Question: In the late 14th century, the Songhai gradually gained independence from the Mali Empire and expanded, ultimately subsuming the entire eastern portion of the Mali Empire. The Songhai Empire's eventual collapse was largely the result of a Moroccan invasion in 1591, under the command of Judar Pasha. The fall of the Songhai Empire marked the end of the region's role as a trading crossroads. Following the establishment of sea routes by the European powers, the trans-Saharan trade routes lost significance.
Is there an answer to this question: What marked the beginning of the region's role as a trading crossroads?

Answer: unanswerable


Question: First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment of energy, E, of a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the frequency, f, of its associated electromagnetic wave. In 1905 the value E, the minimal energy increment of a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.
Is there an answer to this question: Which scientist associated the Planck constant with a quantum five years after Planck's recognition?

Answer: Einstein


Question: In the north, the Republic of Novgorod prospered because it controlled trade routes from the River Volga to the Baltic Sea. As Kievan Rus' declined, Novgorod became more independent. A local oligarchy ruled Novgorod; major government decisions were made by a town assembly, which also elected a prince as the city's military leader. In the 12th century, Novgorod acquired its own archbishop Ilya in 1169, a sign of increased importance and political independence, while about 30 years prior to that in 1136 in Novgorod was established a republican form of government - elective monarchy. Since then Novgorod enjoyed a wide degree of autonomy although being closely associated with the Kievan Rus.
Is there an answer to this question: What was a sign of decreased important and political independence?

Answer: unanswerable


Question: In 1992, the First Division clubs resigned from the Football League en masse and on 27 May 1992 the FA Premier League was formed as a limited company working out of an office at the Football Association's then headquarters in Lancaster Gate. This meant a break-up of the 104-year-old Football League that had operated until then with four divisions; the Premier League would operate with a single division and the Football League with three. There was no change in competition format; the same number of teams competed in the top flight, and promotion and relegation between the Premier League and the new First Division remained the same as the old First and Second Divisions with three teams relegated from the league and three promoted.
Is there an answer to this question: The Football League would have a single division and the Premier league would have how many?

Answer:
unanswerable