Article: To prevent the risk of out-of-phase supplies mixing, sections of line fed from different feeder stations must be kept strictly isolated. This is achieved by Neutral Sections (also known as Phase Breaks), usually provided at feeder stations and midway between them although, typically, only half are in use at any time, the others being provided to allow a feeder station to be shut down and power provided from adjacent feeder stations. Neutral Sections usually consist of an earthed section of wire which is separated from the live wires on either side by insulating material, typically ceramic beads, designed so that the pantograph will smoothly run from one section to the other. The earthed section prevents an arc being drawn from one live section to the other, as the voltage difference may be higher than the normal system voltage if the live sections are on different phases and the protective circuit breakers may not be able to safely interrupt the considerable current that would flow. To prevent the risk of an arc being drawn across from one section of wire to earth, when passing through the neutral section, the train must be coasting and the circuit breakers must be open. In many cases, this is done manually by the drivers. To help them, a warning board is provided just before both the neutral section and an advance warning some distance before. A further board is then provided after the neutral section to tell drivers to re-close the circuit breaker, although drivers must not do this until the rear pantograph has passed this board. In the UK, a system known as Automatic Power Control (APC) automatically opens and closes the circuit breaker, this being achieved by using sets of permanent magnets alongside the track communicating with a detector on the train. The only action needed by the driver is to shut off power and coast and therefore warning boards are still provided at and on the approach to neutral sections.

Question: What was the main requirement for electric feeder stations?
Ans: line fed from different feeder stations must be kept strictly isolated

Here is a question about this article: St. Barthelemy has about 25 hotels, most of them with 15 rooms or fewer. The largest has 58 rooms. Hotels are classified in the traditional French manner; 3 Star, 4 Star and 4 Star Luxe. Of particular note are Eden Rock and Cheval Blanc. Hotel Le Toiny, the most expensive hotel on the island, has 12 rooms. Most places of accommodation are in the form of private villas, of which there are some 400 available to rent on the island. The island's tourism industry, though expensive, attracts 70,000 visitors every year to its luxury hotels and villas and another 130,000 people arrive by luxury boats. It also attracts a labour force from Brazil and Portugal to meet the industry needs.
What is the answer to this question: How many rooms does the most expensive hotel on the island have?
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So... 12

The problem: Answer a question about this article:
During its formative period, the term madrasah referred to a higher education institution, whose curriculum initially included only the "religious sciences", whilst philosophy and the secular sciences were often excluded. The curriculum slowly began to diversify, with many later madaris teaching both the religious and the "secular sciences", such as logic, mathematics and philosophy. Some madaris further extended their curriculum to history, politics, ethics, music, metaphysics, medicine, astronomy and chemistry. The curriculum of a madrasah was usually set by its founder, but most generally taught both the religious sciences and the physical sciences. Madaris were established throughout the Islamic world, examples being the 9th century University of al-Qarawiyyin, the 10th century al-Azhar University (the most famous), the 11th century Nizamiyah, as well as 75 madaris in Cairo, 51 in Damascus and up to 44 in Aleppo between 1155 and 1260. Many more were also established in the Andalusian cities of Cordoba, Seville, Toledo, Granada (Madrasah of Granada), Murcia, Almeria, Valencia and Cadiz during the Caliphate of Cordoba.
What discipline was studied in traditional madrasah?
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The answer: religious sciences

Problem: Please answer a question about the following article about Database:
In recent years there was a high demand for massively distributed databases with high partition tolerance but according to the CAP theorem it is impossible for a distributed system to simultaneously provide consistency, availability and partition tolerance guarantees. A distributed system can satisfy any two of these guarantees at the same time, but not all three. For that reason many NoSQL databases are using what is called eventual consistency to provide both availability and partition tolerance guarantees with a reduced level of data consistency.
How many guarantees will most databases tolerate?
A: two

Question: Read this and answer the question

In 2007, the USAF undertook a Reduction-in-Force (RIF). Because of budget constraints, the USAF planned to reduce the service's size from 360,000 active duty personnel to 316,000. The size of the active duty force in 2007 was roughly 64% of that of what the USAF was at the end of the first Gulf War in 1991. However, the reduction was ended at approximately 330,000 personnel in 2008 in order to meet the demand signal of combatant commanders and associated mission requirements. These same constraints have seen a sharp reduction in flight hours for crew training since 2005 and the Deputy Chief of Staff for Manpower and Personnel directing Airmen's Time Assessments.

What has there been a sharp reduction in during the years following 2005 in the USAF?
Answer: flight hours for crew training

Some succeeded their fathers as rulers, such as Sultan Ahmad al-Mansur, who ruled Morocco from 1578 to 1608. He was not technically considered as a mixed-race child of a slave; his mother was Fulani and a concubine of his father. Such tolerance for black persons, even when technically "free", was not so common in Morocco. The long association of sub-Saharan peoples as slaves is shown in the term abd (Arabic: ,) (meaning "slave"); it is still frequently used in the Arabic-speaking world as a term for black people.
Who was the ruler in Morocco?
Sultan Ahmad al-Mansur