The problem: Answer a question about this article:
In 1838 the situation was slightly the same as in 1831. Muhammad Ali of Egypt was not happy about lack of his control and power in Syria, he resumed military actions. The Ottoman army lost to Egyptians at the Battle of Nezib on June 24, 1839. The Ottoman Empire was saved by Great Britain, Austria, Prussia and Russia by signing a convention in London in July 15, 1840 to grant Muhammad Ali and his descendants the right to inherit power in Egypt in exchange for removal of Egyptian military forces from Syria and Lebanon. Moreover, Muhammad Ali had to admit a formal dependence from the Ottoman sultan. After Muhammad Ali refused to obey the requirements of the London convention, the allied Anglo-Austrian fleet blocked the Delta, bombarded Beirut and captured Acre. Muhammad Ali accepted the conditions of the London convention in 1840.
In what year did Muhammad Ali  finally accept the terms of the London convention?
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The answer: 1840


Problem: Please answer a question about the following article about John Kerry:
In the lead up to the Iraq War, Kerry said on October 9, 2002; "I will be voting to give the President of the United States the authority to use force, if necessary, to disarm Saddam Hussein because I believe that a deadly arsenal of weapons of mass destruction in his hands is a real and grave threat to our security." Bush relied on that resolution in ordering the 2003 invasion of Iraq. Kerry also gave a January 23, 2003 speech to Georgetown University saying "Without question, we need to disarm Saddam Hussein. He is a brutal, murderous dictator; leading an oppressive regime he presents a particularly grievous threat because he is so consistently prone to miscalculation. So the threat of Saddam Hussein with weapons of mass destruction is real." Kerry did, however, warn that the administration should exhaust its diplomatic avenues before launching war: "Mr. President, do not rush to war, take the time to build the coalition, because it's not winning the war that's hard, it's winning the peace that's hard."
When did Kerry speak at Georgetown University?
A: January 23, 2003


Question: Read this and answer the question

West has been an outspoken and controversial celebrity throughout his career, receiving both criticism and praise from many, including the mainstream media, other artists and entertainers, and two U.S. presidents. On September 2, 2005, during a benefit concert for Hurricane Katrina relief on NBC, A Concert for Hurricane Relief, West (a featured speaker) accused President George W. Bush of not "car[ing] about black people". When West was presenting alongside actor Mike Myers, he deviated from the prepared script to criticize the media's portrayal of hurricane victims, saying:

On what day did the Kanye's famous George W. Bush criticism take place?
Answer: September 2, 2005


Problem: Historically, AC motors were used for single or double speed elevator machines on the grounds of cost and lower usage applications where car speed and passenger comfort were less of an issue, but for higher speed, larger capacity elevators, the need for infinitely variable speed control over the traction machine becomes an issue. Therefore, DC machines powered by an AC/DC motor generator were the preferred solution. The MG set also typically powered the relay controller of the elevator, which has the added advantage of electrically isolating the elevators from the rest of a building's electrical system, thus eliminating the transient power spikes in the building's electrical supply caused by the motors starting and stopping (causing lighting to dim every time the elevators are used for example), as well as interference to other electrical equipment caused by the arcing of the relay contactors in the control system.
What problem arises for fast and large capacity elevators?
The answer is the following: the need for infinitely variable speed control over the traction machine


Part of the Haunted Mansion attraction at Disneyland in Anaheim, California, and Disneyland in Paris, France, takes place on an elevator. The "stretching room" on the ride is actually an elevator that travels downwards, giving access to a short underground tunnel which leads to the rest of the attraction. The elevator has no ceiling and its shaft is decorated to look like walls of a mansion. Because there is no roof, passengers are able to see the walls of the shaft by looking up, which gives the illusion of the room stretching.
What is included in the elevator's design?
The elevator has no ceiling and its shaft is decorated to look like walls of a mansion


Here is a question about this article: Muslim engineers in the Islamic world made a number of innovative industrial uses of hydropower, and early industrial uses of tidal power and wind power, fossil fuels such as petroleum, and early large factory complexes (tiraz in Arabic). The industrial uses of watermills in the Islamic world date back to the 7th century, while horizontal-wheeled and vertical-wheeled water mills were both in widespread use since at least the 9th century. A variety of industrial mills were being employed in the Islamic world, including early fulling mills, gristmills, hullers, sawmills, ship mills, stamp mills, steel mills, sugar mills, tide mills and windmills. By the 11th century, every province throughout the Islamic world had these industrial mills in operation, from al-Andalus and North Africa to the Middle East and Central Asia. Muslim engineers also invented crankshafts and water turbines, employed gears in mills and water-raising machines, and pioneered the use of dams as a source of water power, used to provide additional power to watermills and water-raising machines. Such advances made it possible for industrial tasks that were previously driven by manual labour in ancient times to be mechanized and driven by machinery instead in the medieval Islamic world. The transfer of these technologies to medieval Europe had an influence on the Industrial Revolution.
What is the answer to this question: In what century had mills such as gristmills and sawmills dominate the Islamic world?
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So...
11th century