Input: Read this: An electromagnetic wave refractor in some aperture antennas is a component which due to its shape and position functions to selectively delay or advance portions of the electromagnetic wavefront passing through it. The refractor alters the spatial characteristics of the wave on one side relative to the other side. It can, for instance, bring the wave to a focus or alter the wave front in other ways, generally in order to maximize the directivity of the antenna system. This is the radio equivalent of an optical lens.
Question: A refractor can be compared to what type of viewing?

Output: optical lens

QUES: An intellectual revitalization of Europe started with the birth of medieval universities in the 12th century. The contact with the Islamic world in Spain and Sicily, and during the Reconquista and the Crusades, allowed Europeans access to scientific Greek and Arabic texts, including the works of Aristotle, Ptolemy, Jabir ibn Hayyan, al-Khwarizmi, Alhazen, Avicenna, and Averroes. European scholars had access to the translation programs of Raymond of Toledo, who sponsored the 12th century Toledo School of Translators from Arabic to Latin. Later translators like Michael Scotus would learn Arabic in order to study these texts directly. The European universities aided materially in the translation and propagation of these texts and started a new infrastructure which was needed for scientific communities. In fact, European university put many works about the natural world and the study of nature at the center of its curriculum, with the result that the "medieval university laid far greater emphasis on science than does its modern counterpart and descendent."

Which translator learned Arabic to be able to study the Arabic texts directly?
What is the answer?
ANS: Michael Scotus

QUES: It is also stated that Hera kidnapped Eileithyia, the goddess of childbirth, to prevent Leto from going into labor. The other gods tricked Hera into letting her go by offering her a necklace, nine yards (8 m) long, of amber. Mythographers agree that Artemis was born first and then assisted with the birth of Apollo, or that Artemis was born one day before Apollo, on the island of Ortygia and that she helped Leto cross the sea to Delos the next day to give birth to Apollo. Apollo was born on the seventh day (, hebdomagenes) of the month Thargelion according to Delian traditionor of the month Bysiosaccording to Delphian tradition. The seventh and twentieth, the days of the new and full moon, were ever afterwards held sacred to him.
What was the day of the new moon?

ANS: The seventh

In 1584, Elizabeth I granted a charter to Sir Walter Raleigh, for whom the state capital is named, for land in present-day North Carolina (then part of the territory of Virginia). It was the second American territory which the English attempted to colonize. Raleigh established two colonies on the coast in the late 1580s, but both failed. The fate of the "Lost Colony" of Roanoke Island remains one of the most widely debated mysteries of American history. Virginia Dare, the first English child to be born in North America, was born on Roanoke Island on August 18, 1587; Dare County is named for her.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who granted the charter for Sir Walter Raleigh to travel to present day North Carolina?
Ah, so.. Elizabeth I

Question: The construction of cathedrals and castles advanced building technology, leading to the development of large stone buildings. Ancillary structures included new town halls, houses, bridges, and tithe barns. Shipbuilding improved with the use of the rib and plank method rather than the old Roman system of mortise and tenon. Other improvements to ships included the use of lateen sails and the stern-post rudder, both of which increased the speed at which ships could be sailed.
Try to answer this question if possible: What type of rudder was introduced during this period?
Answer: stern-post

Question: In July 2013, there were 41,000 non-Germans by citizenship living in Thuringia (1.9% of the population among the smallest proportions of any state in Germany). Nevertheless, the number rose from 33,000 in July 2011, an increase of 24% in only two years. About 4% of the population are migrants (including persons that already received the German citizenship). The biggest groups of foreigners by citizenship are (as of 2012): Russians (3,100), Poles (3,000), Vietnamese (2,800), Turks (2,100) and Ukrainians (2,000). The amount of foreigners varies between regions: the college towns Erfurt, Jena, Weimar and Ilmenau have the highest rates, whereas there are almost no migrants living in the most rural smaller municipalities.
Try to answer this question if possible: What is the largest group of foreigners?
Answer:
Russians