The problem: Answer a question about this article:
At the time the store was introduced, purchased audio files used the AAC format with added encryption, based on the FairPlay DRM system. Up to five authorized computers and an unlimited number of iPods could play the files. Burning the files with iTunes as an audio CD, then re-importing would create music files without the DRM. The DRM could also be removed using third-party software. However, in a deal with Apple, EMI began selling DRM-free, higher-quality songs on the iTunes Stores, in a category called "iTunes Plus." While individual songs were made available at a cost of US$1.29, 30 more than the cost of a regular DRM song, entire albums were available for the same price, US$9.99, as DRM encoded albums. On October 17, 2007, Apple lowered the cost of individual iTunes Plus songs to US$0.99 per song, the same as DRM encoded tracks. On January 6, 2009, Apple announced that DRM has been removed from 80% of the music catalog, and that it would be removed from all music by April 2009.
By what time did Apple project its entire catalog would be free of DRM?
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The answer: April 2009

The problem: Answer a question about this article:
Alfred North Whitehead was born in Ramsgate, Kent, England, in 1861. His father, Alfred Whitehead, was a minister and schoolmaster of Chatham House Academy, a successful school for boys established by Thomas Whitehead, Alfred North's grandfather. Whitehead himself recalled both of them as being very successful schoolmasters, but that his grandfather was the more extraordinary man. Whitehead's mother was Maria Sarah Whitehead, formerly Maria Sarah Buckmaster. Whitehead was apparently not particularly close with his mother, as he never mentioned her in any of his writings, and there is evidence that Whitehead's wife, Evelyn, had a low opinion of her.
In what year was Whitehead born?
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The answer: 1861

The problem: Answer a question about this article:
In the early 21st century the Cypriot economy has diversified and become prosperous. However, in 2012 it became affected by the Eurozone financial and banking crisis. In June 2012, the Cypriot government announced it would need 1.8 billion in foreign aid to support the Cyprus Popular Bank, and this was followed by Fitch downgrading Cyprus's credit rating to junk status. Fitch said Cyprus would need an additional 4 billion to support its banks and the downgrade was mainly due to the exposure of Bank of Cyprus, Cyprus Popular Bank and Hellenic Bank, Cyprus's three largest banks, to the Greek financial crisis.
What affected the Cypriot economy in 2012?
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The answer: Eurozone financial and banking crisis

The problem: Answer a question about this article:
The reason for this is that a quantum disjunction, unlike the case for classical disjunction, can be true even when both of the disjuncts are false and this is, in turn, attributable to the fact that it is frequently the case, in quantum mechanics, that a pair of alternatives are semantically determinate, while each of its members are necessarily indeterminate. This latter property can be illustrated by a simple example. Suppose we are dealing with particles (such as electrons) of semi-integral spin (angular momentum) for which there are only two possible values: positive or negative. Then, a principle of indetermination establishes that the spin, relative to two different directions (e.g., x and y) results in a pair of incompatible quantities. Suppose that the state of a certain electron verifies the proposition "the spin of the electron in the x direction is positive." By the principle of indeterminacy, the value of the spin in the direction y will be completely indeterminate for . Hence, can verify neither the proposition "the spin in the direction of y is positive" nor the proposition "the spin in the direction of y is negative." Nevertheless, the disjunction of the propositions "the spin in the direction of y is positive or the spin in the direction of y is negative" must be true for . In the case of distribution, it is therefore possible to have a situation in which , while .
What is the difference of quantum disjunction from classic?
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The answer:
can be true even when both of the disjuncts are false