Problem: FA Cup:

Seven clubs have won the FA Cup as part of a League and Cup double, namely Preston North End (1889), Aston Villa (1897), Tottenham Hotspur (1961), Arsenal (1971, 1998, 2002), Liverpool (1986), Manchester United (1994, 1996, 1999) and Chelsea (2010). In 1993, Arsenal became the first side to win both the FA Cup and the League Cup in the same season when they beat Sheffield Wednesday 2–1 in both finals. Liverpool (in 2001) and Chelsea (in 2007) have since repeated this feat. In 2012, Chelsea accomplished a different cup double consisting of the FA Cup and the 2012 Champions League. In 1998–99, Manchester United added the 1999 Champions League title to their league and cup double to complete a unique Treble. Two years later, in 2000–01, Liverpool won the FA Cup, League Cup and UEFA Cup to complete a cup treble. An English Treble has never been achieved.

Who lost to Arsenal in 1993?
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A: unanswerable


Problem: High-definition television:

The British high-definition TV service started trials in August 1936 and a regular service on 2 November 1936 using both the (mechanical) Baird 240 line sequential scan (later to be inaccurately rechristened 'progressive') and the (electronic) Marconi-EMI 405 line interlaced systems. The Baird system was discontinued in February 1937. In 1938 France followed with their own 441-line system, variants of which were also used by a number of other countries. The US NTSC 525-line system joined in 1941. In 1949 France introduced an even higher-resolution standard at 819 lines, a system that should have been high definition even by today's standards, but was monochrome only and the technical limitations of the time prevented it from achieving the definition of which it should have been capable. All of these systems used interlacing and a 4:3 aspect ratio except the 240-line system which was progressive (actually described at the time by the technically correct term "sequential") and the 405-line system which started as 5:4 and later changed to 4:3. The 405-line system adopted the (at that time) revolutionary idea of interlaced scanning to overcome the flicker problem of the 240-line with its 25 Hz frame rate. The 240-line system could have doubled its frame rate but this would have meant that the transmitted signal would have doubled in bandwidth, an unacceptable option as the video baseband bandwidth was required to be not more than 3 MHz.

Who started trials in September 1936?
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A: unanswerable


Problem: Muslim world:

A famous example of Arabic poetry and Persian poetry on romance (love) is Layla and Majnun, dating back to the Umayyad era in the 7th century. It is a tragic story of undying love much like the later Romeo and Juliet, which was itself said to have been inspired by a Latin version of Layla and Majnun to an extent. Ferdowsi's Shahnameh, the national epic of Iran, is a mythical and heroic retelling of Persian history. Amir Arsalan was also a popular mythical Persian story, which has influenced some modern works of fantasy fiction, such as The Heroic Legend of Arslan.

In what century does Layla and Majnun originate?
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A: 7th century


Problem: Liberia:

Numerous immigrants have come as merchants and become a major part of the business community, including Lebanese, Indians, and other West African nationals. There is a high percentage of interracial marriage between ethnic Liberians and the Lebanese, resulting in a significant mixed-race population especially in and around Monrovia. A small minority of Liberians of European descent reside in the country.[better source needed] The Liberian constitution restricts citizenship to people of Black African descent.

The interracial couples in Liberia result in what?
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A:
a significant mixed-race population