Problem: It is also known as the Wenchuan earthquake (Chinese: ; pinyin: Wenchuan da dizhen; literally: "Great Wenchuan earthquake"), after the location of the earthquake's epicenter, Wenchuan County, Sichuan. The epicenter was 80 kilometres (50 mi) west-northwest of Chengdu, the provincial capital, with a focal depth of 19 km (12 mi). The earthquake was also felt in nearby countries and as far away as both Beijing and Shanghai1,500 km (930 mi) and 1,700 km (1,060 mi) awaywhere office buildings swayed with the tremor. Strong aftershocks, some exceeding magnitude 6, continued to hit the area even months after the main quake, causing new casualties and damage.
How far was it from Chengdu?
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Answer: 80 kilometres

Problem: Socially, while liberty and freedom of enterprise form the basis of its beliefs, elements of the party have wavered between what is termed "small-l liberalism" and social conservatism. Historically, Liberal Governments have been responsible for the carriage of a number of notable "socially liberal" reforms, including the opening of Australia to multiethnic immigration under Menzies and Harold Holt; Holt's 1967 Referendum on Aboriginal Rights; Sir John Gorton's support for cinema and the arts; selection of the first Aboriginal Senator, Neville Bonner, in 1971; and Malcolm Fraser's Aboriginal Land Rights Act 1976. A West Australian Liberal, Ken Wyatt, became the first Indigenous Australian elected to the House of Representatives in 2010.
Who was the first indigenous liberal elected to the House?
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Answer: unanswerable

Problem: Von Neumann introduced the study of rings of operators, through the von Neumann algebras. A von Neumann algebra is a *-algebra of bounded operators on a Hilbert space that is closed in the weak operator topology and contains the identity operator. The von Neumann bicommutant theorem shows that the analytic definition is equivalent to a purely algebraic definition as an algebra of symmetries. The direct integral was introduced in 1949 by John von Neumann. One of von Neumann's analyses was to reduce the classification of von Neumann algebras on separable Hilbert spaces to the classification of factors.
What was introduced in von Neumann algebras?
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Answer:
study of rings of operators