The problem: Answer a question about this article:
Following the death of Grand Prince Igor in 945, his wife Olga ruled as regent in Kiev until their son Sviatoslav reached maturity (ca. 963). His decade-long reign over Rus' was marked by rapid expansion through the conquest of the Khazars of the Pontic steppe and the invasion of the Balkans. By the end of his short life, Sviatoslav carved out for himself the largest state in Europe, eventually moving his capital from Kiev to Pereyaslavets on the Danube in 969. In contrast with his mother's conversion to Christianity, Sviatoslav, like his druzhina, remained a staunch pagan. Due to his abrupt death in an ambush in 972, Sviatoslav's conquests, for the most part, were not consolidated into a functioning empire, while his failure to establish a stable succession led to a fratricidal feud among his sons, which resulted in two of his three sons being killed.
Who ruled in Prince Oleg's place following his death?
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The answer: his wife Olga

The problem: Answer a question about this article:
Due to recording mastering and manufacturing limitations, both high and low frequencies were removed from the first recorded signals by various formulae. With low frequencies, the stylus must swing a long way from side to side, requiring the groove to be wide, taking up more space and limiting the playing time of the record. At high frequencies, hiss, pops, and ticks are significant. These problems can be reduced by using equalization to an agreed standard. During recording the amplitude of low frequencies is reduced, thus reducing the groove width required, and the amplitude at high frequencies is increased. The playback equipment boosts bass and cuts treble so as to restore the tonal balance in the original signal; this also reduces the high frequency noise. Thus more music will fit on the record, and noise is reduced.
What is a limitation of low frequency recordings?
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The answer: limiting the playing time

The problem: Answer a question about this article:
The Human Development Index report of 2005 shows that there were three boroughs with a very high Human Development Index, 12 with a high HDI value (9 above .85) and one with a medium HDI value (almost high). Benito Juarez borough had the highest HDI of the country (.9510) followed by Miguel Hidalgo which came up 4th nationally with a HDI of (.9189) and Coyoacan (5th nationally) with a HDI value of (.9169). Cuajimalpa, Cuauhtemoc and Azcapotzalco had very high values; respectively .8994 (15th nationally),.8922 (23rd) and .8915 (25th).
What year was the report that said 3 boroughs had very high HDI scores?
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The answer: 2005

The problem: Answer a question about this article:
Hong Taiji died suddenly in September 1643 without a designated heir. As the Jurchens had traditionally "elected" their leader through a council of nobles, the Qing state did not have in place a clear succession system until the reign of the Kangxi Emperor. The leading contenders for power at this time were Hong Taiji's oldest son Hooge and Hong Taiji' half brother Dorgon. A compromise candidate in the person of Hong Taiji's five-year-old son, Fulin, was installed as the Shunzhi Emperor, with Dorgon as regent and de facto leader of the Manchu nation.
When did Hong Taiji die?
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The answer:
September 1643