Article: The Daily Northwestern is the main student newspaper. Established in 1881, and published on weekdays during the academic year, it is directed entirely by undergraduates. Although it serves the Northwestern community, the Daily has no business ties to the university, being supported wholly by advertisers. It is owned by the Students Publishing Company. North by Northwestern is an online undergraduate magazine, having been established in September 2006 by students at the Medill School of Journalism. Published on weekdays, it consists of updates on news stories and special events inserted throughout the day and on weekends. North by Northwestern also publishes a quarterly print magazine. Syllabus is the undergraduate yearbook. First published in 1885, the yearbook is an epitome of that year's events at Northwestern. Published by Students Publishing Company and edited by Northwestern students, it is distributed in late May. Northwestern Flipside is an undergraduate satirical magazine. Founded in 2009, The Flipside publishes a weekly issue both in print and online. Helicon is the university's undergraduate literary magazine. Started in 1979, it is published twice a year, a web issue in the Winter, and a print issue with a web complement in the Spring. The Protest is Northwestern's quarterly social justice magazine. The Northwestern division of Student Multicultural Affairs also supports publications such as NUAsian, a magazine and blog about Asian and Asian-American culture and the issues facing Asians and Asian-Americans, Ahora, a magazine about Hispanic and Latino/a culture and campus life, BlackBoard Magazine about African-American life, and Al Bayan published by the Northwestern Muslim-cultural Student Association.

Question: What undergraduate satirical magazine was founded in 2009?
Ans: Northwestern Flipside

Article: 13th Street is in three parts. The first is a dead end from Avenue C. The second starts at a dead end, just before Avenue B, and runs to Greenwich Avenue, and the third part is from Eighth Avenue to Tenth Avenue.

Question: The first part of 13th Street is a dead end from which Avenue?
Ans: C

Article: In paintings, Mary is traditionally portrayed in blue. This tradition can trace its origin to the Byzantine Empire, from c.500 AD, where blue was "the colour of an empress". A more practical explanation for the use of this colour is that in Medieval and Renaissance Europe, the blue pigment was derived from the rock lapis lazuli, a stone imported from Afghanistan of greater value than gold. Beyond a painter's retainer, patrons were expected to purchase any gold or lapis lazuli to be used in the painting. Hence, it was an expression of devotion and glorification to swathe the Virgin in gowns of blue.

Question: Lapis lazuli was thought to be more valuable than which precious metal?
Ans: gold

Article: Original master discs are created by lathe-cutting: a lathe is used to cut a modulated groove into a blank record. The blank records for cutting used to be cooked up, as needed, by the cutting engineer, using what Robert K. Morrison describes as a "metallic soap," containing lead litharge, ozokerite, barium sulfate, montan wax, stearin and paraffin, among other ingredients. Cut "wax" sound discs would be placed in a vacuum chamber and gold-sputtered to make them electrically conductive for use as mandrels in an electroforming bath, where pressing stamper parts were made. Later, the French company Pyral invented a ready-made blank disc having a thin nitro-cellulose lacquer coating (approximately 7 mils thickness on both sides) that was applied to an aluminum substrate. Lacquer cuts result in an immediately playable, or processable, master record. If vinyl pressings are wanted, the still-unplayed sound disc is used as a mandrel for electroforming nickel records that are used for manufacturing pressing stampers. The electroformed nickel records are mechanically separated from their respective mandrels. This is done with relative ease because no actual "plating" of the mandrel occurs in the type of electrodeposition known as electroforming, unlike with electroplating, in which the adhesion of the new phase of metal is chemical and relatively permanent. The one-molecule-thick coating of silver (that was sprayed onto the processed lacquer sound disc in order to make its surface electrically conductive) reverse-plates onto the nickel record's face. This negative impression disc (having ridges in place of grooves) is known as a nickel master, "matrix" or "father." The "father" is then used as a mandrel to electroform a positive disc known as a "mother". Many mothers can be grown on a single "father" before ridges deteriorate beyond effective use. The "mothers" are then used as mandrels for electroforming more negative discs known as "sons". Each "mother" can be used to make many "sons" before deteriorating. The "sons" are then converted into "stampers" by center-punching a spindle hole (which was lost from the lacquer sound disc during initial electroforming of the "father"), and by custom-forming the target pressing profile. This allows them to be placed in the dies of the target (make and model) record press and, by center-roughing, to facilitate the adhesion of the label, which gets stuck onto the vinyl pressing without any glue. In this way, several million vinyl discs can be produced from a single lacquer sound disc. When only a few hundred discs are required, instead of electroforming a "son" (for each side), the "father" is removed of its silver and converted into a stamper. Production by this latter method, known as the "two-step-process" (as it does not entail creation of "sons" but does involve creation of "mothers," which are used for test playing and kept as "safeties" for electroforming future "sons") is limited to a few hundred vinyl pressings. The pressing count can increase if the stamper holds out and the quality of the vinyl is high. The "sons" made during a "three-step" electroforming make better stampers since they don't require silver removal (which reduces some high fidelity because of etching erasing part of the smallest groove modulations) and also because they have a stronger metal structure than "fathers".

Question: What is the two step process?
Ans:
"father" is removed of its silver and converted into a stamper