The problem: Answer a question about this article:
Season nine premiered on January 12, 2010. The upheaval at the judging panel continued. Ellen DeGeneres joined as a judge to replace Paula Abdul at the start of Hollywood Week.
When did season nine premiere?
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The answer: January 12, 2010

The problem: Answer a question about this article:
AA gunnery was a difficult business. The problem was of successfully aiming a shell to burst close to its target's future position, with various factors affecting the shells' predicted trajectory. This was called deflection gun-laying, 'off-set' angles for range and elevation were set on the gunsight and updated as their target moved. In this method when the sights were on the target, the barrel was pointed at the target's future position. Range and height of the target determined fuse length. The difficulties increased as aircraft performance improved.
Different things could affect what with the shell?
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The answer: predicted trajectory

The problem: Answer a question about this article:
Several governments maintain permanent manned research stations on the continent. The number of people conducting and supporting scientific research and other work on the continent and its nearby islands varies from about 1,000 in winter to about 5,000 in the summer, giving it a population density between 70 and 350 inhabitants per million square kilometres (180 and 900 per million square miles) at these times. Many of the stations are staffed year-round, the winter-over personnel typically arriving from their home countries for a one-year assignment. An Orthodox churchTrinity Church, opened in 2004 at the Russian Bellingshausen Stationis manned year-round by one or two priests, who are similarly rotated every year.
When did the Trinity Church begin its posting at Bellinshausen station?
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The answer: 2004

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A patent is a form of right granted by the government to an inventor, giving the owner the right to exclude others from making, using, selling, offering to sell, and importing an invention for a limited period of time, in exchange for the public disclosure of the invention. An invention is a solution to a specific technological problem, which may be a product or a process and generally has to fulfil three main requirements: it has to be new, not obvious and there needs to be an industrial applicability.:17
How many requirements does an invention need to fulfill for a patent?
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The answer:
three