The problem: Answer a question about this article:
On 20 April 1992, The Freddie Mercury Tribute Concert was held at London's Wembley Stadium to a 72,000-strong crowd. Performers, including Def Leppard, Robert Plant, Guns N' Roses, Elton John, David Bowie, George Michael, Annie Lennox, Seal, Extreme, and Metallica performed various Queen songs along with the three remaining Queen members (and Spike Edney.) The concert is listed in the Guinness Book of Records as "The largest rock star benefit concert", as it was televised to over 1.2 billion viewers worldwide, and raised over 20,000,000 for AIDS charities.
When was the Freddie Mercury Tribute Concert held?
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The answer: 20 April 1992

The problem: Answer a question about this article:
Research focusing on sexual orientation uses scales of assessment to identify who belongs in which sexual population group. It is assumed that these scales will be able to reliably identify and categorize people by their sexual orientation. However, it is difficult to determine an individual's sexual orientation through scales of assessment, due to ambiguity regarding the definition of sexual orientation. Generally, there are three components of sexual orientation used in assessment. Their definitions and examples of how they may be assessed are as follows:
Why might the scales fail?
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The answer: due to ambiguity regarding the definition of sexual orientation

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During the board process an officer's record is reviewed by a selection board at the Air Force Personnel Center at Randolph Air Force Base in San Antonio, Texas. At the 10 to 11 year mark, captains will take part in a selection board to major. If not selected, they will meet a follow-on board to determine if they will be allowed to remain in the Air Force. Promotion from major to lieutenant colonel is similar and occurs approximately between the thirteen year (for officers who were promoted to major early "below the zone") and the fifteen year mark, where a certain percentage of majors will be selected below zone (i.e., "early"), in zone (i.e., "on time") or above zone (i.e., "late") for promotion to lieutenant colonel. This process will repeat at the 16 year mark (for officers previously promoted early to major and lieutenant colonel) to the 21 year mark for promotion to full colonel.
The promotion process repeats when for officers promoted early in the USAF?
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The answer: 16 year mark

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According to 16th-century mystic Rabbi Elijah of Chelm, Ashkenazi Jews lived in Jerusalem during the 11th century. The story is told that a German-speaking Palestinian Jew saved the life of a young German man surnamed Dolberger. So when the knights of the First Crusade came to siege Jerusalem, one of Dolberger's family members who was among them rescued Jews in Palestine and carried them back to Worms to repay the favor. Further evidence of German communities in the holy city comes in the form of halakhic questions sent from Germany to Jerusalem during the second half of the 11th century.
Another piece of evidence of German communities in the holy city in the second half of the 11th century is due to what items being sent from Germany to Jerusalem?
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The answer:
halakhic questions