design.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is the name of the software sometimes used to help calculate lighting needs in a built environment?
Ah, so..
Radiance