Problem: Airport:

Many ground crew at the airport work at the aircraft. A tow tractor pulls the aircraft to one of the airbridges, The ground power unit is plugged in. It keeps the electricity running in the plane when it stands at the terminal. The engines are not working, therefore they do not generate the electricity, as they do in flight. The passengers disembark using the airbridge. Mobile stairs can give the ground crew more access to the aircraft's cabin. There is a cleaning service to clean the aircraft after the aircraft lands. Flight catering provides the food and drinks on flights. A toilet waste truck removes the human waste from the tank which holds the waste from the toilets in the aircraft. A water truck fills the water tanks of the aircraft. A fuel transfer vehicle transfers aviation fuel from fuel tanks underground, to the aircraft tanks. A tractor and its dollies bring in luggage from the terminal to the aircraft. They also carry luggage to the terminal if the aircraft has landed, and is being unloaded. Hi-loaders lift the heavy luggage containers to the gate of the cargo hold. The ground crew push the luggage containers into the hold. If it has landed, they rise, the ground crew push the luggage container on the hi-loader, which carries it down. The luggage container is then pushed on one of the tractors dollies. The conveyor, which is a conveyor belt on a truck, brings in the awkwardly shaped, or late luggage. The airbridge is used again by the new passengers to embark the aircraft. The tow tractor pushes the aircraft away from the terminal to a taxi area. The aircraft should be off of the airport and in the air in 90 minutes. The airport charges the airline for the time the aircraft spends at the airport.

How long should it take for an aircraft to be off the airport and in the air?
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A: 90 minutes

Problem: One way to decrease stigma may be through the promotion of "TB clubs", where those infected may share experiences and offer support, or through counseling. Some studies have shown TB education programs to be effective in decreasing stigma, and may thus be effective in increasing treatment adherence. Despite this, studies on relationship between reduced stigma and mortality are lacking as of 2010, and similar efforts to decrease stigma surrounding AIDS have been minimally effective. Some have claimed the stigma to be worse than the disease, and healthcare providers may unintentionally reinforce stigma, as those with TB are often perceived as difficult or otherwise undesirable. A greater understanding of the social and cultural dimensions of tuberculosis may also help with stigma reduction.
What group of people can add to the TB stigma by treating patients as troublesome or unwanted?
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Answer: healthcare providers

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Since incandescent light bulbs use more energy than alternatives such as CFLs and LED lamps, many governments have introduced measures to ban their use, by setting minimum efficacy standards higher than can be achieved by incandescent lamps. Measures to ban light bulbs have been implemented in the European Union, the United States, Russia, Brazil, Argentina, Canada and Australia, among others. In the Europe the EC has calculated that the ban contributes 5 to 10 billion euros to the economy and saves 40 TWh of electricity every year, translating in CO2 emission reductions of 15 million tonnes.
How much does the incandescent light ban in Europe contribute to the economy each year?
A: 5 to 10 billion euros

Context and question: Copper is biostatic, meaning bacteria will not grow on it. For this reason it has long been used to line parts of ships to protect against barnacles and mussels. It was originally used pure, but has since been superseded by Muntz metal. Similarly, as discussed in copper alloys in aquaculture, copper alloys have become important netting materials in the aquaculture industry because they are antimicrobial and prevent biofouling, even in extreme conditions and have strong structural and corrosion-resistant properties in marine environments.
Because of copper's biostatic properties where is a common use for copper?
Answer: ships

Question: By 1820, Charleston's population had grown to 23,000, maintaining its black (and mostly slave) majority. When a massive slave revolt planned by Denmark Vesey, a free black, was revealed in May 1822, whites reacted with intense fear, as they were well aware of the violent retribution of slaves against whites during the Haitian Revolution. Soon after, Vesey was tried and executed, hanged in early July with five slaves. Another 28 slaves were later hanged. Later, the state legislature passed laws requiring individual legislative approval for manumission (the freeing of a slave) and regulating activities of free blacks and slaves.
Is there an answer to this question: What revolution made blacks fearful of retribution of slaves?

Answer: unanswerable

QUES: The crisis deepened during the 17th century with the expulsion in 1609 of the Jews and the Moriscos, descendants of the Muslim population that converted to Christianity under threat of exile from Ferdinand and Isabella in 1502. From 1609 through 1614, the Spanish government systematically forced Moriscos to leave the kingdom for Muslim North Africa. They were concentrated in the former Kingdom of Aragon, where they constituted a fifth of the population, and the Valencia area specifically, where they were roughly a third of the total population. The expulsion caused the financial ruin of some of the nobility and the bankruptcy of the Taula de Canvi in 1613. The Crown endeavoured to compensate the nobles, who had lost much of their agricultural labour force; this harmed the economy of the city for generations to come. Later, during the so-called Catalan Revolt (16401652), Valencia contributed to the cause of Philip IV with militias and money, resulting in a period of further economic hardship exacerbated by the arrival of troops from other parts of Spain.

What proportion of the Valencia area's population were the Moriscos?
What is the answer?
ANS:
a third