Problem: Into the first half of the twentieth century after the establishment of ROC, Nanjing gradually shifted from being a production hub towards being a heavy consumption city, mainly because of the rapid expansion of its wealthy population after Nanjing once again regained the political spotlight of China. A number of huge department stores such as Zhongyang Shangchang sprouted up, attracting merchants from all over China to sell their products in Nanjing. In 1933, the revenue generated by the food and entertainment industry in the city exceeded the sum of the output of the manufacturing and agriculture industry. One third of the city population worked in the service industry, .
In what year did the revenue of food and entertainment eclipse the output of industry?
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Answer: 1933

Problem: Whitehead and Russell had thought originally that Principia Mathematica would take a year to complete; it ended up taking them ten years. To add insult to injury, when it came time for publication, the three-volume work was so massive (more than 2,000 pages) and its audience so narrow (professional mathematicians) that it was initially published at a loss of 600 pounds, 300 of which was paid by Cambridge University Press, 200 by the Royal Society of London, and 50 apiece by Whitehead and Russell themselves. Despite the initial loss, today there is likely no major academic library in the world which does not hold a copy of Principia Mathematica.
Who didn't supply the funding to cover the shortfall?
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Answer: unanswerable

Problem: When their migratory movements ended, there appeared among the Slavs the first rudiments of state organizations, each headed by a prince with a treasury and a defense force. Moreover, it was the beginnings of class differentiation, and nobles pledged allegiance either to the Frankish/ Holy Roman Emperors or the Byzantine Emperors.
What two things did each noble have?
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Answer:
unanswerable