The problem: Answer a question about this article:
Pitch is an auditory sensation in which a listener assigns musical tones to relative positions on a musical scale based primarily on their perception of the frequency of vibration. Pitch is closely related to frequency, but the two are not equivalent. Frequency is an objective, scientific attribute that can be measured. Pitch is each person's subjective perception of a sound, which cannot be directly measured. However, this does not necessarily mean that most people won't agree on which notes are higher and lower.
What is pitch closely related to?
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The answer: frequency

The problem: Answer a question about this article:
Sometimes it is desired to bring a database back to a previous state (for many reasons, e.g., cases when the database is found corrupted due to a software error, or if it has been updated with erroneous data). To achieve this a backup operation is done occasionally or continuously, where each desired database state (i.e., the values of its data and their embedding in database's data structures) is kept within dedicated backup files (many techniques exist to do this effectively). When this state is needed, i.e., when it is decided by a database administrator to bring the database back to this state (e.g., by specifying this state by a desired point in time when the database was in this state), these files are utilized to restore that state.
What parameter is requiret to restore a database?
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The answer: desired point in time

The problem: Answer a question about this article:
The term "high fidelity" was coined in the 1920s by some manufacturers of radio receivers and phonographs to differentiate their better-sounding products claimed as providing "perfect" sound reproduction. The term began to be used by some audio engineers and consumers through the 1930s and 1940s. After 1949 a variety of improvements in recording and playback technologies, especially stereo recordings, which became widely available in 1958, gave a boost to the "hi-fi" classification of products, leading to sales of individual components for the home such as amplifiers, loudspeakers, phonographs, and tape players. High Fidelity and Audio were two magazines that hi-fi consumers and engineers could read for reviews of playback equipment and recordings.
During what years did the term HiFi take off with engineers?
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The answer: 1930s and 1940s

The problem: Answer a question about this article:
After HMS Sheffield was wrecked by an Argentinian attack, The Sun was heavily criticised and even mocked for its coverage of the war in The Daily Mirror and The Guardian, and the wider media queried the veracity of official information and worried about the number of casualties, The Sun gave its response. "There are traitors in our midst", wrote leader writer Ronald Spark on 7 May, accusing commentators on Daily Mirror and The Guardian, plus the BBC's defence correspondent Peter Snow, of "treason" for aspects of their coverage.
Who was lead writer of The Sun?
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The answer:
Ronald Spark