Here is a question about this article: Network effects are a large factor with electrification. When converting lines to electric, the connections with other lines must be considered. Some electrifications have subsequently been removed because of the through traffic to non-electrified lines. If through traffic is to have any benefit, time consuming engine switches must occur to make such connections or expensive dual mode engines must be used. This is mostly an issue for long distance trips, but many lines come to be dominated by through traffic from long-haul freight trains (usually running coal, ore, or containers to or from ports). In theory, these trains could enjoy dramatic savings through electrification, but it can be too costly to extend electrification to isolated areas, and unless an entire network is electrified, companies often find that they need to continue use of diesel trains even if sections are electrified. The increasing demand for container traffic which is more efficient when utilizing the double-stack car also has network effect issues with existing electrifications due to insufficient clearance of overhead electrical lines for these trains, but electrification can be built or modified to have sufficient clearance, at additional cost.
What is the answer to this question: Where can the issue of through traffic benefits occur?
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So... long distance trips


The problem: Answer a question about this article:
The PlayStation 3 Slim received extremely positive reviews as well as a boost in sales; less than 24 hours after its announcement, PS3 Slim took the number-one bestseller spot on Amazon.com in the video games section for fifteen consecutive days. It regained the number-one position again one day later. PS3 Slim also received praise from PC World giving it a 90 out of 100 praising its new repackaging and the new value it brings at a lower price as well as praising its quietness and the reduction in its power consumption. This is in stark contrast to the original PS3's launch in which it was given position number-eight on their "The Top 21 Tech Screwups of 2006" list.
With a day of its release, on what website did the PS3 Slim become the number-one bestseller?
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The answer: Amazon.com


Problem: Please answer a question about the following article about Race (human categorization):
Today, all humans are classified as belonging to the species Homo sapiens and sub-species Homo sapiens sapiens. However, this is not the first species of homininae: the first species of genus Homo, Homo habilis, are theorized to have evolved in East Africa at least 2 million years ago, and members of this species populated different parts of Africa in a relatively short time. Homo erectus is theorized to have evolved more than 1.8 million years ago, and by 1.5 million years ago had spread throughout Europe and Asia. Virtually all physical anthropologists agree that Archaic Homo sapiens (A group including the possible species H. heidelbergensis, H. rhodesiensis and H. neanderthalensis) evolved out of African Homo erectus ((sensu lato) or Homo ergaster).
When is it theorized that Homo habilis evolved in East Africa?
A: 2 million years ago


Question: Read this and answer the question

The almost constant wars among the Sumerian city-states for 2000 years helped to develop the military technology and techniques of Sumer to a high level. The first war recorded in any detail was between Lagash and Umma in c. 2525 BC on a stele called the Stele of the Vultures. It shows the king of Lagash leading a Sumerian army consisting mostly of infantry. The infantrymen carried spears, wore copper helmets, and carried rectangular shields. The spearmen are shown arranged in what resembles the phalanx formation, which requires training and discipline; this implies that the Sumerians may have made use of professional soldiers.

What contributed to developing military technology for Sumer?
Answer: almost constant wars


Problem: The interior of Galicia is characterized by its hilly landscape, although mountain ranges rise to 2,000 m (6,600 ft) in the east and south. The coastal areas are mostly an alternate series of rías (submerged valleys where the sea penetrates tens of kilometres inland) and cliffs. The climate of Galicia is temperate and rainy, but it is also markedly drier in the summer, being usually classified as Oceanic in the west and north, and Mediterranean in the southeast. Its topographic and climatic conditions have made animal husbandry and farming the primary source of Galicia's wealth for most of its history. With the exception of shipbuilding and food processing, Galicia was largely a semi-subsistence farming and fishing economy and did not experience significant industrialization until after the mid-20th century. In 2012, the gross domestic product at purchasing power parity was €56,000 million, with a nominal GDP per capita of €20,700. The population is largely concentrated in two coastal areas: from Ferrol to A Coruña in the northwest and from Pontevedra to Vigo in the southwest. To a lesser extent, there are smaller populations around the interior cities of Lugo, Ourense and Santiago de Compostela. The political capital is Santiago de Compostela, in the province of A Coruña. Vigo, in the province of Pontevedra, is the most populous municipality with 294,997 (2014), while A Coruña is the most populous city with 215.227 (2014).
How high does Galicia's mountain ranges rise?
The answer is the following: 2,000 m (6,600 ft)


Input: Article: In 1979, the Japanese state broadcaster NHK first developed consumer high-definition television with a 5:3 display aspect ratio. The system, known as Hi-Vision or MUSE after its Multiple sub-Nyquist sampling encoding for encoding the signal, required about twice the bandwidth of the existing NTSC system but provided about four times the resolution (1080i/1125 lines). Satellite test broadcasts started in 1989, with regular testing starting in 1991 and regular broadcasting of BS-9ch commencing on November 25, 1994, which featured commercial and NHK programming.

Now answer this question: Who first developed consumer HD television with a 5:3 aspect ratio?

Output:
the Japanese state broadcaster NHK