Article: The playing time of a phonograph record depended on the turntable speed and the groove spacing. At the beginning of the 20th century, the early discs played for two minutes, the same as early cylinder records. The 12-inch disc, introduced by Victor in 1903, increased the playing time to three and a half minutes. Because a 10-inch 78 rpm record could hold about three minutes of sound per side and the 10-inch size was the standard size for popular music, almost all popular recordings were limited to around three minutes in length. For example, when King Oliver's Creole Jazz Band, including Louis Armstrong on his first recordings, recorded 13 sides at Gennett Records in Richmond, Indiana, in 1923, one side was 2:09 and four sides were 2:522:59.

Question: What was the normal size disc for popular music?
Ans: 10-inch

Article: Industries slowly brought the city and its inhabitants back to a renewed vitality and jobs attracted new residents. As the city's commerce improved, residents worked to restore or create community institutions. In 1865, the Avery Normal Institute was established by the American Missionary Association as the first free secondary school for Charleston's African American population. General William T. Sherman lent his support to the conversion of the United States Arsenal into the Porter Military Academy, an educational facility for former soldiers and boys left orphaned or destitute by the war. Porter Military Academy later joined with Gaud School and is now a university-preparatory school, Porter-Gaud School.

Question: What association founded the Avery Normal Institute?
Ans: the American Missionary Association

Article: In 2008[update] the total number of full-time equivalent jobs was 125,037. The number of jobs in the primary sector was 203, of which 184 were in agriculture and 19 were in forestry or lumber production. The number of jobs in the secondary sector was 15,476 of which 7,650 or (49.4%) were in manufacturing, 51 or (0.3%) were in mining and 6,389 (41.3%) were in construction. The number of jobs in the tertiary sector was 109,358. In the tertiary sector; 11,396 or 10.4% were in wholesale or retail sales or the repair of motor vehicles, 10,293 or 9.4% were in the movement and storage of goods, 5,090 or 4.7% were in a hotel or restaurant, 7,302 or 6.7% were in the information industry, 8,437 or 7.7% were the insurance or financial industry, 10,660 or 9.7% were technical professionals or scientists, 5,338 or 4.9% were in education and 17,903 or 16.4% were in health care.

Question: How many jobs are in the secondary sector?
Ans: 15,476

Article: After the People's Republic of China took control of Mainland China in 1949, the Republic of China government based in Taiwan continued to control the Dachen Islands off the coast of Zhejiang until 1955, even establishing a rival Zhejiang provincial government there, creating a situation similar to Fujian province today. During the Cultural Revolution (196676), Zhejiang was in chaos and disunity, and its economy was stagnant, especially during the high tide (196669) of the revolution. The agricultural policy favoring grain production at the expense of industrial and cash crops intensified economic hardships in the province. Mao's self-reliance policy and the reduction in maritime trade cut off the lifelines of the port cities of Ningbo and Wenzhou. While Mao invested heavily in railroads in interior China, no major railroads were built in South Zhejiang, where transportation remained poor.

Question: When did the Republic of China control the Dachen Islands until?
Ans:
1955