Question: The axiomatization of mathematics, on the model of Euclid's Elements, had reached new levels of rigour and breadth at the end of the 19th century, particularly in arithmetic, thanks to the axiom schema of Richard Dedekind and Charles Sanders Peirce, and geometry, thanks to David Hilbert. At the beginning of the 20th century, efforts to base mathematics on naive set theory suffered a setback due to Russell's paradox (on the set of all sets that do not belong to themselves). The problem of an adequate axiomatization of set theory was resolved implicitly about twenty years later by Ernst Zermelo and Abraham Fraenkel. ZermeloFraenkel set theory provided a series of principles that allowed for the construction of the sets used in the everyday practice of mathematics. But they did not explicitly exclude the possibility of the existence of a set that belongs to itself. In his doctoral thesis of 1925, von Neumann demonstrated two techniques to exclude such setsthe axiom of foundation and the notion of class.
Is there an answer to this question: What 2 techniques did Von Neumann use to exclude sets in his doctoral thesis in 1925?

Answer: the axiom of foundation and the notion of class.

Question: The Premier League has the highest revenue of any football league in the world, with total club revenues of 2.48 billion in 200910. In 201314, due to improved television revenues and cost controls, the Premier League had net profits in excess of 78 million, exceeding all other football leagues. In 2010 the Premier League was awarded the Queen's Award for Enterprise in the International Trade category for its outstanding contribution to international trade and the value it brings to English football and the United Kingdom's broadcasting industry.
Is there an answer to this question: Why did it receive this award?

Answer: for its outstanding contribution to international trade and the value it brings to English football and the United Kingdom's broadcasting industry.

Question: In March 2013, Microsoft also amended its certification requirements to allow tablets to use the 1024768 resolution as a minimum; this change is expected to allow the production of certified Windows 8 tablets in smaller form factorsa market which is currently dominated by Android-based tablets. Despite the reaction of industry experts, Microsoft reported that they had sold 100 million licenses in the first six months. This matched sales of Windows 7 over a similar period. This statistic includes shipments to channel warehouses which now need to be sold in order to make way for new shipments.
Is there an answer to this question: How many licenses did Microsoft sell in the first six months?

Answer: 100 million

Question: General Electric heavily contaminated the Hudson River with polychlorinated biphenyls (PCBs) between 1947-77. This pollution caused a range of harmful effects to wildlife and people who eat fish from the river or drink the water. In response to this contamination, activists protested in various ways. Musician Pete Seeger founded the Hudson River Sloop Clearwater and the Clearwater Festival to draw attention to the problem. The activism led to the site being designated by the EPA as one of the superfund sites requiring extensive cleanup. Other sources of pollution, including mercury contamination and sewage dumping, have also contributed to problems in the Hudson River watershed.
Is there an answer to this question: In what year did sewage dumping in the Hudson River become a problem?

Answer:
unanswerable