The problem: Answer a question about this article:
Apart from its use as a reactant, H
2 has wide applications in physics and engineering. It is used as a shielding gas in welding methods such as atomic hydrogen welding. H2 is used as the rotor coolant in electrical generators at power stations, because it has the highest thermal conductivity of any gas. Liquid H2 is used in cryogenic research, including superconductivity studies. Because H
2 is lighter than air, having a little more than 1⁄14 of the density of air, it was once widely used as a lifting gas in balloons and airships.
Why is it used as the rotor coolant?
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The answer: it has the highest thermal conductivity of any gas


The problem: Answer a question about this article:
Public institutions of higher education in Charleston include the College of Charleston (the nation's 13th-oldest university), The Citadel, The Military College of South Carolina, and the Medical University of South Carolina. The city is also home to private universities, including the Charleston School of Law . Charleston is also home to the Roper Hospital School of Practical Nursing, and the city has a downtown satellite campus for the region's technical school, Trident Technical College. Charleston is also the location for the only college in the country that offers bachelor's degrees in the building arts, The American College of the Building Arts. The Art Institute of Charleston, located downtown on North Market Street, opened in 2007.
Where is the Art Institute of Charleston located?
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The answer: downtown on North Market Street


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Asthma is the result of chronic inflammation of the conducting zone of the airways (most especially the bronchi and bronchioles), which subsequently results in increased contractability of the surrounding smooth muscles. This among other factors leads to bouts of narrowing of the airway and the classic symptoms of wheezing. The narrowing is typically reversible with or without treatment. Occasionally the airways themselves change. Typical changes in the airways include an increase in eosinophils and thickening of the lamina reticularis. Chronically the airways' smooth muscle may increase in size along with an increase in the numbers of mucous glands. Other cell types involved include: T lymphocytes, macrophages, and neutrophils. There may also be involvement of other components of the immune system including: cytokines, chemokines, histamine, and leukotrienes among others.
What other cell types are involced with the changing of airways?
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The answer: T lymphocytes, macrophages, and neutrophils


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In the 2005–06 season, Barcelona repeated their league and Supercup successes. The pinnacle of the league season arrived at the Santiago Bernabéu Stadium in a 3–0 win over Real Madrid. It was Frank Rijkaard's second victory at the Bernabéu, making him the first Barcelona manager to win there twice. Ronaldinho's performance was so impressive that after his second goal, which was Barcelona's third, some Real Madrid fans gave him a standing ovation. In the Champions League, Barcelona beat the English club Arsenal in the final. Trailing 1–0 to a 10-man Arsenal and with less than 15 minutes remaining, they came back to win 2–1, with substitute Henrik Larsson, in his final appearance for the club, setting up goals for Samuel Eto'o and fellow substitute Juliano Belletti, for the club's first European Cup victory in 14 years.
What team did Barcelona defeat to win the Champions League trophy?
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The answer:
Arsenal