Input: Read this: 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 4.5–6%. By 2012 available efficiencies exceed 20% and the maximum efficiency of research photovoltaics is over 40%.
Question: What has happened to photovoltaic in the past 20 years?

Output: evolved from a pure niche market of small scale applications towards becoming a mainstream electricity source


QUES: It was situated precisely in the western part of Central Asia that borders present-day Russia (and present-day Kazakhstan). It was in relative proximity to the other satem ethno-linguistic groups of the Indo-European family, like Thracian, Balto-Slavic and others, and to common Indo-European's original homeland (more precisely, the steppes of southern Russia to the north of the Caucasus), according to the reconstructed linguistic relationships of common Indo-European.

What language family originated in the mountains of Russia?
What is the answer?
ANS: unanswerable


QUES: The city was incorporated in 1854, the same year in which the Camden and Atlantic Railroad train service began. Built on the edge of the bay, this served as the direct link of this remote parcel of land with Philadelphia, Pennsylvania. That same year, construction of the Absecon Lighthouse, designed by George Meade of the Corps of Topographical Engineers, was approved, with work initiated the next year. By 1874, almost 500,000 passengers a year were coming to Atlantic City by rail. In Boardwalk Empire: The Birth, High Times, and Corruption of Atlantic City, "Atlantic City's Godfather" Nelson Johnson describes the inspiration of Dr. Jonathan Pitney (the "Father of Atlantic City") to develop Atlantic City as a health resort, his efforts to convince the municipal authorities that a railroad to the beach would be beneficial, his successful alliance with Samuel Richards (entrepreneur and member of the most influential family in southern New Jersey at the time) to achieve that goal, the actual building of the railroad, and the experience of the first 600 riders, who "were chosen carefully by Samuel Richards and Jonathan Pitney":
What is the name of the lighthouse that is located on the Atlantic City coast?

ANS: Absecon Lighthouse


The president exercises a check over Congress through his power to veto bills, but Congress may override any veto (excluding the so-called "pocket veto") by a two-thirds majority in each house. When the two houses of Congress cannot agree on a date for adjournment, the president may settle the dispute. Either house or both houses may be called into emergency session by the president. The Vice President serves as president of the Senate, but he may only vote to break a tie.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who serves as president of the Senate?
Ah, so.. The Vice President


Question: Eventually resulting in 17 libel writs in total, The Sun ran a series of false stories about the pop musician Elton John from 25 February 1987. They began with an invented account of the singer having sexual relationships with rent boys. The singer-songwriter was abroad on the day indicated in the story, as former Sun journalist John Blake, recently poached by the Daily Mirror, soon discovered. After further stories, in September 1987, The Sun accused John of having his Rottweiler guard dogs voice boxes surgically removed. In November, the Daily Mirror found their rival's only source for the rent boy story and he admitted it was a totally fictitious concoction created for money. The inaccurate story about his dogs, actually Alsatians, put pressure on The Sun, and John received £1 million in an out of court settlement, then the largest damages payment in British history. The Sun ran a front-page apology on 12 December 1988, under the banner headline "SORRY, ELTON". In May 1987 gay men were offered free one-way airline tickets to Norway to leave Britain for good: "Fly Away Gays - And We Will Pay" was the paper's headline. Gay Church of England clergymen were described in one headline in November 1987 as "Pulpit poofs".
Try to answer this question if possible: Where did The Sun offer to fly gay men in 1987?
Answer: Norway


Problem: The aftermath of World War II saw an explosion in the discovery of new classes of antibacterial drugs including the cephalosporins (developed by Eli Lilly based on the seminal work of Giuseppe Brotzu and Edward Abraham), streptomycin (discovered during a Merck-funded research program in Selman Waksman's laboratory), the tetracyclines (discovered at Lederle Laboratories, now a part of Pfizer), erythromycin (discovered at Eli Lilly and Co.) and their extension to an increasingly wide range of bacterial pathogens. Streptomycin, discovered during a Merck-funded research program in Selman Waksman's laboratory at Rutgers in 1943, became the first effective treatment for tuberculosis. At the time of its discovery, sanitoriums for the isolation of tuberculosis-infected people were an ubiquitous feature of cities in developed countries, with 50% dying within 5 years of admission.
50% of tuberculosis-infected people died within 5 years where?
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Answer:
cities in developed countries