Input: Solar energy
Shuman built the world's first solar thermal power station in Maadi, Egypt, between 1912 and 1913. Shuman's plant used parabolic troughs to power a 4552 kilowatts (6070 hp) engine that pumped more than 22,000 litres (4,800 imp gal; 5,800 US gal) of water per minute from the Nile River to adjacent cotton fields. Although the outbreak of World War I and the discovery of cheap oil in the 1930s discouraged the advancement of solar energy, Shuman's vision and basic design were resurrected in the 1970s with a new wave of interest in solar thermal energy. In 1916 Shuman was quoted in the media advocating solar energy's utilization, saying:

From what river did the engine pump water?
Output: Nile River

Input: Article: West's first six solo studio albums, all of which have gone platinum, have received numerous awards and critical acclaim. All of his albums have been commercially successful, with Yeezus, his sixth solo album, becoming his fifth consecutive No. 1 album in the U.S. upon release. West has had six songs exceed 3 million in digital sales as of December 2012, with "Gold Digger" selling 3,086,000, "Stronger" selling 4,402,000, "Heartless" selling 3,742,000, "E.T." selling over 4,000,000, "Love Lockdown" selling over 3,000,000, and "Niggas in Paris" selling over 3,000,000, placing him third in overall digital sales of the past decade. He has sold over 30 million digital songs in the United States making him one of the best-selling digital artists of all-time.

Now answer this question: How many total digital songs has Kanye West sold in the US?

Output: 30 million

Article: The papacy further refined the practice in the Mass in the Late Middle Ages, holding that the clergy alone was allowed to partake of the wine in the Eucharist. This further distanced the secular laity from the clergy. The laity continued the practices of pilgrimages, veneration of relics, and belief in the power of the Devil. Mystics such as Meister Eckhart (d. 1327) and Thomas a Kempis (d. 1471) wrote works that taught the laity to focus on their inner spiritual life, which laid the groundwork for the Protestant Reformation. Besides mysticism, belief in witches and witchcraft became widespread, and by the late 15th century the Church had begun to lend credence to populist fears of witchcraft with its condemnation of witches in 1484 and the publication in 1486 of the Malleus Maleficarum, the most popular handbook for witch-hunters.

Question: When did Thomas a Kempis die?
Ans: 1471

Here is a question about this article: The 18th century saw a huge growth in the number of drinking establishments, primarily due to the introduction of gin. Gin was brought to England by the Dutch after the Glorious Revolution of 1688 and became very popular after the government created a market for "cuckoo grain" or "cuckoo malt" that was unfit to be used in brewing and distilling by allowing unlicensed gin and beer production, while imposing a heavy duty on all imported spirits. As thousands of gin-shops sprang up all over England, brewers fought back by increasing the number of alehouses. By 1740 the production of gin had increased to six times that of beer and because of its cheapness it became popular with the poor, leading to the so-called Gin Craze. Over half of the 15,000 drinking establishments in London were gin shops.
What is the answer to this question: In what year did the Glorious Revolution occur?
****
So... 1688

The problem: Answer a question about this article:
The baroque style had never truly been to the English taste. Four influential books were published in the first quarter of the 18th century which highlighted the simplicity and purity of classical architecture: Vitruvius Britannicus (Colen Campbell 1715), Palladio's Four Books of Architecture (1715), De Re Aedificatoria (1726) and The Designs of Inigo Jones... with Some Additional Designs (1727). The most popular was the four-volume Vitruvius Britannicus by Colen Campbell. The book contained architectural prints of famous British buildings that had been inspired by the great architects from Vitruvius to Palladio. At first the book mainly featured the work of Inigo Jones, but the later tomes contained drawings and plans by Campbell and other 18th-century architects. Palladian architecture became well established in 18th-century Britain.
In what century did Palladian architecture become well established?
****
The answer: 18th-century

The problem: Answer a question about this article:
Zhejiang was the site of the Neolithic cultures of the Hemudu and Liangzhu. A 2007 analysis of the DNA recovered from human remains in the archeological sites of prehistoric peoples along the Yangtze River shows high frequencies of haplogroup O1 in the Liangzhu culture, linking them to Austronesian and Tai-Kadai peoples.
What haplogroup did a DNA analysis of the Liangzhu culture reveal?
****
The answer:
O1