The problem: Answer a question about this article:
After boiling, the hopped wort is now cooled, ready for the yeast. In some breweries, the hopped wort may pass through a hopback, which is a small vat filled with hops, to add aromatic hop flavouring and to act as a filter; but usually the hopped wort is simply cooled for the fermenter, where the yeast is added. During fermentation, the wort becomes beer in a process which requires a week to months depending on the type of yeast and strength of the beer. In addition to producing ethanol, fine particulate matter suspended in the wort settles during fermentation. Once fermentation is complete, the yeast also settles, leaving the beer clear.
What substance is added to hopped wort once it cools after boiling? 
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The answer: yeast


The problem: Answer a question about this article:
Archaeological evidence shows that Homo erectus lived in the region now known as Myanmar as early as 400,000 years ago. The first evidence of Homo sapiens is dated to about 11,000 BC, in a Stone Age culture called the Anyathian with discoveries of stone tools in central Myanmar. Evidence of neolithic age domestication of plants and animals and the use of polished stone tools dating to sometime between 10,000 and 6,000 BC has been discovered in the form of cave paintings near the city of Taunggyi.
What form was the evidence of ancient cultures discovered in ?
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The answer: discovered in the form of cave paintings


The problem: Answer a question about this article:
Raleigh's industrial base includes banking/financial services; electrical, medical, electronic and telecommunications equipment; clothing and apparel; food processing; paper products; and pharmaceuticals. Raleigh is part of North Carolina's Research Triangle, one of the country's largest and most successful research parks, and a major center in the United States for high-tech and biotech research, as well as advanced textile development. The city is a major retail shipping point for eastern North Carolina and a wholesale distributing point for the grocery industry.
Is the city concerned with shipping?
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The answer: The city is a major retail shipping point


The problem: Answer a question about this article:
In terms of school casualties, thousands of school children died due to shoddy construction. In Mianyang City, seven schools collapsed, burying at least 1,700 people. At least 7,000 school buildings throughout the province collapsed. Another 700 students were buried in a school in Hanwang. At least 600 students and staff died at Juyuan Elementary School. Up to 1,300 children and teachers died at Beichuan Middle School.
How many schools collapsed in Mianyang City
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The answer:
seven