Here is a question about this article: Seismology: To better prepare for calamities, Zhang Heng invented a seismometer in 132 CE which provided instant alert to authorities in the capital Luoyang that an earthquake had occurred in a location indicated by a specific cardinal or ordinal direction. Although no tremors could be felt in the capital when Zhang told the court that an earthquake had just occurred in the northwest, a message came soon afterwards that an earthquake had indeed struck 400 km (248 mi) to 500 km (310 mi) northwest of Luoyang (in what is now modern Gansu). Zhang called his device the 'instrument for measuring the seasonal winds and the movements of the Earth' (Houfeng didong yi ), so-named because he and others thought that earthquakes were most likely caused by the enormous compression of trapped air. See Zhang's seismometer for further details.
What is the answer to this question: What is the Chinese name for a seismometer?
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So... Houfeng didong yi

Here is a question about this article: As in the Scheiner system, speeds were expressed in 'degrees'. Originally the sensitivity was written as a fraction with 'tenths' (for example "18/10 DIN"), where the resultant value 1.8 represented the relative base 10 logarithm of the speed. 'Tenths' were later abandoned with DIN 4512:1957-11, and the example above would be written as "18 DIN". The degree symbol was finally dropped with DIN 4512:1961-10. This revision also saw significant changes in the definition of film speeds in order to accommodate then-recent changes in the American ASA PH2.5-1960 standard, so that film speeds of black-and-white negative film effectively would become doubled, that is, a film previously marked as "18 DIN" would now be labeled as "21 DIN" without emulsion changes.
What is the answer to this question: When did the degree symbol fall out of use in the DIN system?
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So... with DIN 4512:1961-10

Here is a question about this article: As one of the most successful teams in the country, Arsenal have often featured when football is depicted in the arts in Britain. They formed the backdrop to one of the earliest football-related films, The Arsenal Stadium Mystery (1939). The film centres on a friendly match between Arsenal and an amateur side, one of whose players is poisoned while playing. Many Arsenal players appeared as themselves and manager George Allison was given a speaking part. More recently, the book Fever Pitch by Nick Hornby was an autobiographical account of Hornby's life and relationship with football and Arsenal in particular. Published in 1992, it formed part of the revival and rehabilitation of football in British society during the 1990s. The book was twice adapted for the cinema the 1997 British film focuses on Arsenal's 198889 title win, and a 2005 American version features a fan of baseball's Boston Red Sox.
What is the answer to this question: In what decade did film and literature help revive football in Britain?
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So...
1990s