Problem: Viking invasions began in the 9th century, followed by more permanent settlements, particularly along the east coast of Ireland, the west coast of modern-day Scotland and the Isle of Man. Though the Vikings were eventually neutralised in Ireland, their influence remained in the cities of Dublin, Cork, Limerick, Waterford and Wexford. England however was slowly conquered around the turn of the first millennium AD, and eventually became a feudal possession of Denmark. The relations between the descendants of Vikings in England and counterparts in Normandy, in northern France, lay at the heart of a series of events that led to the Norman conquest of England in 1066. The remnants of the Duchy of Normandy, which conquered England, remain associated to the English Crown as the Channel Islands to this day. A century later the marriage of the future Henry II of England to Eleanor of Aquitaine created the Angevin Empire, partially under the French Crown. At the invitation of a provincial king and under the authority of Pope Adrian IV (the only Englishman to be elected pope), the Angevins invaded Ireland in 1169. Though initially intended to be kept as an independent kingdom, the failure of the Irish High King to ensure the terms of the Treaty of Windsor led Henry II, as King of England, to rule as effective monarch under the title of Lord of Ireland. This title was granted to his younger son but when Henry's heir unexpectedly died the title of King of England and Lord of Ireland became entwined in one person.
The Norman conquest of Spain took place during which year?
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Answer: unanswerable

Problem: In cosmology and astronomy the phenomena of stars, nova, supernova, quasars and gamma-ray bursts are the universe's highest-output energy transformations of matter. All stellar phenomena (including solar activity) are driven by various kinds of energy transformations. Energy in such transformations is either from gravitational collapse of matter (usually molecular hydrogen) into various classes of astronomical objects (stars, black holes, etc.), or from nuclear fusion (of lighter elements, primarily hydrogen). The nuclear fusion of hydrogen in the Sun also releases another store of potential energy which was created at the time of the Big Bang. At that time, according to theory, space expanded and the universe cooled too rapidly for hydrogen to completely fuse into heavier elements. This meant that hydrogen represents a store of potential energy that can be released by fusion. Such a fusion process is triggered by heat and pressure generated from gravitational collapse of hydrogen clouds when they produce stars, and some of the fusion energy is then transformed into sunlight.
What is driven by various kinds of energy transfusions?
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Answer: unanswerable

Problem: As of 2013, West has won a total of 21 Grammy Awards, making him one of the most awarded artists of all-time. About.com ranked Kanye West No. 8 on their "Top 50 Hip-Hop Producers" list. On May 16, 2008, Kanye West was crowned by MTV as the year's No. 1 "Hottest MC in the Game." On December 17, 2010, Kanye West was voted as the MTV Man of the Year by MTV. Billboard ranked Kanye West No. 3 on their list of Top 10 Producers of the Decade. West ties with Bob Dylan for having topped the annual Pazz & Jop critic poll the most number of times ever, with four number-one albums each. West has also been included twice in the Time 100 annual lists of the most influential people in the world as well as being listed in a number of Forbes annual lists.
What rank did About.com give Kanye "Top 50 Hip-Hop Producers" list?
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Answer:
8