The problem: Answer a question about this article:
In the semiconductor industry, infrared light can be used to characterize materials such as thin films and periodic trench structures. By measuring the reflectance of light from the surface of a semiconductor wafer, the index of refraction (n) and the extinction Coefficient (k) can be determined via the Forouhi-Bloomer dispersion equations. The reflectance from the infrared light can also be used to determine the critical dimension, depth, and sidewall angle of high aspect ratio trench structures.
What letter represents the index of refraction?
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The answer: n

The problem: Answer a question about this article:
On February 18, 2015, Canadian Transport Minister Lisa Raitt announced that Canada has agreed to pay the entire cost to build a $250 million U.S. Customs plaza adjacent to the planned new DetroitWindsor bridge, now the Gordie Howe International Bridge. Canada had already planned to pay for 95 per cent of the bridge, which will cost $2.1 billion, and is expected to open in 2020. "This allows Canada and Michigan to move the project forward immediately to its next steps which include further design work and property acquisition on the U.S. side of the border," Raitt said in a statement issued after she spoke in the House of Commons.
How much is the U.S. Customs plaza expected to cost?
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The answer: $250 million

The problem: Answer a question about this article:
Plymouth is often used as a base by visitors to Dartmoor, the Tamar Valley and the beaches of south-east Cornwall. Kingsand, Cawsand and Whitsand Bay are popular.
Visitors to what region's beaches often stop at Plymouth?
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The answer: south-east Cornwall

The problem: Answer a question about this article:
With a population of 518,000, Hanover is a major centre of Northern Germany and the country's thirteenth largest city. Hanover also hosts annual commercial trade fairs such as the Hanover Fair and the CeBIT. Every year Hanover hosts the Schutzenfest Hannover, the world's largest marksmen's festival, and the Oktoberfest Hannover, the second largest Oktoberfest in the world (beside Oktoberfest of Blumenau). In 2000, Hanover hosted the world fair Expo 2000. The Hanover fairground, due to numerous extensions, especially for the Expo 2000, is the largest in the world. Hanover is of national importance because of its universities and medical school, its international airport and its large zoo. The city is also a major crossing point of railway lines and highways (Autobahnen), connecting European main lines in both the east-west (BerlinRuhr area) and north-south (HamburgMunich, etc.) directions.
What is Hanover's population?
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The answer:
518,000