Problem: Vinyl's lower surface noise level than shellac was not forgotten, nor was its durability. In the late 1930s, radio commercials and pre-recorded radio programs being sent to disc jockeys started being stamped in vinyl, so they would not break in the mail. In the mid-1940s, special DJ copies of records started being made of vinyl also, for the same reason. These were all 78 rpm. During and after World War II, when shellac supplies were extremely limited, some 78 rpm records were pressed in vinyl instead of shellac, particularly the six-minute 12-inch (30 cm) 78 rpm records produced by V-Disc for distribution to United States troops in World War II. In the 1940s, radio transcriptions, which were usually on 16-inch records, but sometimes 12-inch, were always made of vinyl, but cut at 33 13 rpm. Shorter transcriptions were often cut at 78 rpm.
Which material was more durable, shellac or vinyl?
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Answer: vinyl

Problem: The city is recognised for its mix of modern architecture which intersects with an extensive range of nineteenth and early twentieth century buildings. Some of the most architecturally noteworthy historic buildings include the World Heritage Site-listed Royal Exhibition Building, constructed over a two-year period for the Melbourne International Exhibition in 1880, A.C. Goode House, a Neo Gothic building located on Collins Street designed by Wright, Reed & Beaver (1891), William Pitt's Venetian Gothic style Old Stock Exchange (1888), William Wardell's Gothic Bank (1883) which features some of Melbourne's finest interiors, the incomplete Parliament House, St Paul's Cathedral (1891) and Flinders Street Station (1909), which was the busiest commuter railway station in the world in the mid-1920s.
Who designed the A.C. Goode House?
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Answer: Wright, Reed & Beaver

Problem: Other sections of society included the nobility, clergy, and townsmen. Nobles, both the titled nobility and simple knights, exploited the manors and the peasants, although they did not own lands outright but were granted rights to the income from a manor or other lands by an overlord through the system of feudalism. During the 11th and 12th centuries, these lands, or fiefs, came to be considered hereditary, and in most areas they were no longer divisible between all the heirs as had been the case in the early medieval period. Instead, most fiefs and lands went to the eldest son.[R] The dominance of the nobility was built upon its control of the land, its military service as heavy cavalry, control of castles, and various immunities from taxes or other impositions.[S] Castles, initially in wood but later in stone, began to be constructed in the 9th and 10th centuries in response to the disorder of the time, and provided protection from invaders as well as allowing lords defence from rivals. Control of castles allowed the nobles to defy kings or other overlords. Nobles were stratified; kings and the highest-ranking nobility controlled large numbers of commoners and large tracts of land, as well as other nobles. Beneath them, lesser nobles had authority over smaller areas of land and fewer people. Knights were the lowest level of nobility; they controlled but did not own land, and had to serve other nobles.[T]
In what century were castles first built?
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Answer:
9th