In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: Columbus made four voyages to the west between 1492 and 1504 in his vain search for a sea route to Asia. The mystery of why he failed to find it haunted him and filled him with sadness. Wherever he went to Cuba, Puerto Rico, Jamaica, South America, Panama, down the coast of Central America--it was always the same story. Instead of golden palaces, there were grass huts and palm-leaf tents. Instead of silk-robed merchant princes, he found "Indians" who did not have so much as a shirt on their backs. When Columbus explored the West Indies in 1493,he heard tales of a fierce Indian tribe who literally devoured its defeated enemies after a battle. These people were called by many names in the area, including Calina, Canima, Carib, and Caniba. Columbus recorded the name of the American natives as Canibales in Spanish, a word which came to refer, within a few years, to any eater of human flesh. In the similar fashion, the word Caribbean, a title for the sea as well as for the region, came into English. At times Columbus knew that this new land was not China, not Japan, not the Spice Islands. He seemed to accept it as a part of the earth that the geographers of Europe had never heard of before. It was another world--and he called it exactly that--but Columbus also insisted until he died that land he had reached was an unknown part of Asia.
Answer: Columbus' voyages
What is the best title for this text?

Article: Researchers around the world have been trying their hand at making better use of the huge amount of wind energy available in nature to produce clean energy. Apart from this, studies are being carried out to harness usable wind energy produced by man-made technologies. One useful source identified by Indian inventor Santosh Pradhan about two years ago is a speeding train, which produces fierce wind that can be transformed into electricity. According to Pradhan's proposal, with a few small improvements in existing trains running in Mumbai, the largest city in India, at least 10,000 megawatts of electricity could be harvested each day. Building on this principle, designers Ale Leonetti Luparinia and Qian Jiang from Yanko Design have created a device called T-Box that harnesses wind energy from speeding trains. T-Box can be placed within the railway tracks. It is half-buried underground between the concrete sleepers , which does not disturb the normal train operating at all. According to Yanko, around 150 T-Boxes can be fitted along a 1,000-meter railway track. A train running at a speed of 200 kph can produce winds blowing at 15 miles a second. Based on this calculation, 150 T-Boxes can produce 2.6 KWH of electricity per day. The T-Box's design won a silver medal in last year's Lite-On Awards and was exhibited last summer at the Xue Xue Institute in Taipei, Taiwan Province. Though the figures look impressive, it is important to remember that the design is still at a conceptual stage and hasn't taken into account issues such as pieces of waste material produced by the device and the efforts and costs involved in the maintenance of the device. We can expect the technology to see the light of the day only after it clears these issues. If so, rail travel, one of the greenest forms of travel, will become greener and more energy-efficient.
Answer: It is based on Pradhan's idea.
What can we learn about T-Box?

Article: Can a Language Become Extinct? A language can become extinct when the last person who can speak it passes away. Or more likely when the secondlast person who speaks it dies because then there is no one left to talk to. According to linguists there is nothing unusual about a single language dying out. But what is happening today is quite remarkable. According to the recent statistics, there are approximately 6,000 languages in the world as we speak. Of these, about half are going to die out in the next century. There are several reasons as to why a language can eventually die out. These range from natural disasters, such as hurricanes, to sociological factors, like cultural assimilation, in which the culture of a minority group is gradually replaced by a stronger one. The former can cause tribes to leave their natural habitat and therefore become fewer and fewer in number. However, it doesn't happen very frequently. In fact, the latter is a much bigger threat and it is responsible for the extinction of a lot of languages in countries like the USA and Australia. For instance, Chemehuevi is one of the languages which is really close to dying out since its sole speaker is an old, yet healthy, man named Johnny Hill, Jr. It is very important for as many languages as possible to be preserved. Scientists have been trying to raise people's awareness on how certain tribes have specific words which cannot be expressed in let's say English simply because there is no equal meaning. Namely, the Yupik of Alaska have 99 names to describe different layers of ice formation, or how the Tofa of Siberia classify reindeer . In other words, when languages die out, mankind's wisdom reduces. On a happier note, there are many famous cases which show what can be done to preserve languages in danger of extinction. In particular, the Maori in New Zealand have created socalled "language nests": organizations which help children under five learn the language. They provide them with a setting where they are exposed to the language intensively so that they get to realise that communicating in Maori is as natural as communicating in English. There is always, of course, the risk that the children won't keep the language alive after they have left their "nests". Nevertheless, hope dies hard.
Answer: Foreign languages were spoken.
What most probably caused the death of languages in the USA and Australia?