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The advent of the Industrial Revolution in Britain provided a great boost to cotton manufacture, as textiles emerged as Britain's leading export. In 1738, Lewis Paul and John Wyatt, of Birmingham, England, patented the roller spinning machine, as well as the flyer-and-bobbin system for drawing cotton to a more even thickness using two sets of rollers that traveled at different speeds. Later, the invention of the James Hargreaves' spinning jenny in 1764, Richard Arkwright's spinning frame in 1769 and Samuel Crompton's spinning mule in 1775 enabled British spinners to produce cotton yarn at much higher rates. From the late 18th century on, the British city of Manchester acquired the nickname "Cottonopolis" due to the cotton industry's omnipresence within the city, and Manchester's role as the heart of the global cotton trade.
What device did Manchester invent?
A: unanswerable

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An example of mutual symbiosis is the relationship between the ocellaris clownfish that dwell among the tentacles of Ritteri sea anemones. The territorial fish protects the anemone from anemone-eating fish, and in turn the stinging tentacles of the anemone protect the clownfish from its predators. A special mucus on the clownfish protects it from the stinging tentacles.
What lives with Ritteri sea anemones?
A: ocellaris clownfish

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A narthex (a portico or entrance hall) for the west front was designed by Sir Edwin Lutyens in the mid-20th century but was not built. Images of the abbey prior to the construction of the towers are scarce, though the abbey's official website states that the building was without towers following Yevele's renovation, with just the lower segments beneath the roof level of the Nave completed.
What was redesigned for the west front of the abbey but not built?
A: unanswerable

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Eisenhower, as well as the officers and troops under him, had learned valuable lessons in their previous operations, and their skills had all strengthened in preparation for the next most difficult campaign against the Germansa beach landing assault. His first struggles, however, were with Allied leaders and officers on matters vital to the success of the Normandy invasion; he argued with Roosevelt over an essential agreement with De Gaulle to use French resistance forces in covert and sabotage operations against the Germans in advance of Overlord. Admiral Ernest J. King fought with Eisenhower over King's refusal to provide additional landing craft from the Pacific. He also insisted that the British give him exclusive command over all strategic air forces to facilitate Overlord, to the point of threatening to resign unless Churchill relented, as he did. Eisenhower then designed a bombing plan in France in advance of Overlord and argued with Churchill over the latter's concern with civilian casualties; de Gaulle interjected that the casualties were justified in shedding the yoke of the Germans, and Eisenhower prevailed. He also had to skillfully manage to retain the services of the often unruly George S. Patton, by severely reprimanding him when Patton earlier had slapped a subordinate, and then when Patton gave a speech in which he made improper comments about postwar policy.
What did Patton do that first caused Eisenhower to reprimand him?
A:
slapped a subordinate