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.

Q: 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.

A: What can we learn about T-Box?
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Q: Article: Born on April 4, 1928, Maya Angelou had a hard childhood. Her parents got divorced when she was very young. She was a single mother and being a single mother was very hard on her. It was finally in 1949 that she started to find her place in the world when she changed her name to show her Calypso dance performances at the night club where she worked. It was there that she won a scholarship and trained in African dance and modern dance. She formed a group and they traveled all over Europe with an opera production. As she traveled, she studied different languages and became excellent in several of them. During this time, she made her first album, Miss Calypso, and it was a success. In the 1950s, she moved to New York and started to work more on her writing. She heard Dr Martin Luther King speak in 1960 and began organizing different benefits for Civil Rights . In 1961, she began to play a large role in the Civil Rights Movement and is remembered for her work around the country. She later moved to Ghana with her son and worked in the University of Ghana's School of Music and Drama. It was there that she became close friends with Malcolm X. She returned to the US in 1964 to help Malcolm X with a new Civil Rights movement. Shortly after she returned to the US, Malcolm X and Dr King were both assassinated . To deal with the deaths of her friends, she wrote her first book, I Know Why the Caged Bird Sings, which finally made her famous around the world. The 1970s were some of her most productive years as a writer, poet, as well as a singer.
Answer: Maya Angelou: a life of hard work and success

A: What's the main idea of this passage?
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Answer: Students of the French language.

A:
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