Here is a question about this article: To be considered 'enriched', the uranium-235 fraction should be between 3% and 5%. This process produces huge quantities of uranium that is depleted of uranium-235 and with a correspondingly increased fraction of uranium-238, called depleted uranium or 'DU'. To be considered 'depleted', the uranium-235 isotope concentration should be no more than 0.3%. The price of uranium has risen since 2001, so enrichment tailings containing more than 0.35% uranium-235 are being considered for re-enrichment, driving the price of depleted uranium hexafluoride above $130 per kilogram in July 2007 from $5 in 2001.
What is the answer to this question: In what year did the cost of uranium notably begin to increase?
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So... 2001

Here is a question about this article: The world's first Institute of Technology the Berg-Schola (Bergschule) established in Selmecbanya, Kingdom of Hungary by the Court Chamber of Vienna in 1735 providing Further education to train specialists of precious metal and copper mining. In 1762 the institute ranked up to be Academia providing Higher Education courses. After the Treaty of Trianon the institute had to be moved to Sopron.
What is the answer to this question: Who established the Berg-Schola?
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So... Court Chamber of Vienna

Here is a question about this article: The first task of a database designer is to produce a conceptual data model that reflects the structure of the information to be held in the database. A common approach to this is to develop an entity-relationship model, often with the aid of drawing tools. Another popular approach is the Unified Modeling Language. A successful data model will accurately reflect the possible state of the external world being modeled: for example, if people can have more than one phone number, it will allow this information to be captured. Designing a good conceptual data model requires a good understanding of the application domain; it typically involves asking deep questions about the things of interest to an organisation, like "can a customer also be a supplier?", or "if a product is sold with two different forms of packaging, are those the same product or different products?", or "if a plane flies from New York to Dubai via Frankfurt, is that one flight or two (or maybe even three)?". The answers to these questions establish definitions of the terminology used for entities (customers, products, flights, flight segments) and their relationships and attributes.
What is the answer to this question: What must one understand in order to create a successful data model?
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So...
the application domain